Publications

Publications du LECD sur son site HAL

• [hal-01704484] Le nouveau-né, un partenaire pour sa mère. Analyse du discours maternel

  8 février 2018

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• [hal-03235566] Quel développement psychomoteur et social des bébés en Maison d’Accompagnement Parents Enfants (MAPE) ? Une question partagée des MAPE et de la pédopsychiatrie périnatale

  22 juillet 2024

  Quel développement psychomoteur et social des bébés en Maison d'Accompagnement Parents Enfants (MAPE) ? Une question partagée des MAPE et de la pédopsychiatrie périnatale What psychomotor and social development of babies in the parent and childcare center? A shared question of parent and childcare centers and perinatal child psychiatry
• [hal-04246761] Langage adressé au bébé et exploration visuelle chez le bébé de 4,5mois : mise en évidence d’un effet de genre

  17 octobre 2023

  Background & aim. – Infant directed speech (IDS) is a simplified form of language known to capture infant visual attention. IDS is an early form of communication to which infants are particularly sensitive beginning at birth and play an essential part in the acquisition of language and in the development of social cognition. The present research aims at determining whether an infant as young as 4.5 months explores different face zones of a person talking to her when the form of speech employed is either IDS or adult directed speech (ADS). We wish to bring more insight in the relation between the way an adult talks to an infant and the infant’s visual attention, such a relation being a central tenet to understanding early interactions. Methods. – Eighteen 4.5 month-old infants were presented videos of a woman talking either IDS or ADS, each video played with and without soundtrack. The total time focused respectively on eye areas and mouth area was collected with an eye-tracking system (Tobii 2150). Results and conclusion. – Results showed evidence of more visual exploration when the soundtrack was played as opposed to silence while exploration focused more on the eye area. Moreover, interaction effects were observed involving a gender effect. These results raise the question of the importance of infant’s gaze and attention directed to the face, and specifically to the eyes of the partner. Indeed, eyes of a talking face seem of great importance at 4.5 months of age, i.e., long before an infant is known to be able to interpret a referential gaze. Our results also add to the gender effect differences found in early interactions between infant and social partners. A better understanding of what infant attention focuses on in a communication-oriented situation, including infant gender impact, would not only help to detect early parent-infant communication distortions but add to a more adapted and efficient clinical follow-up.
• [hal-05249036] Evaluation of the Factorial Structures of the Canine Behavioral Assessment and Research Questionnaire (C-BARQ) in France

  10 septembre 2025

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• [hal-04462688] Foreign-local microdialect discrimination in a songbird, the black redstart

  16 février 2024

  Dialects have been described as geographical variations of vocal signals in several taxa such as humans, cetaceans, bats and birds. Many playback studies have focused on dialect perception by territorial birds, mainly reporting a stronger aggressiveness towards local dialects in comparison to foreign ones. However, exploration of the influence of several methodological factors is lacking, and very few studies have focused on species displaying microdialects (covering distances under 2 km). We investigated these issues in a migratory population of a territorial songbird, the black redstart, Phoenicurus ochruros. In this species only males sing to defend their territories, and their distribution leads to several small groups of neighbours with a relatively high level of song sharing within each group. Using a playback experiment, we tested whether males were able to discriminate between the local and a foreign microdialect, while testing for the effects of their age class, the initial distance to the speaker, the relative acoustic similarity between the playback songs and songs of the tested birds and the order of the stimuli. We broadcast two acoustic stimuli (foreign and local microdialect) from unfamiliar individuals to 26 territorial males, during two breeding seasons. In line with our predictions, males showed a stronger response towards the local microdialect, spending more time in proximity to the speaker, in agreement with the escalation chain of aggression. Our results conformed to the previously reported trend in wide-spanning dialect species. We also showed that both the vocal response and the approach behaviours were influenced by the distance of tested males from the speaker at the beginning of the experiment. Males that were further from the sound source tended to sing rather than approach. More studies are needed to get a better understanding of discrimination abilities and their functions in microdialect species.
• [hal-05200672] Assessing flexibility in meaning and context in non‐human communication

  5 août 2025

  The concept of flexibility in communication is central to reconstructing the evolutionary history of language, and grappling with “contextual flexibility” in particular is pivotal to address implications for pragmatics‐first accounts of language evolution. Despite significant advances in the field, research is hindered by definitional inconsistencies and methodological gaps across modalities. We build on recent frameworks to propose further, detailed methods for studying contextual and functional variability, incorporating modality‐agnostic and standardised terminology to facilitate cross‐species comparisons. Our approach includes a detailed classification of communicative contexts and outcomes, offering practical methods to disentangle context from function and meaning. By integrating insights across behavioural ecology and comparative psychology, we aim to enhance the comparability of findings and provide a robust foundation for exploring the evolutionary trajectory of communicative flexibility and pragmatics.
• [hal-05240651] Association Between Parental Social Position and Childhood Overweight: Mediation by Lifestyle and BMI Patterns During Pregnancy

  4 septembre 2025

  In high-income countries, children born to parents with low socio-economic position (SEP) or with non-Western ethnicity are disproportionally affected by obesity as early as preschool age. We assessed how much of these associations were mediated by parental lifestyle and BMI patterns during pregnancy. We characterised 5-6 years old children with or without overweight from the French Etude Longitudinale Française depuis l'Enfance (ELFE) (n = 8584) and the Dutch Generation R birth cohorts (n = 6511). We used counterfactual mediation analyses to assess the potential mediating effect of previously identified lifestyle patterns: "high parental smoking, poor-quality maternal diet and sedentary behaviour" and "high parental body mass index and low gestational weight gain". Both patterns jointly mediated 62.8% of the association between parents' education level and childhood overweight in ELFE and 23.2% in Generation R. In Generation R, they jointly mediated 8.9% of the association between parents' geographic origin and childhood overweight. In ELFE, parents with non-Western backgrounds were less likely to follow the first pattern, resulting in a negative indirect effect. Parental lifestyle and BMI patterns during pregnancy seem key contributors to the early development of socio-economic inequalities in childhood overweight, while other yet unidentified factors may contribute to inequalities related to geographic origin. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
• [hal-04498355] Social patterning of childhood overweight in the French national ELFE cohort

  11 mars 2024

  Abstract An inverse social gradient in early childhood overweight has been consistently described in high-income countries; however, less is known about the role of migration status. We studied the social patterning of overweight in preschool children according to the mother’s socio-economic and migration background. For 9250 children of the French ELFE birth cohort with body mass index collected at age 3.5 years, we used nested logistic regression to investigate the association of overweight status in children with maternal educational level, occupation, household income and migration status. Overall, 8.3% (95%CI [7.7–9.0]) of children were classified as overweight. The odds of overweight was increased for children from immigrant mothers (OR 2.22 [95% CI 1.75–2.78]) and descendants of immigrant mothers (OR 1.35 [1.04–2.78]) versus non-immigrant mothers. The highest odds of overweight was also observed in children whose mothers had low education, were unemployed or students, or were from households in the lowest income quintile. Our findings confirm that socio-economic disadvantage and migration status are risk factors for childhood overweight. However, the social patterning of overweight did not apply uniformly to all variables. These new and comprehensive insights should inform future public health interventions aimed at tackling social inequalities in childhood overweight.
• [hal-01244841] Sex Differences in Language Across Early Childhood: Family Socioeconomic Status does not Impact Boys and Girls Equally

  17 décembre 2015

  Child sex and family socioeconomic status (SES) have been repeatedly identified as a source of inter-individual variation in language development; yet their interactions have rarely been explored. While sex differences are the focus of a renewed interest concerning emerging language skills, data remain scarce and are not consistent across preschool years. The questions of whether family SES impacts boys and girls equally, as well as of the consistency of these differences throughout early childhood, remain open. We evaluated consistency of sex differences across SES and age by focusing on how children (N = 262), from 2;6 to 6;4 years old, from two contrasting social backgrounds, acquire a frequent phonological alternation in French – the liaison. By using a picture naming task eliciting the production of obligatory liaisons, we found evidence of sex differences over the preschool years in low-SES children, but not between high-SES boys and girls whose performances were very similar. Low-SES boys' performances were the poorest whereas low-SES girls' performances were intermediate, that is, lower than those of high-SES children of both sexes but higher than those of low-SES boys. Although all children's mastery of obligatory liaisons progressed with age, our findings showed a significant impeding effect of low-SES, especially for boys.
• [hal-04681106] Outil numérique innovant à destination des jeunes S/sourds et des jeunes malentendants (ONISE) : un questionnaire en ligne sur leur épanouissement relationnel

  13 septembre 2024

  L’objectif de cette étude transversale est d’investiguer l’épanouissement relationnel de jeunes S/sourds et de jeunes malentendants français au sortir de l’adolescence. Compte tenu de l’inexistence d’un outil adapté et accessible pour recueillir l’avis de ces jeunes, le préalable à cet objectif a été la construction d’un auto-questionnaire en ligne, élaboré dans le cadre d’un appel à projet. Pour le recueil des données, nous avons eu recours au questionnaire en ligne, à des observations participantes en établissements pour les S/sourds, de même qu’à des focus groupes de jeunes sourds et de jeunes malentendants dans ces établissements. Les résultats obtenus sur 40 jeunes, âgés de 18 à 25 ans, montrent que leur épanouissement relationnel en termes de qualité de vie, de participation sociale et d’humeur dépressive n’est pas très éloigné de l’épanouissement relationnel d’autres jeunes S/sourds d’origine différente ou de jeunes français entendants. L’accessibilité de l’outil est globalement satisfaisante même si les observations et les analyses des échanges issus des focus groupes mettent en évidence des difficultés d’accès à certaines questions.
• [hal-02543956] Differences in auditory and physiological properties of HVc neurons between reproductively active male and female canaries ( Serinus canaria )

  15 avril 2020

  Based on neuronal recordings in the HVc, this study investigated differences between reproductively active male and sexually receptive female canaries. It is the first study to describe auditory responses and cell characteristics of HVc neurons in female songbirds and to compare them with the responses and characteristics obtained in males. Extracellular single unit recordings showed that in males HVc cells exhibited two types of auditory responses to conspecific and heterospecific song playbacks: tonic and phasic responses. The major finding of the present study is the absence of tonic responses in females. Neurons in the HVc of females only responded phasically to song playbacks. In both sexes, neurons exhibiting auditory responses had thinner action potentials than the others. As all the tonic cells recorded in males were thin spike cells (action potential < or = 0.6 ms) [corrected] and had high firing rates (6 Hz in average), they are potentially interneurons. In both sexes, two categories of nonresponsive cells were found: neurons that did not fire at song onset and had the lowest spontaneous firing rate; and neurons that did not exhibit changes in activity in response to song playbacks. Analyses of physiological characteristics of HVc neurons revealed that the rate of spontaneous activity was higher in males than in females. This study is a first step towards identifying [corrected] the cellular bases of the sexual dimorphism in HVc function and highlights the pivotal role of interneurons in HVc auditory processing.
• [hal-04389963] Can Infants Generalize Tool Use From Spoon to Rake at 18 Months?

  12 janvier 2024

  Infants start to use a spoon for self-feeding at the end of the first year of life, but usually do not use unfamiliar tools to solve problems before the age of 2 years. We investigated to what extent 18-month-old infants who are familiar with using a spoon for self-feeding are able to generalize this tool-use ability to retrieve a distant object. We tested 46 infants with different retrieval tasks, varying the tool (rake or spoon) and the target (toy or food). The tasks were presented in a priori descending order of difficulty: rake–toy condition, then either spoon–toy or rake–food, and finally spoon–food. Then, the same conditions were presented in reverse order to assess the transfer abilities from the easiest condition to the most difficult retrieval task. Spontaneously, 18-month-old infants performed the retrieval tasks better with the familiar tool, the easiest task being when the spoon was associated with food. Moreover, the transfer results show that being able to use a familiar tool in an unusual context seems necessary and sufficient for subsequent transfer to an unfamiliar tool in the unusual context, and that early and repetitive training of self-feeding with a spoon plays a positive role in later tool use.
• [hal-00087299] Estimating the complexity of bird song by using capture-recapture approaches from community ecology

  21 juillet 2006

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• [hal-01101807] Assessing vocal performance in complex birdsong: a novel approach

  9 janvier 2015

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• [hal-00325423] Female canary mate preferences: differential use of information from two types of male-male interaction

  29 septembre 2008

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• [hal-01480086] Sociality Enhances Birds' Capacity to Deal with Anthropogenic Ecosystems

  1 mars 2017

  Urban species often adjust their behavior to survive in urban environments, characterized by the proximity of humans, habitat fragmentation and heterogeneous, fluctuating ecological resources. Several hypotheses have been put forth to explain how species manage living in heterogeneous and complex anthropogenic habitats. The ability of individuals or species to beneficially modify their behaviors in response to changes in the environment has indeed been alternatively explained based on phylogenetic, adaptive, and ontogenic arguments. In this study we investigated the role of sociality as a driver of behavioural flexibility in urban birds. Sociality can be defined as the tendency to associate with conspecifics or form a group and may influence a species' ability to survive in an urban ecosystem to the extent that it represents advantages to species or individuals in terms of resource exploitation, fitness, and predation risk-avoidance. Given the potential benefits of sociality we hypothesized that sociality is a further characteristic that may explain how species have successfully expanded their range into urbanized areas. Based on this hypothesis, we predicted that pigeons (Columba livia) will show higher behavioural flexibility when in larger groups, whatever their genetic background and living-circumstances. Using pigeons as a model system, we compared 27 groups in France and Italy composed of four different genetic strains and varying living-conditions: free-living feral pigeons in urban areas, free-living domestic pigeons at the property of a local breeder captive, feral pigeons in a French ecological field station, captive domestic pigeons in an Italian ecological station. We tested two standardized behavioral measures of behavioural flexibility: thresholds for fear or neophobia and rates of problem solving. We found that group number affects neophobia and to a lesser extent problem-solving, suggesting that sociality is a factor enhancing birds' faculties to establish in and cope with heterogeneous urban environments. We consider this hypothesis here as compatible and complementary to existing hypotheses on species' adaptation to urban ecosystems.
• [hal-04767165] Is That You I Hear? Speaker Familiarity Modulates Neural Signatures of Lexical-semantic Activation in 18-month-old Infants

  5 novembre 2024

  Abstract Developmental language studies have shown that lexical-semantic organization develops between 18 and 24 months of age in monolingual infants. In the present study, we aimed to examine whether voice familiarity facilitates lexical-semantic activation in the infant brain. We recorded the brain activity of 18-month-old, French-learning infants using EEG while they listened to taxonomically related and unrelated spoken word pairs by one voice with which they were familiarized with before the experiment, and one voice with which they were not familiarized. The ERPs were measured in response to related and unrelated target words. Our results showed an N400 effect (greater amplitudes for unrelated as opposed to related target words) over the left hemisphere, only for the familiar voice, suggesting that the voice familiarity facilitated lexical-semantic activation. For unfamiliar voices, we observed an earlier congruence effect (greater amplitudes for related than for unrelated target words). This suggests that although 18-month-olds process lexical-semantic information from unfamiliar speakers, their neural signatures of lexical-semantic processing are less mature. Our results show that even in the absence of personal relation with a speaker, familiarity with a voice augments infant lexical-semantic processing. This supports the idea that extralinguistic information plays a role in infant lexical-semantic activation.
• [hal-01702136] Heaven It's My Wife! Male Canaries Conceal Extra-Pair Courtships but Increase Aggressions When Their Mate Watches

  6 février 2018

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• [hal-04532112] Working with dogs in olfactory searches in the French Armed Forces and national Police Forces

  4 avril 2024

  This study aims to investigate the relationships and cooperation within human-dog teams working in olfactory search in the French Armed Forces and in national Police Forces. Twenty-six semi-structured interviews were carried out with canine handlers. The main topic concerned working with their dog during olfactory searches. Among the themes that stand out are relationships with their dog and canine knowledge and practices. Minor differences and similarities between dyads of the two institutions are identified in human-dog relationships. Regarding relationships with dogs, two main differences are linked to the long missions abroad experienced by Armed Forces handlers and the possibility of welcoming dogs into their homes for Police Forces. The constitution of canine knowledge and practices is rooted in experiences and transactions with dogs, but also in social transmission. Even though there is no major differences between the two institutions, this study highlights the interest of having a situated approach.
• [hal-04672457] Human-dog trust and cohesion within French military canine teams

  19 août 2024

  Studies on the relationships and interactions within human-dog teams in the French Army are scarce. In order to better understand this subject, a qualitative exploratory study was undertaken by conducting semi-structured interviews with dog handlers (n = 16). The interviewees work in the French Army. They are specialized in the detection and neutralization of individuals or explosives. Thematic analysis identified different themes: trust within the team, doubts, interspecific cohesion, and care provided to the dogs. The results highlight the importance of trust within the canine team. It is conceived as a dynamic, constructed process, based on experience, and involving both members of the team. It emerges that trust arises from individual, relational, technical, and experiential factors: the bonds formed, knowledge of one’s dog, difficulties related to technical aspects, the reliability of the dog following training, and mission successes. Kindness, support, and mutual protection are also important criteria. A form of interspecific cohesion is envisaged by experienced handlers when affection, knowledge, reliability, mutual assistance, and support are present.
• [hal-03177576] Auditory perception of self and others in zebra finches: evidence from an operant discrimination task

  3 juillet 2025

  Vocal communication is essential for social interactions in many animal species. For this purpose, an animal has to perceive vocal signals of conspecifics and is often also required to discriminate conspecifics. The capacity to discriminate conspecifics is particularly important in social species in which individuals interact repeatedly. In addition, auditory perception of self plays an important role for vocal learners. A vocal learner has to memorise vocalisations of conspecifics and to subsequently modify its own vocalisations in order to match the memorised vocalisations. Here, we investigated auditory perception of self and others in zebra finches (Taeniopygia guttata), a highly gregarious songbird species and vocal learner. We used laboratory colonies in which founder males had been previously trained to produce the same song type. This resulted in artificial dialects in the song of founders and their offspring. We investigated whether those birds would be able to discriminate between familiar and unfamiliar conspecifics based on song. Furthermore, we examined whether they would classify their own song as familiar or unfamiliar. We found that birds were able to discriminate between songs of familiar versus unfamiliar conspecifics, despite the fact that all songs were imitations of the same song type. This suggests that such discrimination is possible even based on songs with a high acoustic similarity. None of the subjects classified their own song as unfamiliar. Three out of eight males classified their own song as familiar. Thus zebra finches might recognise their own song. Further experiments are needed to confirm such self-recognition.
• [hal-01682389] Exposure to human voices has beneficial effects on preterm infants in the neonatal intensive care unit

  12 janvier 2018

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• [hal-04931213] Ségrégation de sexe et socialisation entre élèves de collège au Cameroun. Filles et garçons à part mais en accord sur la répartition des rôles sexués.

  5 février 2025

  Le premier objectif était de savoir si à l’adolescence les relations entre élèves camerounais étaient marquées par la ségrégation de sexe. Le deuxième consistait à analyser dans quelle mesure les réputations de dominance et de prosocialité rendaient compte de l’acceptation sociale. 358 élèves de collège ont répondu à un questionnaire. Devant citer leurs préférés, ils ont choisi majoritairement des condisciples de leur sexe. Chez les filles les réputations de prosocialité et de dominance contribuent à l’acceptation sociale, chez les garçons seule leur réputation de prosocialité y contribue. On obtient les mêmes résultats en se centrant sur les citations provenant des pairs de même sexe. Ces résultats sont interprétés dans le contexte des rôles sexués au Cameroun.
• [hal-04931960] Adolescents' sociosexual orientation is related to attachment to their same-sex parent

  6 février 2025

  We set out to show that sociosexual orientation (SSO) and erotophilia are two different traits that can be evidenced as early as middle adolescence, and to examine their associations with attachment to parents. Self-report scales measuring SSO, erotophilia, and attachment to the mother and the father were administered to 289 12- to 17-year-olds. Based on an exploratory factor analysis, SSO and erotophilia are two different, consistent dimensions in this age range. A six-month test-retest revealed a moderate-to-high rank-order stability of the two traits, which were positively and moderately correlated. Boys scored higher than girls on both traits. During the six-month interval between T1 and T2, erotophilia increased whereas SSO did not change. Regression analyses showed that a positive perception of attachment to the same-sex parent among boys accounted for SSO, regardless of perceived attachment to the other-sex parent. This held true for girls also, but to a lesser extent. In the discussion, we emphasize the differences between boys' and girls' mating behavior, and the differences between attachment to same-sex vs other-sex parents as possible influences on SSO.
• [hal-01478434] Variation in Reproductive Success Across Captive Populations: Methodological Differences, Potential Biases and Opportunities

  28 février 2017

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• [hal-01478453] Climat scolaire, problèmes de comportement et résultats scolaires des élèves : une analyse multi-niveaux

  28 février 2017

  à venir
• [hal-02450781] Sensus Communis: Some Perspectives on the Origins of Non-synchronous Cross-Sensory Associations

  2 décembre 2024

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• [hal-01681237] Tool selection during foraging in two species of funnel ants

  29 décembre 2023

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• [hal-01478446] Do Tonkean Macaques (Macaca Tonkeana) Tailor Their Gestural and Visual Signals to Fit the Attentional States of a Human Partner?

  28 février 2017

  Pourquoi les femmes sont-elles sujettes à la ménopause ? Cette question reste en grande partie mystérieuse. Logiquement, les mécanismes biologiques de l'évolution font en sorte que les invididus ne vivent guère longtemps au-delà de leur période de procréation. La ménopause est ainsi rarissime, et ne se produit que dans l'espèce humaine, ainsi que chez deux cétacés : l'orque et le globicéphale. Ce qui a poussé les biologistes à s'intéresser aux orques, dans le but de comprendre pourquoi leurs femelles sont ménopausées. Des observations nouvelles viennent ainsi d'être réalisées et publiées par une équipe de chercheurs de l'Université d'Exeter en Grande-Bretagne associée à des spécialistes des baleines de l'État de Washington, aux États-Unis. Ces observations pourraient expliquer pourquoi les femelles de rares espèces (dont la nôtre) ont une durée de vie largement supérieure à leur période de reproduction. Les orques vivent en troupes d'une quinzaine d'individus unis par des liens sociaux riches et complexes. Remarquablement intelligentes, parfois qualifiées de « baleines tueuses », les femelles âgées tiennent une place particulière que l'on peut observer dans des scènes typiques de la vie de ces animaux, où une orque conduit par exemple ses fils et ses filles, déjà d'âge adulte, vers un banc de saumons. Les jeunes adultes, parfaitement capables de chasser, se laissent mener sur la trajectoire du banc de poissons, dont ils semblent ignorer l'emplacement exact.
• [hal-01478451] Intentional Gestural Communication and Discrimination of Human Attentional States in Rhesus Macaques (Macaca Mulatta)

  28 février 2017

  Pourquoi les femmes sont-elles sujettes à la ménopause ? Cette question reste en grande partie mystérieuse. Logiquement, les mécanismes biologiques de l'évolution font en sorte que les invididus ne vivent guère longtemps au-delà de leur période de procréation. La ménopause est ainsi rarissime, et ne se produit que dans l'espèce humaine, ainsi que chez deux cétacés : l'orque et le globicéphale. Ce qui a poussé les biologistes à s'intéresser aux orques, dans le but de comprendre pourquoi leurs femelles sont ménopausées. Des observations nouvelles viennent ainsi d'être réalisées et publiées par une équipe de chercheurs de l'Université d'Exeter en Grande-Bretagne associée à des spécialistes des baleines de l'État de Washington, aux États-Unis. Ces observations pourraient expliquer pourquoi les femelles de rares espèces (dont la nôtre) ont une durée de vie largement supérieure à leur période de reproduction. Les orques vivent en troupes d'une quinzaine d'individus unis par des liens sociaux riches et complexes. Remarquablement intelligentes, parfois qualifiées de « baleines tueuses », les femelles âgées tiennent une place particulière que l'on peut observer dans des scènes typiques de la vie de ces animaux, où une orque conduit par exemple ses fils et ses filles, déjà d'âge adulte, vers un banc de saumons. Les jeunes adultes, parfaitement capables de chasser, se laissent mener sur la trajectoire du banc de poissons, dont ils semblent ignorer l'emplacement exact. Tout se passe comme si la...
• [hal-01478471] A Potential Role for Parasites in the Maintenance of Color Polymorphism in Urban Birds

  28 février 2017

  Urbanization is a major challenge for biodiversity conservation, yet the evolutionary processes taking place in urbanized areas remain poorly known. Human activities in cities set new selective forces in motion which need to be investigated to predict the evolutionary responses of animal species living in urban areas. In this study, we investigated the role of urbanization and parasites in the maintenance of melanin-based color polymorphism in the feral pigeon Columba livia. Using a correlative approach, we tested whether differently colored genotypes displayed alternative phenotypic responses to urbanization, by comparing body condition, blood parasite prevalence and parasite load between colored morphs along an urbanization gradient. Body condition did not vary with urbanization, but paler individuals had a higher body condition than darker individuals. Moreover, paler morphs were less often parasitized than darker morphs in moderately urbanized habitats, but their parasite prevalence increased with urbanization. In contrast, darker morphs had similar parasite prevalence along the urbanization gradient. This suggests that paler morphs did better than darker morphs in moderately urbanized environments but were negatively affected by increasing urbanization, while darker morphs performed equally in all environments. Thus, differently colored individuals were distributed non-randomly across the urban habitat and suffered different parasite risk according to their location (a gene-by-environment interaction). This suggests that melanin-based coloration might reflect alternative strategies to cope with urbanization via different exposure or susceptibility to parasites. Spatial variability of parasite pressures linked with urbanization may, thus, play a central role in the maintenance of plumage color polymorphism in this urban species.
• [hal-03352104] Parental Perception of Vocal Contact with Preterm Infants: Communicative Musicality in the Neonatal Intensive Care Unit.

  23 septembre 2021

  In this study, we evaluate mothers' subjective experience of speaking and singing to their infants while they are in their incubators. We also discuss the relevance of the theoretical framework of Communicative Musicality for identifying the underlying mechanisms that may help explain its beneficial effects, both for parents and infants. Nineteen mothers talked and sung to their stable preterm infants in the incubators, for 5 min each, in three sessions over a period of 6 days. After each session, mothers were asked to assess in a self-report questionnaire the ease and the effectiveness of addressing their infants by speaking and singing and their prior musical experience. Perceived ease and effectiveness in communication were found to increase progressively from one session to the next. Mothers rated the speech to be increasingly more effective. This intuitive mean of interaction between parents and infants could be encouraged and supported by the nurses and the medical staff. Furthermore, individual musical experience affects perceived ease of communicating vocally with infants after a premature birth and should thus be encouraged during pregnancy.
• [hal-01699823] Pet-directed speech draws adult dogs’ attention more efficiently than Adult-directed speech

  2 février 2018

  Humans speak to dogs using a special speech register called Pet-Directed Speech (PDS) which is very similar to Infant-Directed Speech (IDS) used by parents when talking to young infants. These two type of speech share prosodic features that are distinct from the typical Adult-Directed Speech (ADS): a high pitched voice and an increased pitch variation. So far, only one study has investigated the effect of PDS on dogs' attention. We video recorded 44 adult pet dogs and 19 puppies when listening to the same phrase enounced either in ADS or in PDS or in IDS. The phrases were previously recorded and were broadcasted via a loudspeaker placed in front of the dog. The total gaze duration of the dogs toward the loudspeaker, was used as a proxy of attention. Results show that adult dogs are significantly more attentive to PDS than to ADS and that their attention significantly increases along with the rise of the fundamental frequency of human' speech. It is likely that the exaggerated prosody of PDS is used by owners as an ostensive cue for dogs that facilitates the effectiveness of their communication, and should represent an evolutionarily determined adaptation that benefits the regulation and maintenance of their relationships. Humans speak to dogs using a special speech register called pet-directed speech (PDS) 1–4 , which is very similar to infant-directed speech (IDS) used by parents when talking to young infants. These two types of speech share prosodic and syntactic features that are distinct from the typical adult-directed speech (ADS): a high pitched voice, an increased pitch variation, short utterances, a reduced syntactic and semantic complexity, and word repetitions 1–5. PDS and IDS are also commonly described as 'happy voices' , in comparison to ADS presenting a relatively inhibited emotional content 6. Both speeches have been shown to vary according to the interaction context 7–9 , for instance PDS' prosodic features are enhanced in a positive reunion situation 9. Several studies suggest that IDS is used by humans in order to modulate infants' attention and state of arousal and to communicate their positive affect and intentions in a non-verbal way 10–14. IDS may also facilitate the emergence of language in infants by emphasizing the linguistic structure 15, 16 , for instance by using hyperaticulation of vowels 2, 3, 17 , or words repetition 18. Authors highlighted these functions in studying babies' preference for IDS toward ADS 19, 20 : infants have a longer fixation on, or turn more often the head toward visual targets that produced IDS 19. Infants also better remember and look longer at adults who have addressed them with IDS 20 , and this preference is present when IDS is produced by the infants' own mother as well as by an unfamiliar mother 12, 20. In addition, the exaggerated acoustic features of IDS elicit increased neural activity in infants, related to atten-tional processing 21. Infants also present increased social and affective responsiveness while listening to IDS compared to ADS 19. PDS and IDS may be similar because both infants and dogs are non-verbal listeners and because the affective bond between owners and dogs mirrors the human parents-infant bond. Indeed, both owners and dogs experience an important secretion of oxytocin after a brief period of cuddling 22 and a study highlighted common brain activation when mothers viewed images of both their child and dog 23. In the context of human-dog communication, there is evidence that dogs present an increased neuronal activity in the auditory cortex when listening to vocalizations with positive emotional valence compared to negative or neutral emotional valence 24. Moreover, after a greeting involving eye contact and a high pitched voice, dogs are more likely to follow the humans gaze, similarly to young children do 25, 26. Similarly, dogs are more motivated to answer a command to find hidden food in high-pitched informative than in low-pitched imperative trials 27 , suggesting that they are sensitive to the nonverbal quality of human vocal signals.
• [hal-02685077] Rating and recognition of peers' personal odors by 9-year-old children : an exploratory study

  1 juin 2020

  [...]
• [hal-01478441] Infants' Selectively Pay Attention to the Information They Receive from a Native Speaker of Their Language

  2 décembre 2024

  From the first moments of their life, infants show a preference for their native language, as well as toward speakers with whom they share the same language. This preference appears to have broad consequences in various domains later on, supporting group affiliations and collaborative actions in children. Here, we propose that infants' preference for native speakers of their language also serves a further purpose, specifically allowing them to efficiently acquire culture specific knowledge via social learning. By selectively attending to informants who are native speakers of their language and who probably also share the same cultural background with the infant, young learners can maximize the possibility to acquire cultural knowledge. To test whether infants would preferably attend the information they receive from a speaker of their native language, we familiarized 12-month-old infants with a native and a foreign speaker, and then presented them with movies where each of the speakers silently gazed toward unfamiliar objects. At test, infants' looking behavior to the two objects alone was measured. Results revealed that infants preferred to look longer at the object presented by the native speaker. Strikingly, the effect was replicated also with 5-month-old infants, indicating an early development of such preference. These findings provide evidence that young infants pay more attention to the information presented by a person with whom they share the same language. This selectivity can serve as a basis for efficient social learning by influencing how infants' allocate attention between potential sources of information in their environment.
• [hal-03912933] Comments on “Postures of listening” by Victor A. Stoichita and Bernd Brabec de Mori

  26 décembre 2022

  [...]
• [hal-04484251] Spontaneous tempo production in cockatiels (Nymphicus hollandicus) and jungle crows (Corvus macrorhyncos)

  28 avril 2025

  Musical and rhythmical abilities are poorly documented in non-human animals. Most of the existing studies focused on synchronisation performances to external rhythms. In humans, studies demonstrated that rhythmical processing (e. g. rhythm discrimination or synchronisation to external rhythm) is dependent of an individual measure: the individual tempo. It is assessed by asking participants to produce an endogenous isochronous rhythm (known as spontaneous motor tempo) without any specific instructions nor temporal cue. In non-human animal literature, studies describing spontaneous and endogenous production of motor tempo without any temporal clue are rare. This exploratory study aims to describe and compare the spontaneous motor tempo of cockatiels and jungle crows. Data were collected on spontaneous beak drumming behaviours of birds housed in laboratory. Inter beak strokes intervals were calculated from sound tracks of videos. The analyses revealed that inter beak strokes intervals are non-randomly distributed intervals and are isochronous. Recorded spontaneous motor tempos are significantly different among some cockatiels. Since we could only conduct statistical analysis with one corvid, we cannot conclude about this species. Our results suggest that cockatiels and jungle crows have individual tempos, thus encouraging further investigations.
• [hal-05036469] The impact of humor on infant social learning: Insights from social gaze, heart rate variability, and laughter

  19 avril 2025

  Humor is a universal aspect of human culture, serving both social and cognitive functions. This study investigates humor's influence on infant learning, focusing on physiological, behavioral, and emotional responses. Building on previous research, we examined three questions: (1) Does humor affect infants' behaviors during a social learning task, such as looking, laughing, and smiling? (2) Does humor enhance learning, and is this effect age-dependent? (3) Can arousal, measured by heart rate variability (HRV), explain the relationship between humor and learning? We tested 88 infants aged 14–22 months, exposing them to either a humorous or neutral demonstration of a tool-use task. We assessed infants’ performance after demonstration and coded social gazes and emotional reactions. We also analyzed physiological arousal indicators, namely heart rate variability (HRV), through a connected wristband. Our analyses revealed that infants exposed to humorous demonstrations showed enhanced learning compared to those in the neutral condition, independently of whether they laughed or not. This suggests that laughing does not mediate the effect of humor on learning. Additionally, infants in the humorous condition looked more at the experimenter, which could indicate increased engagement or attentional processes. Finally, our HRV analyses revealed that infants who succeeded in the task exhibited higher HRV than those who did not. This study is the first to explore the mechanisms underlying humor’s effect on infant learning, emphasizing its complexity and the need for a multidimensional approach integrating cognitive, behavioral, and physiological factors.
• [hal-01478445] Soutenir la motivation du tout-petit pour échanger, partager et comprendre son monde

  28 février 2017

  à venir
• [hal-01645056] Spontaneous motor tempo and rhythmical synchronisation in 2½-and 4-year-old children

  22 novembre 2017

  [...]
• [hal-03130944] Sensorimotor Contingencies as a Key Drive of Development: From Babies to Robots

  4 février 2021

  Much current work in robotics focuses on the development of robots capable of autonomous unsupervised learning. An essential prerequisite for such learning to be possible is that the agent should be sensitive to the link between its actions and the consequences of its actions, called sensorimotor contingencies. This sensitivity, and more particularly its role as a key drive of development, has been widely studied by developmental psychologists. However, the results of these studies may not necessarily be accessible or intelligible to roboticians. In this paper, we review the main experimental data demonstrating the role of sensitivity to sensorimotor contingencies in infants’ acquisition of four fundamental motor and cognitive abilities: body knowledge, memory, generalization, and goal-directedness. We relate this data from developmental psychology to work in robotics, highlighting the links between these two domains of research. In the last part of the article we present a blueprint architecture demonstrating how exploitation of sensitivity to sensorimotor contingencies, combined with the notion of “goal,” allows an agent to develop new sensorimotor skills. This architecture can be used to guide the design of specific computational models, and also to possibly envisage new empirical experiments.
• [hal-04353159] Human perception of cats' communicative cues: human-cat communication goes multimodal

  19 décembre 2023

  As a central key to apprehend the human-cat relationship, the question of how humans decode the behaviours expressed by their feline companions has drawn scientists’ attention in the past decades. To this point, previous studies have not investigated humans’ understanding of cats’ communicative cues in a multimodal perspective. While communication generally implies multiple channels, the influence of signal modality as relates to human-cat communication, is still poorly understood. Therefore, the primary aim of the present study was to investigate whether people can identify cats’ communicative information using unimodal (visual or vocal) and bimodal (visual and vocal) signals. Participants (n=630) were recruited via online advertisement on social media. Each participant viewed 24 carefully operationalised video clips of cats in different emotional/behavioural conditions. Four categories were included: contentment, discontentment, solicitation (food or attention) and predatory behaviour. Clips were presented as vocal only, visual only, or bimodal (visual and vocal cues). Video clips showing a bimodal expression were identified with the highest score (91,8% of correct ratings) compared with the visual only (87,3%) and the vocal only (72,2%). All modalities considered, contentment returned the highest identification score (90,1% correct), followed by solicitation (87,2%), then predatory behaviour (86,3%). Discontentment was the most difficult behaviour to be correctly identified (71,6%). Finally, for all behavioural categories and modalities, professionals working with animals returned a higher score than lay people (86.2% vs 82.9%). Taken together, our data underline the influence of the signal modality on interspecific communication between cats and humans. Information emitted by cats as a bimodal signal (visual and vocal) is better understood by humans than visual signals. The most difficult to decipher for humans are vocal signals emitted alone. A better understanding of humans’ abilities to understand their feline counterparts, could potentially help pet owners, and animal care practitioners to optimise cat care and welfare.
• [hal-03861918] How’s my kitty? Acoustic parameters of cat-directed speech in human-cat interactions

  20 novembre 2022

  In Western cultures, humans tend to use a specific kind of speech when talking to their pets, characterised, from an acoustical point of view, by elevated pitch and greater pitch modulation. Pet-directed speech (PDS), which has been mainly studied in dogs, shares some acoustic features with infant-directed speech (IDS), used when talking to young children. The purpose of this study was to test the hypothesis that adult humans also modify characteristics of their voice when talking to a cat. We compared acoustic parameters of speech directed to cats (CDS) and speech directed to adult humans (ADS). In a first experiment, we compared ADS and CDS utterances of male and female participants, addressing cats through video recordings, under controlled laboratory conditions. Both men and women used a higher pitch (mean fundamental frequency, or mean F0) in CDS vs. ADS. The second experiment was conducted under conditions allowing direct cat-human interactions, in a cohort of women. Once again, mean F0 was significantly higher in CDS vs. ADS. Overall, these data confirm our hypothesis that humans change the way they speak when addressing a cat, mainly by increasing the pitch of their voice. Further research is needed to fully investigate specificities of this speech.
• [hal-04035254] Preadolescents' Recognition of Faces of Unfamiliar Peers: The Effect of Attractiveness of Faces

  17 mars 2023

  The authors examined preadolescents' ability to recognize faces of unfamiliar peers according to their attractiveness. They hypothesized that highly attractive faces would be less accurately recognized than moderately attractive faces because the former are more typical. In Experiment 1, 106 participants (M age =10 years) were asked to recognize faces of unknown peers who varied in gender and attractiveness (high- vs. medium-attractiveness). Results showed that attractiveness enhanced the accuracy of recognition for boys' faces and impaired recognition of girls' faces. The same interaction was found in Experiment 2, in which 92 participants (M age =12 years) were tested for their recognition of another set effaces of unfamiliar peers. The authors conducted Experiment 3 to examine whether the reason for that interaction is that high- and medium-attractive girls' faces differ more in typicality than do boys' faces. The effect size of attractiveness on typicality was similar for boys' and girls' faces. The overall results are discussed with reference to the development of face encoding and biological gender differences with respect to the typicality of faces during preadolescence.
• [hal-03636219] Comment les adolescents perçoivent-ils la relation avec leur camarade préféré(e) ?

  9 avril 2022

  Le premier objectif de cette recherche était d’apporter un soutien empirique à un modèle tridimensionnel de la perception qu’ont les adolescents de la relation avec leur camarade de classe préféré. Les trois dimensions étaient : l’attachement émotionnel au camarade, le sentiment qu’il serait prêt à apporter son aide pour réussir une activité scolaire, et le fait de s’attendre à ce qu’il offre son soutien en cas d’agression par d’autres élèves. Le deuxième objectif était de tester des hypothèses concernant les facteurs de variation de cette perception. Dans le cadre d’une enquête nationale, un échantillon représentatif des élèves français en classe de 3ème, âgés en moyenne de 15 ans et 4 mois, a répondu à un questionnaire destiné à évaluer cette perception. Une analyse factorielle confirmatoire (AFC) indique que le modèle tridimensionnel est bien ajusté aux réponses des élèves. Les trois sous-échelles sont positivement mais modérément inter-corrélées. Une analyse multivariée de la variance a révélé que la relation avec le camarade de classe préféré est mieux perçue par les filles que par les garçons, qu’elle est évaluée à un niveau plus élevé lorsque ce camarade est le meilleur ami en dehors du collège et aussi lorsque cette préférence n’est pas trop récente.
• [hal-04424300] Adolescent educational and occupational anxiety: A three-dimensional model to fit into an attachment framework

  10 juillet 2024

  We propose a model of the anxiety adolescents experience about their educational and occupational future that includes three topics they worry about: (a) career failure, (b) parental disappointment, and (c) separation from loved ones to achieve one’s career. A total of 16,663 15-year-old French participants filled out a new anxiety questionnaire and other self-reports. Factor analyses showed that all three topics belong to the same type of anxiety, and suggested that the adolescents’ fear about their career is closely interwoven with parental attachment. This new kind of anxiety varied across gender and was correlated with school-adjustment and personality variables.
• [hal-03509852] The emotions aroused by a vocational transition in adolescents: why, when and how are they socially shared with significant others?

  6 janvier 2022

  [...]
• [hal-03636218] Les peurs des adolescents concernant leur avenir scolaire et professionnel : structure et variations selon le niveau scolaire, le sexe et la classe sociale

  9 avril 2022

  Les peurs des adolescents concernant leur avenir scolaire et professionnel 2 Les peurs des adolescents concernant leur avenir scolaire et professionnel : structure et variations selon le niveau scolaire, le sexe et la classe sociale. Résumé : La présente recherche vise à valider auprès d'adolescents un nouveau construit psychologique : l'anxiété suscitée par l'avenir scolaire et professionnel. Les résultats suggèrent que ce motif général d'anxiété se décline en trois motifs spécifiques : la peur d'échouer, la peur de décevoir ses parents, et la peur de s'éloigner de ses autruis significatifs, dans le cadre de ses parcours scolaire et professionnel. La force de ces motifs d'anxiété présente des différences significatives selon la classe sociale, le sexe et les performances scolaires. Les analyses de régression multiple révèlent que les différences persistent en dépit du contrôle du niveau scolaire. Cette anxiété peut être interprétée comme une composante d'un habitus de classe sociale ou de rôle sexué.
• [hal-04035198] Intensity seeking and novelty seeking: Their relationship to adolescent risk behavior and occupational interests

  17 mars 2023

  The aim of this study was to test the hypothesis that individual differences in sensation seeking account for adolescents' risk behavior and vocational interests. We relied on Arnett's (1994) conceptualization of sensation seeking as involving a need for intensity and a need for novelty, neither of which includes the willingness to take risks. Self-report scales measuring intensity seeking, novelty seeking, impulsiveness, risk behavior and vocational interest were administered to 636 adolescents. New scales measuring intensity seeking (IS) and novelty seeking (NS) were used. Regression analyses showed that IS and to a lesser extent NS accounted for a small part of variance of risk behavior, independent of impulsiveness. IS and NS accounted for vocational interests. The discussion emphasizes the importance of disentangling sensation seeking as a trait from willingness to take risks when one intends to analyse the effect of the former on risk behavior.
• [hal-04035310] Social anxiety with peers in 9- to 14-year-olds. Developmental process and relations with self-counsciousness and perceived peer acceptance

  17 mars 2023

  Studied the development and psychological correlates of social anxiety with peers in early adolescence, and whether there were age and gender differences. 508 French 4th–9th graders completed questionnaires assessing their perception of peer-related social anxiety, and the social cognitive dimensions of inward and outward self-consciousness and perceived peer acceptance. Results show that overall, there was a decreasing tendency with age for social anxiety and inward self-consciousness, although the participants increasingly perceived themselves to be neglected by their peers. Analyses suggested that inward self-consciousness, outward self-consciousness, and perceived peer acceptance contribute independently to social anxiety. The only sex difference in social anxiety was higher fear of negative evaluation among girls. Boys scored slightly higher than girls on perception of peers as liking them. These results may suggest which educational and clinical methods are most appropriate for helping adolescents who face high social anxiety.

ACTUALITES

2023/06/30 - Articles de Johana Ryšavá

• Infants can distinguish between sounds of different bird species, as discovered at the University of Nanterre
• Why should we fight for the education of our children?

2022/04/07 - Michel Kreutzer, sur France Culture (du 04/04/2022 au 07/04/2022 - disponible en podcast en intégralité dès le lundi après la diffusion du premier épisode), dans l'émission LSD -  Série documentaire "L'intelligence du vivant", de Franck Bessière, réalisée par Anne Fleury
1er épisode - "Définir le vivant" « Depuis pas mal d'années, on se rend compte que les êtres vivants, les organismes, notamment les vertébrés supérieurs, les oiseaux, les mammifères, recherchent également ce qui est source de plaisir. Un vivant, c'est donc aussi un être qui recherche des plaisirs et qui essaie d'éviter les déplaisirs. C'est une des raisons sans doute pour laquelle aujourd'hui, on donne tant d'importance à la souffrance animale et qu'on estime que l'on doit se donner des règles éthiques dans nos relations avec les animaux. »
2ème épisode - "L'humain un vivant d'exception"
3ème épisode - "Dans la tête des animaux" « Les émotions entrent pleinement dans les études éthologiques, qui ne se limitent donc plus seulement aux comportements. »
4ème épisode - "Le génie du vivant"

2022/03/30 - Michel Kreutzer, au Musée du Quai Branly - Université populaire 2021/2022, Thème 2 : Le corps - "L'"apprendre animal" : comment le savoir se transmet et s'apprend chez les animaux" 
2021/12/07 - Rana Esseily, Carla Aimé, Dalila Bovet et Maya Gratier, à la Philharmonie de Paris - Colloque "Pédagogie du chant choral" - "Résultats de l'étude scientifique -  impacts sur les capacités psychosociales, les apprentissages scolaires et le bien-être des enfants" (10h20)
https://philharmoniedeparis.fr/fr/activite/colloque/23002-pedagogie-du-chant-choral
2021/10/26 - Michel Kreutzer, sur France Inter, dans l’émission "Grand bien vous fasse" - "Autour des ‘Folies animales'"
2021/10/13 - Michel Kreutzer interviewé par Caroline Lachowski, sur RFI , dans l'émission "Autour de la question" - "La folie est-elle le propre de l’homme ?"
2021/10/11 - Rana Esseily sur France Culture, dans l'émission "La méthode scientifique" - "Rire : c’est du sérieux!"
2021/03/28 - Michel Kreutzer, interviewé par Octave Larmagnac-Matheron, dans Philosophie magazine - "Zoopsychiatrie : À la découverte des folies animales"
2021/03/25 - Michel Kreutzer, invité de l’association CVA (Connaissance et Vie d’Aujourd’hui) de Lille - Conférence "Éthologie : sommes-nous tous des bêtes ?"


ARCHIVES TELE / RADIO
2017/10/26 : France Infos junior - "Que se passe-t-il dans la tête des bébés ?"
2017/03/26 : France Inter - "Les Savanturiers" - en direct du salon du livre (à partir de 40 min 20) pour la promotion de La science à Contrepied paru aux éditions Belin.
2017/04/12 : France 3 - Le monde de Jamy : "Ces animaux si proches de nous"
2015/01/02 : France 5 - C dans l'air : "Mon chat est-il une personne ?"
2014/07/07 : France culture - Les matins d'été, 2ème partie : Les invités culture/Idées. "Malin comme un corbeau", avec deux éthologues Agatha Lievin-Bazin et Valérie Dufour (à partir de la 98ème minute).
2013/06 : NBC News - "Finches sing like birds and their dad taught them how"
2014/04 : France Culture - "L'intelligence du perroquet"
2013/10 : France Culture - Emission Continent Science : "L’homosexualité animale" (audio 54').
Cité des sciences et de l'industrie - Cycle de conférences Universciences "Corps et esprit : indissociables" : "Accéder à la vie subjective des animaux" - Michel Kreutzer.
2012/12 : The Telegraph "Parrot listens to Scissor Sisters' music".
2012/12 : France 5 - Emission "On n'est pas que des cobayes" : "Les éléphants ont-ils peur des souris".
2011/05 : France Inter - Emission "Vivre avec les bêtes", 29 mai :  http://www.franceinter.fr/em/vivre-avec-les-betes/105163 (05/2011)

ARCHIVES PRESSE ECRITE
2019/11/30 : The Economist - Male nightingales spend the winter practising.
2019/11/26 : New Scientist - Nightingales practise new songs in winter to impress mates in spring.
2017/03 :  Sciences Psy - Le tempo de notre quotidien - Et si nous prenions le temps ?, pp.30.
2014/12 : Santé magazine, n°469 sur l'empathie.
2014/09/03 : BMC - The unheard message of larksong.
2014/06 : JDD - L'intelligence des corbeaux
2013/11 : JDD - Comment les oiseaux apprennent-ils à chanter ?
2012/03&04 : Cerveau&Psycho - Le perroquet mentaliste.
2011 : Le Pigeon en Ville - La vie sociale du pigeon Bizet.
2011/12 : Le Républicain Lorrain - Les pigeons sont physionomistes.
2011/08 : Futura Sciences -  Les canaris font leur show... et s'adaptent à leur public !
2011/08 : Les Echos - Le perroquet, une langue et un cerveau.
2011/05 : BBC News - Parrots choose to work together.
2011/05 : Maxisciences - Intelligence du perroquet gris : collaboration et personnalité.
2011/05 : PhysOrg - Parrots display teamwork and decision-making skills.
2009/04 : Science Actualité, Universciences - Des piafs malins comme des singes.
2005/02 : BBC News - Sleep helps birds sing better.
A good night's sleep helps young birds master the art of singing, but only after a rather groggy start, Nature magazine has reported.
Savoirs Essonne - Masculin/féminin : le genre existe-t-il chez les animaux ?

Contribution de Laurent Nagle : "Les lions et les lionnes : des prédateurs aux moeurs parfois surprenantes" et  "L'antiquité gréco-romaine : un foyer d'anti-spécistes avant l'heure ?"
Le lion dans le pourtour méditerranéen sous la direction de Margaux Spruyt et Véronique Vassal - journées d'études du 11 & 12 mai 2023 à l'Institut Catholique de Paris. Editions du Cerf, janvier 2025