Directedness and engagement in chimpanzee vocal ontogeny

Directedness and engagement during pre-verbal vocal communication play a major role in language development. What was their role in the evolution of language? This question invites us to examine these behaviours in chimpanzee vocal ontogeny. We collected observational data on infant (N = 15) and juvenile (N = 13) chimpanzees at Chimfunshi Wildlife Orphanage, Zambia. We examined the impact of age and vocalization type (grunts, whimpers, laughs and screams) on directed cues (gaze directedness and face directedness) and engagement (mutual face directedness) during vocal communication. We also assessed the impact of directed cues and engagement on social interactions by coding the behaviour of social partners before, during and after a vocalisation, and examining whether they contingently changed their behaviour in response to the vocalisation if it was directed or if engagement occurred. We found that face directed vocalisations showed a general increase during ontogeny and we observed call-type dependent effects of age for mutual face directedness. Only face directed vocalisations were significantly predictive of behavioural responses in social partners. We conclude that like young humans, young chimpanzees routinely exhibit directed behaviours and engagement during vocal communication. This social competency improves during ontogeny and benefits individuals by increasing the chances of eliciting behavioural responses from social partners. Directedness and engagement likely provide a foundation for language phylogenetically, as well as ontogenetically.

Research Highlights

• We show that directedness and engagement routinely occur during early chimpanzee vocalisations.
• Directedness increases throughout chimpanzee vocal ontogeny, similar to human infants.
• Directedness enhances social partner responsiveness, demonstrating a direct benefit to this style of communication.
• Directedness and engagement could provide a route towards language phylogenetically as well as ontogenetically.

     

Morality,values, traditional bullying,and cyberbullying in adolescence

The aim of the present study was to investigate moral aspects and human values in traditional bullying and cyberbullying, in order to detect differences between the two types of bullying and to test the role of immoral and disengaged behaviours in mediating the relationships between personal values and involvement in bullying. Sample comprised 390 adolescents aged 14–18, balanced for gender, attending different high schools. Traditional and cyberbullying were detected by means of two self‐report measures, while the Portrait Values Questionnaire was used to assess 10 values in four dimensions according to the value system model by Schwartz (1992): self‐trascendence, self‐enhancement, openness to change, and conservation. Finally, immoral and disengaged behaviours were assessed by means of five items about behavioural and personal aspects salient for morality. Results showed that, irrespective of gender, self‐enhancement and self‐trascendence moderately predicted cyber and traditional bullying, respectively, while immoral and disengaged behaviours predicted both. Indirect effects showed that self‐enhancement and openness to change predicted both forms of bullying through immoral behaviour. Results are discussed in terms of similarities and differences between cyber and traditional bullying and with attention to the central role of morality in explaining bullying nature.     

The role of psychologists in requests to hasten death: A literature and legislation review and an agenda for future research

The opportunity for patients to request support to die is legalised in several countries and is associated with the development of a social and political debate that has taken place in recent years. We believe that psychologists can contribute to this debate. Here, we conducted a literature and legislation review with the aim of understanding arguments regarding the roles of the psychologist in hastening death. A systematic review of the peer-review literature in this field was carried out. The legislation of each country with hasten death practices was analysed to understand if psychologists are included in the protocols of hasten death practices. Despite a lack of literature, we found competence assessment, communication, psychological counselling, research and training and public policy to be the possible roles of psychologists in requests to hasten death. Based on the review, an agenda for future research is developed. We highlight the importance of psychology, raising its profile in the study of the various forms of death hastening requests.