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.

     

Asynchronous stimulus presentation in visual extinction: A psychophysical study

Patients showing visual extinction as a consequence of a unilateral brain lesion can correctly detect a single stimulus in either hemifield but fail to detect the contralesional stimulus (or at least process the stimulus less efficiently) when it is presented simultaneously with an ipsilesional stimulus. In an attempt to uncover the nature of the underlying deficit, some studies have manipulated the temporal characteristics of stimulus presentation. Contra- and ipsilesional stimuli with different stimulus onset asynchronies are typically used. In the present study, visual extinction was investigated in a group of left neglect patients (N=10) using a psychophysical paradigm with different stimulus onset asynchronies of target and distractor stimuli presented in different hemifields. Contrast thresholds for a target grating were determined with the target either in isolation or in the presence of an irrelevant distractor grating. When target and distractor gratings were presented simultaneously, neglect patients showed a significant extinction effect, i.e., a significant interference from the right hemifield distractor with left hemifield contrast sensitivity. When the right hemifield distractor preceded the left hemifield target stimulus by 250 ms, two different patterns of results were observed in the neglect patients. Five patients showed a significant improvement compared to the simultaneous presentation condition, five other patients showed a significant increase of the extinction effect. The results suggest that different underlying mechanisms, maybe due to different lesion locations, can cause extinction in neglect patients.     

CHANGE IN SELF‐IMAGE AND PTSD SYMPTOMS IN SHORT‐TERM THERAPIES WITH TRAUMATIZED REFUGEES

In this study, an attempt was made to evaluate changes in the self‐image of traumatized refugees receiving short‐term psychotherapy. Fourteen clients with war and torture experiences were followed during and after trauma‐focused therapies with self‐rating instruments. Outcome was measured with SCL‐90, measuring overall psychiatric symptoms, and with PTSS‐10, measuring Post‐traumatic Stress Disorder (PTSD) symptoms. Self‐image was measured with Structural Analysis of Social Behavior (SASB). The analyses showed considerable remission of both general psychiatric and PTSD‐related symptoms, but more moderate changes in self‐image aspects. The positive aspect of the self‐image was virtually non‐related to the symptom measures and did not change after the termination of the therapy; the negative aspect of the self‐image was more strongly related to the symptoms and changed mainly on the last measurement occasion, 15 months after the therapy end. When clients with good and poor outcome were compared, it was found that those with good outcome had higher initial levels on both the positive and the negative aspects of the self‐images. This was tentatively interpreted as indicating that clients who had invested more energy in their self‐image were better able to utilize the therapy. Different development in the self‐image for these two groups indicated that for some clients, the treatment process might have entailed too much strain.     

Cost–Benefit Associations and Financial Behavior

Financial behavior involves costs and benefits. How strongly costs and benefits are perceived as being related to each other is hypothesised to influence affect, cognition, and behavior. Thus, the subject of cost–benefit associations is relevant in several domains of applied psychology. Illustrated by examples from applied areas like consumption, work, and citizenship, the current paper underlines the importance of cost–benefit associations by presenting theoretical approaches to their analysis and discussing major antecedents and consequences.
Le comportement financier implique des coûts et des bénéfices. Nous testons la façon dont la perception des liens entre coûts et bénéfices influence l'affect, la cognition et les comportements. L'analyse des liens coûts-bénéfices est pertinente pour différents domaines de la psychologie appliquée. Illustrés par des exemples pris dans des domaines d'application comme la consommation, le travail et la citoyenneté, cet article souligne l'importance des liens coûts-bénéfices en présentant les approches théoriques qui ont servis à leur analyse et en discutant de leurs antécédents et leurs conséquences majeurs.     

Big Five personality traits and allostatic load in midlife

Objective: To examine the cross-sectional associations of Big Five personality traits with midlife allostatic load, including the role of sex, socio-demographic factors and health-related behaviours.

Design: Cross-sectional analyses of 5512 members of the Copenhagen Aging and Midlife Biobank, aged 49–63 years, 69% men.

Main outcome measure: Allostatic load (AL) based on 14 biomarkers representing the inflammatory, cardiovascular and metabolic system.

Results: Due to significant sex?×?trait interactions, analyses were stratified by sex. Openness and Conscientiousness were inversely associated with AL in both sexes, and Extraversion was positively associated with AL in men. Adjusting for socio-demographic factors significantly attenuated the association of Openness in both sexes and of Extraversion in men, for whom the inverse association of Agreeableness with AL was strengthened. Further adjusting for health-related behaviours, the Conscientiousness-AL association was attenuated but remained significant, and Agreeableness remained significantly associated with AL in men.

Conclusion: Results imply that higher levels of Agreeableness (in men) and Conscientiousness are associated with lower levels of AL above and beyond socio-demographic factors and health-related behaviours. The study further contributes by demonstrating the relevance of sex?×?trait and trait?×?trait interactions in the personality-health literature.