Capuchins (Sapajus apella) and their aversion to inequity

Funding: Authors would like to acknowledge the financial support we received from the European Research Council (Synergy grant 609819 SOMICS provided to Josep Call) and the Swiss National Science Foundation (P2BEP3 175269 provided to Manon K. Schweinfurth).Humans have a strong sense of fairness and are usually averse to unequal treatment for the same action. Ever since Brosnan and de Waal showed a similar effect in capuchin monkeys (Sapajus apella), numerous studies using different experimental methods have been conducted to investigate whether animals show inequity aversion like humans do. Capuchin monkeys have become one of the best-studied animals in this area. Our first aim in this chapter was to synthesise the findings in this literature. We found that there is mixed evidence for inequity aversion in capuchin monkeys. Our second aim was to understand this variation by focusing on the following factors: the type of task used, the feeding regime outside the experiment and the monkeys’ social environment. To obtain data on some of these factors, as they are not always reported in published studies, we contacted researchers in the main laboratories conducting this work. We found that responses to inequity systematically varied as a function of the task demands and the feeding regime, but not the social environment. Tasks, in particular pulling tasks, that required participants to expend effort to get the food were more likely to detect evidence of inequity aversion. Moreover, monkeys with access to food before or after testing, were more likely to show inequity aversion than those whose access to food was temporarily restricted. We note that our survey is an explorative approach to investigate the variation in reports on inequity aversion in capuchin monkeys. We hope this chapter raises awareness of the complexity of the concept and generates new testable hypotheses, which might advance our understanding of the theoretical foundations of inequity aversion.PostprintPeer reviewe

Inter-individual coordination in walking chimpanzees

Funding was provided to D.B.B. (St Andrews Undergraduate Research Assistantship Scheme), J.C. and G.K.K. (European Research Council, 609819 SOMICS), and M.K.S. (Swiss National Science Foundation, P2BEP3 175269).Humans, like many other animals, live in groups and coordinate actions with others in social settings.1 Such interpersonal coordination may emerge unconsciously and when the goal is not the coordination of movements, as when falling into the same rhythm when walking together.2 Although one of our closest living relatives, the chimpanzee (Pan troglodytes), shows the ability to succeed in complex joint action tasks where coordination is the goal,3 little is known about simpler forms of joint action. Here, we examine whether chimpanzees spontaneously synchronize their actions with conspecifics while walking together. We collected data on individual walking behavior of two groups of chimpanzees under semi-natural conditions. In addition, we assessed social relationships to investigate potential effects on the strength of coordination. When walking with a conspecific, individuals walked faster than when alone. The relative phase was symmetrically distributed around 0° with the highest frequencies around 0, indicating a tendency to coordinate actions. Further, coordination was stronger when walking with a partner compared with two individuals walking independently. Although the inter-limb entrainment was more pronounced between individuals of similar age as a proxy for height, it was not affected by the kinship or bonding status of the walkers or the behaviors they engaged in immediately after the walk. We conclude that chimpanzees adapt their individual behavior to temporally coordinate actions with others, which might provide a basis for engaging in other more complex forms of joint action. This spontaneous form of inter-individual coordination, often called entrainment, is thus shared with humans.Publisher PDFPeer reviewe

Seeing Is Believing: The CSI Effect Among Jurors in Malicious Wounding Cases

With the popularization of television crime shows that focus heavily on forensic science, such as CSI and its spin-offs, concerns about a new threat to jury trials have emerged in recent years. Dubbed the “CSI effect,” this phenomenon has reportedly come to influence the way jurors perceive forensic evidence at trials based on the way forensic evidence is presented on television. While the CSI effect has been the topic of much discussion throughout the popular press, the CSI effect has seldom been empirically tested. In this study, we present a selection of media accounts as well as criminological and legal literature that provides a review of the current state of the CSI effect. Additionally, we present the findings of a survey of 60 jurors from five malicious wounding cases on the influence of viewing CSI on jury decision-making. Using a logistic regression model, we found that belief in the accuracy of the scientific methods used on CSI was significantly related to juror verdicts

Exploring the Experiences of Transgender and Gender Diverse Adults in Accessing a Trans Knowledgeable Primary Care Physician

Transgender and gender diverse individuals face a variety of barriers when attempting to access healthcare, from discrimination to lack of access to lack of knowledgeable providers. Using data from the 2015 United States Trans Survey (N = 27,715), this study looks at the differences within the TGD population regarding having seen a doctor in the past year, having a primary care provider, and having a primary care provider who is knowledgeable about trans health. Logistic regressions indicate that even within an all transgender and gender diverse sample, a variety of identities and experiences are related to increased or decreased likelihood of each of these outcomes, with significant differences across gender, race/ethnicity, age, sexual orientation, disability status, educational attainment, annual income, disability status, religiosity, military status, overall health, housing status, and insurance coverage. Not only should there be an effort to support transgender and gender diverse individuals in accessing care, but there is a clearly indicated need for additional education for healthcare providers, especially those doing primary care, on how to offer knowledgeable, affirming, and intersectional care to their patients

Reciprocity : different behavioural strategies, cognitive mechanisms and psychological processes

The Swiss National Science Foundation provided funding to MKS (grant number P2BEP3 175269). The European Research Council provided funding to JC (Synergy grant 609819 SOMICS).Reciprocity is probably one of the most debated theories in evolutionary research. After more than 40 years of research, some scientists conclude that reciprocity is an almost uniquely human trait mainly because it is cognitively demanding. Others, however, conclude that reciprocity is wide-spread and of great importance to many species. Yet, it is unclear how these species reciprocate, given its apparent cognitive complexity. Therefore, our aim was to unravel the psychological pro-cesses underlying reciprocity. By bringing together findings from studies investigating different aspects of reciprocity, we show that reciprocity is a rich concept with different behavioural strate-gies and cognitive mechanisms that require very different psychological processes. We reviewed evidence from three textbook examples, i.e. the Norway rat, common vampire bat and brown capuchin monkey and show that the species use different strategies and mechanisms to recipro-cate. We continue by examining the psychological processes of reciprocity. We show that the cog-nitive load varies between different forms of reciprocity. Several factors can lower the memory demands of reciprocity such as distinctiveness of encounters, memory of details and network size. Furthermore, there are different information operation systems in place, which also vary in their cognitive load due to assessing the number of encounters and the quality and quantity of help. We conclude that many species possess the psychological processes to show some form of reciprocity. Hence, reciprocity might be a widespread phenomenon that varies in terms of strategies and mechanisms.Publisher PDFPeer reviewe

Disruption of Hydrogen Bonds between Major Histocompatibility Complex Class II and the Peptide N-Terminus Is Not Sufficient to Form a Human Leukocyte Antigen-DM Receptive State of Major Histocompatibility Complex Class II

Peptide presentation by MHC class II is of critical importance to the function of CD4+ T cells. HLA-DM resides in the endosomal pathway and edits the peptide repertoire of newly synthesized MHC class II molecules before they are exported to the cell surface. HLA-DM ensures MHC class II molecules bind high affinity peptides by targeting unstable MHC class II:peptide complexes for peptide exchange. Research over the past decade has implicated the peptide N-terminus in modulating the ability of HLA-DM to target a given MHC class II:peptide combination. In particular, attention has been focused on both the hydrogen bonds between MHC class II and peptide, and the occupancy of the P1 anchor pocket. We sought to solve the crystal structure of a HLA-DR1 molecule containing a truncated hemagglutinin peptide missing three N-terminal residues compared to the full-length sequence (residues 306–318) to determine the nature of the MHC class II:peptide species that binds HLA-DM. Here we present structural evidence that HLA-DR1 that is loaded with a peptide truncated to the P1 anchor residue such that it cannot make select hydrogen bonds with the peptide N-terminus, adopts the same conformation as molecules loaded with full-length peptide. HLA-DR1:peptide combinations that were unable to engage up to four key hydrogen bonds were also unable to bind HLA-DM, while those truncated to the P2 residue bound well. These results indicate that the conformational changes in MHC class II molecules that are recognized by HLA-DM occur after disengagement of the P1 anchor residue

Sizes of walleye pollock (Theragra chalcogramma) and Atka mackerel (Pleurogrammus monopterygius) consumed by the western stock of Steller sea lions (Eumetopias jubatus) in Alaska from 1999 to 2000

Prey-size selectivity by Steller sea lions (Eumetopias jubatus) is relevant for understanding the foraging behavior of this declining predator, but studies have been problematic because of the absence and erosion of otoliths usually used to estimate fish length. Therefore, we developed regression formulae to estimate fish length from seven diagnostic cranial structures of walleye pollock (Theragra chalcogramma) and Atka mackerel (Pleurogrammus monopterygius). For both species, all structure measurements were related with fork length of prey (r2 range: 0.78−0.99). Fork length (FL) of walleye pollock and Atka mackerel consumed by Steller sea lions was estimated by applying these regression models to cranial structures recovered from scats (feces) collected between 1998 and 2000 across the range of the Alaskan western stock of Steller sea lions. Experimentally derived digestion correction factors were applied to take into account loss of size due to digestion. Fork lengths of walleye pollock consumed by Steller sea lions ranged from 3.7 to 70.8 cm (mean=39.3 cm, SD=14.3 cm, n=666) and Atka mackerel ranged from 15.3 to 49.6 cm (mean=32.3 cm, SD=5.9 cm, n=1685). Although sample sizes were limited, a greater proportion of juvenile (≤20 cm) walleye pollock were found in samples collected during the summer (June−September) on haul-out sites (64% juveniles, n=11 scats) than on summer rookeries (9% juveniles, n=132 scats) or winter (February−March) haul-out sites (3% juveniles, n=69 scats). Annual changes in the size of Atka mackerel consumed by Steller sea lions corresponded to changes in the length distribution of Atka mackerel resulting from exceptionally strong year classes. Considerable overlap (>51%) in the size of walleye pollock and Atka mackerel taken by Steller sea lions and the sizes of these species caught by the commercial trawl fishery were demonstrated

Chimpanzees prepare for alternative possible outcomes

When facing uncertainty, humans often build mental models of alternative outcomes. Considering diverging scenarios allows agents to respond adaptively to different actual worlds by developing contingency plans (covering one's bases). In a pre-registered experiment, we tested whether chimpanzees (Pan troglodytes) prepare for two mutually exclusive possibilities. Chimpanzees could access two pieces of food, but only if they successfully protected them from a human competitor. In one condition, chimpanzees could be certain about which piece of food the human experimenter would attempt to steal. In a second condition, either one of the food rewards was a potential target of the competitor. We found that chimpanzees were significantly more likely to protect both pieces of food in the second relative to the first condition, raising the possibility that chimpanzees represent and prepare effectively for different possible worlds.PostprintPeer reviewe

Are We Engaged? A College-level Inventory of Community Engagement

In this study, a team of six faculty members from Weber State University’s Telitha E. Lindquist College of Arts & Humanities tested and applied the Engaged College Rubric as part of a pilot program. Based on this application of the rubric, the committee found that the college tended toward the “Emerging” (i.e., first stage) classification for most items, thus indicating a need to continue developing programs and practices that center on community engagement (CE) within the college. The primary finding from this activity was that fragmentation exists surrounding CE in the college, within its constituent departments, and at the university level. This fragmentation limits the effectiveness of community-engaged learning, teaching, and scholarship. The committee’s findings, and interpretations of the rubric elements, are discussed, as are recommendations for future use of the Engaged College Rubric