Systematic mapping of developmental milestones in wild chimpanzees

Postnatal development is protracted relative to lifespan in many primates, including modern humans (Homo sapiens), facilitating the acquisition of key motor, communication and social skills that can maximize fitness later in life. Nevertheless, it remains unclear what evolutionary drivers led to extended immature periods. While the developmental milestone literature is well established in humans, insight we can gain from one‐species models is limited. By comparing the timing of relatable developmental milestones in a closely related species, the chimpanzee (Pan troglodytes), we can gain further understanding of the evolution of such an extended developmental phase. To date, few studies have specifically attempted to estimate developmental milestones in a manner comparable to the human literature, and existing studies lack sufficient sample sizes to estimate which milestones are more plastic with higher inter‐individual variation in the timing of their emergence. Here, we describe the emergence of gross motor, fine motor, social interaction and communication traits from a longitudinal sample of 19 wild chimpanzee infants (8 females and 11 males), Taï National Park, Côte d’Ivoire. Gross motor traits emerged at a mean of 4 months, communication traits at 12 months, social interaction traits at 14 months and fine motor traits at 15 months, with later emerging milestones demonstrating greater inter‐individual variation in the timing of the emergence. This pattern of milestone emergence is broadly comparable to observations in humans, suggesting selection for a prolonged infantile phase and that sustained skills development has a deep evolutionary history, with implications for theories on primate brain development.     

Do you really represent my task? Sequential adaptation effects to unexpected events support referential coding for the joint Simon effect

Recent findings suggest that a Simon effect (SE) can be induced in Individual go/nogo tasks when responding next to an event-producing object salient enough to provide a reference for the spatial coding of one’s own action. However, there is skepticism against referential coding for the joint Simon effect (JSE) by proponents of task co-representation. In the present study, we tested assumptions of task co-representation and referential coding by introducing unexpected double response events in a joint go/nogo and a joint independent go/nogo task. In Experiment 1b, we tested if task representations are functionally similar in joint and standard Simon tasks. In Experiment 2, we tested sequential updating of task co-representation after unexpected single response events in the joint independent go/nogo task. Results showed increased JSEs following unexpected events in the joint go/nogo and joint independent go/nogo task (Experiment 1a). While the former finding is in line with the assumptions made by both accounts (task co-representation and referential coding), the latter finding supports referential coding. In contrast to Experiment 1a, we found a decreased SE after unexpected events in the standard Simon task (Experiment 1b), providing evidence against the functional equivalence assumption between joint and two-choice Simon tasks of the task co-representation account. Finally, we found an increased JSE also following unexpected single response events (Experiment 2), ruling out that the findings of the joint independent go/nogo task in Experiment 1a were due to a re-conceptualization of the task situation. In conclusion, our findings support referential coding also for the joint Simon effect.     

自尊的毕生发展

自尊是心理学的一个重要研究领域, 文章介绍了自尊的毕生发展研究在近三十年来的进展, 主要探讨了自尊的稳定性及其毕生发展的影响因素, 包括年龄、性别、种族和文化、社会经济地位与家庭教养方式等方面, 指出自尊毕生发展的研究将来应关注自尊的纵向研究和本土化研究, 并注意区分和探讨不同形式自尊的发展变化。     

Limits of Neural Computation in Humans and Machines

Science and Engineering Ethics - Aicardi et al. (Ethical and social aspects of neurorobotics, Science and Engineering Ethics, 2020) look to neuroscience to mitigate the limitations of current...     

Object categorization by wild-ranging birds in nest defence

Animal Cognition - Despite object categorization being an important ability for the survival of wild animals, the principles behind this ability have been only scarcely studied using wild-ranging,...     

Getting Even or Getting Equal? Retributive Desires and Transitional Justice

This article examines the effect that different policy interventions of transitional justice have on the desires of the victims of human rights violations for retribution. The retributive desires assessed in this article are conceptualized as individual, collective, and abstract demands for the imposition of a commensurate degree of suffering upon the offender. We suggest a plausible way of reducing victims' retributive desires. Instead of "getting even" in relation to the suffering, victims and perpetrators may "get equal" in relation to their respective statuses, which were affected by political crimes. The article hypothesizes that the three classes of transitional justice: (1) reparation that empowers victims by financial compensation, truth telling, and social acknowledgment; (2) retribution that inflicts punishment upon perpetrators; and (3) reconciliation that renews civic relationship between victims and perpetrators through personal contact, apology, and forgiveness; each contributes to restoring equality between victims and perpetrators, and in so doing decreases the desires that victims have for retribution. In order to test our hypotheses, we conducted a survey of former political prisoners in the Czech Republic. Results from the regression analysis reveal that financial compensation, social acknowledgement, punishment, and forgiveness are likely to reduce victims' retributive desires.     

What is matched in direct matching? Intention attribution modulates motor priming

Converging evidence has shown that action observation and execution are tightly linked. The observation of an action directly activates an equivalent internal motor representation in the observer (direct matching). However, whether direct matching is primarily driven by basic perceptual features of the observed movement or is influenced by more abstract interpretative processes is an open question. A series of behavioral experiments tested whether direct matching, as measured by motor priming, can be modulated by inferred action goals and attributed intentions. Experiment 1 tested whether observing an unsuccessful attempt to execute an action is sufficient to produce a motor-priming effect. Experiment 2 tested alternative perceptual explanations for the observed findings. Experiment 3 investigated whether the attribution of intention modulates motor priming by comparing motor-priming effects during observation of intended and unintended movements. Experiment 4 tested whether participants' interpretation of the movement as triggered by an external source or the actor's intention modulates the motor-priming effect by a pure instructional manipulation. Our findings support a model in which direct matching can be top-down modulated by the observer's interpretation of the observed movement as intended or not.     

Dispositional Anxiety and Frontal‐Midline Theta: On the Modulatory Influence of Sex and Situational Threat

In their adaptive control hypothesis, Cavanagh and Shackman (2015) recently claimed that dispositional anxiety is correlated with frontal‐midline theta (FMθ) as a generic “need for control” signal of the anterior midcingulate cortex. Here, we tested this assumption, also considering potential modulatory influences of anticipatory threat and individuals’ sex. In a nonclinical sample of 168 participants (84 women), electroencephalogram was recorded while individuals performed a simple two‐choice task. Half of the participants were assigned to a threat anticipation condition (anticipation of public speaking), whereas the other half was assigned to a control condition. State anxiety was monitored across the experiment. Dispositional anxiety was assessed by self‐report scales, which were completed before individuals came to the laboratory. Target stimuli in the two‐choice task induced a transient increase in FMθ power that was subject to an interaction of dispositional anxiety, sex, and experimental group. Only in women who anticipated public speaking did we observe a substantial positive relation between dispositional anxiety and general FMθ power. Our results indicate that the link between dispositional anxiety and FMθ is not universal but rather depends on complex interactions of individuals’ sex and situational threat.