Chimpanzees’ use of conspecific cues in matching-to-sample tasks: public information use in a fully automated testing environment

Social animals have much to gain from observing and responding appropriately to the actions of their conspecific group members. This can in turn lead to the learning of novel behavior patterns (social learning) or to foraging, ranging, or social behavioral choices copied from fellow group members, which do not necessarily result in long-term learning, but at the time represent adaptive responses to environmental cues (public information use). In the current study, we developed a novel system for the study of public information use under fully automated conditions. We modified a classic single-subject laboratory paradigm—matching-to-sample (MTS)—and examined chimpanzees’ ability to interpret and utilize cues provided by the behavior of a conspecific to solve the task. In Experiment 1, two subjects took turns on an identity MTS task, with one subject (the model) performing the first half of the trial and the other subject (the observer) completing the trial using the model’s actions as discriminative cues. Both subjects performed above chance from the first session onwards. In Experiment 2, the subjects were tested on a symbolic version of the same MTS task, with one subject showing spontaneous transfer. Our study establishes a novel method for examining public information use within a highly controlled and automated setting.     

Long‐term immigrant adaptation: Eight‐year follow‐up study among immigrants from Russia and Estonia living in Finland

This study was a longitudinal investigation of the three different dimensions of long‐term immigrant adaptation (i.e., psychological, sociocultural, and socioeconomic adaptation) and the relationships between them in an 8‐year follow‐up with panel data. The 282 respondents were immigrants in Finland, born between 1961 and 1976, coming from the former Soviet Union. The results suggest that the adaptation of these immigrants has developed favourably. In 8 years, the respondents had improved their Finnish language skills and their position in the labour market. No differences were observed in their levels of psychological well‐being between the two assessments. Of the three adaptation dimensions assessed, sociocultural adaptation, measured as proficiency in understanding, speaking, reading, and writing Finnish, turned out to be the most significant predictor of the two other long‐term outcomes of immigrant adaptation (i.e., socioeconomic and psychological). In particular, the better the initial command of the Finnish language, the better were their socioeconomic and psychological adaptation outcomes after 8 years of residence. These results demonstrate the importance of parallel and longitudinal assessments of the different outcomes of immigrant adaptation in order to address which particular dimensions of adaptation are most critical in the beginning of acculturation in terms of determining positive development and long‐term immigrant adaptation.     

Antecedents of coworker trust: leaders' blessings

Although employee trust in leaders has garnered substantial empirical research, trust between coworkers has been virtually ignored. Extending the work of D. L. Ferrin, K. T. Dirks, and P. P. Shah (2006), the authors examined the role of group leaders, an influential third party in the workplace, on coworker trust formation. The correlates of the extent to which coworkers trust one another were examined in an investigation of 146 members of 32 work groups representing 4 diverse organizations. In this study, which utilized full network data, coworker trust was operationalized as in-degree centrality in the trust network. Controlling for relational demography and coworker helping behaviors, the authors found, as hypothesized, that coworkers tended to place more trust in fellow coworkers who were also trusted by the teams' formal leaders than in coworkers who were less trusted by leaders. In addition, consistent with the social information processing theory, support was found for the hypothesis that the relationship between leaders' trust and coworker trust is stronger when group performance is poor.     

Effects of trusting and being trusted on team citizenship behaviours in chain stores

Previous studies showed a robust and positive relationship between subordinates' trust for leaders and their individual organizational citizenship behaviours. Building on this foundation, we examined two extensions. First, based on the team citizenship behaviours approach, we studied whether the same relationship held at the group level. Second, drawing from literature on leadership and self-efficacy, we studied whether leaders' perceptions of being trusted by their subordinates mattered in this trust relationship; we also examined how this perception affected team citizenship behaviours. Results showed that subordinates' trust for leaders and team citizenship behaviours were positively related at the team level. When leaders felt more trusted, teams showed more citizenship behaviours. Beyond these main effects, leaders' felt trust was found to negatively moderate the relationship between staff trust for leaders and team citizenship behaviours. Theoretical and practical implications of this research are discussed.     

Pronorm and antinorm deviants: a test of the subjective group dynamics model

The authors replicated the study by D. Abrams, J. M. Marques, N. Bown, and M. Henson (2000, Study 2), performed to test the subjective group dynamics model (J. M. Marques, D. Abrams, D. Paez, & C. Martinez-Taboada, 1998). Participants were students enrolled in the psychology department at an Italian university. The present study considered the relationship between students and professors, and the attitude object was limited enrollment for admission to the department. Participants evaluated either in-group or out-group members. Findings replicated those of Abrams et al., except the in-group pronorm deviant was perceived to be less typical and evaluated less positively than the normative members. This finding suggests that, during an intergroup conflict, perception of the typicality of deviants exaggerating the in-group norms--and thus their evaluations--may increase as long as deviance is not perceived to be too accentuated.     

The impact of relational demographics on perceived managerial trustworthiness: similarity or norms?

Perceived trustworthiness is a critical antecedent of interpersonal trust, yet researchers have a limited understanding of how such perceptions are generated. The authors used 2 competing perspectives within the relational demography literature--similarity-attraction and relational norms--to empirically examine the effect of demographic differences. Whereas the similarity-attraction account suggests that subordinates will perceive their managers as more trustworthy when managers and staff are similar in demographic attributes, the relational norms account proposes that subordinates will perceive their managers as more trustworthy when their demographic differences follow normative expectations. Data collected from a field study of 178 manager-subordinate dyads in Hong Kong and Macau support the relational norms account in terms of education and organizational rank. The authors discuss the theoretical and practical implications of the study.     

Genetic and environmental bases of childhood antisocial behavior: a multi-informant twin study

Genetic and environmental influences on childhood antisocial and aggressive behavior (ASB) during childhood were examined in 9- to 10-year-old twins, using a multi-informant approach. The sample (605 families of twins or triplets) was socioeconomically and ethnically diverse, representative of the culturally diverse urban population in Southern California. Measures of ASB included symptom counts for conduct disorder, ratings of aggression, delinquency, and psychopathic traits obtained through child self-reports, teacher, and caregiver ratings. Multivariate analysis revealed a common ASB factor across informants that was strongly heritable (heritability was .96), highlighting the importance of a broad, general measure obtained from multiple sources as a plausible construct for future investigations of specific genetic mechanisms in ASB. The best fitting multivariate model required informant-specific genetic, environmental, and rater effects for variation in observed ASB measures. The results suggest that parents, children, and teachers have only a partly "shared view" and that the additional factors that influence the "rater-specific" view of the child's antisocial behavior vary for different informants. This is the first study to demonstrate strong heritable effects on ASB in ethnically and economically diverse samples.     

“On the Move” or “Staying Put”: Locomotion,Need for Closure,and Reactions to Organizational Change1

Four studies conducted in various organizations in Italy, employing contemporaneous and longitudinal designs, tested hypotheses relating 2 personality constructs—need for cognitive closure ( Kruglanski & Webster, 1996 ) and locomotion tendency ( Higgins, Kruglanski, & Pierro, 2003 ; Kruglanski et al., 2000 )—to individuals’ ability to successfully cope with organizational change. Across diverse organizational settings, populations studied, types of organizational change implemented, and measures of coping with change, we found that need for closure was negatively related, and locomotion tendency was positively related, to coping with change. We also found that the negative relation between need for closure and coping was attenuated where organizational climate is supportive of change, and that degree of successful coping with change determines post‐change work attitudes.     

Effects of trophic poisoning with methylmercury on the appetitive elements of the agonistic sequence in fighting-fish (Betta splendens)

The aggressive display in Betta splendens is particularly prominent, and vital to its adaptation to the environment. Methylmercury is an organic variation of Hg that presents particularly pronounced neuro-behavioral effects. The present experiments aim to test the effect of acute and chronic poisoning with methylmercury on the display in Bettas. The animals were poisoned by trophic means in both experiments (16 ug/kg in acute poisoning; 16 ug/kg/day for chronic poisoning), and tested in agonistic pairs. The total frequency of the display was recorded, analyzing the topography of the agonistic response. The methylmercury seems to present a dose- and detoxification-dependent effect on these responses, with a more pronounced effect on motivity in acute poisoning and on emotionality in the chronic poisoning. It is possible that this effect could be mediated by alteration in the mono-amino-oxidase systems.