Network Connectivity Dynamics,Cognitive Biases,and the Evolution of Cultural Diversity in Round-Robin Interactive Micro-Societies

The distribution of cultural variants in a population is shaped by both neutral evolutionary dynamics and by selection pressures. The temporal dynamics of social network connectivity, that is, the order in which individuals in a population interact with each other, has been largely unexplored. In this paper, we investigate how, in a fully connected social network, connectivity dynamics, alone and in interaction with different cognitive biases, affect the evolution of cultural variants. Using agent-based computer simulations, we manipulate population connectivity dynamics (early, mid, and late full-population connectivity); content bias, or a preference for high-quality variants; coordination bias, or whether agents tend to use self-produced variants (egocentric bias), or to switch to variants observed in others (allocentric bias); and memory size, or the number of items that agents can store in their memory. We show that connectivity dynamics affect the time-course of variant spread, with lower connectivity slowing down convergence of the population onto a single cultural variant. We also show that, compared to a neutral evolutionary model, content bias accelerates convergence and amplifies the effects of connectivity dynamics, while larger memory size and coordination bias, especially egocentric bias, slow down convergence. Furthermore, connectivity dynamics affect the frequency of high-quality variants (adaptiveness), with late connectivity populations showing bursts of rapid change in adaptiveness followed by periods of relatively slower change, and early connectivity populations following a single-peak evolutionary dynamic. We evaluate our simulations against existing data collected from previous experiments and show how our model reproduces the empirical patterns of convergence.     

PREPARATION FOR EFFECTIVE SELF-REGULATION: THE DEVELOPMENT OF GENERALIZED VERBAL CONTROL

A correspondence training procedure was used to develop consistency between children's verbalizations and their subsequent behavior across increasingly remote settings and time. The interval of time between the verbalizations and the opportunity to engage in several target behaviors was systematically increased across four preschool settings. Probes of generalized verbal control of home behaviors were conducted throughout training and showed that generalization was obtained in the absence of any salient externally imposed contingencies after the children had reliably come under the control of verbalizations about preschool behaviors.     

On S

The sentential logic S extends classical logic by an implication-like connective. The logic was first presented by Chellas as the smallest system modelled by contraining the Stalnaker-Lewis semantics for counterfactual conditionals such that the conditional is effectively evaluated as in the ternary relations semantics for relevant logics. The resulting logic occupies a key position among modal and substructural logics. We prove completeness results and study conditions for proceeding from one family of logics to another.We are grateful to Peter Apostoli, Kosta Doen, and anonymous referees for their comments on an earlier version of this paper. A.F.'s work has been supported by a grant from the Volkswagen-Stiftung.Presented byJan Zygmunt     

Standardization and norms for a Hebrew naming test

This paper describes a Hebrew naming test that consists of 48 line drawings ordered by word frequency. The initial validation phase included 48 young adults (ages 20-28), 48 old adults (ages 67-85), and 27 individuals with Alzheimer's disease (ages 68-87). Results indicated a modest odd-even internal consistency effect, word frequency effect, and sensitivity to neurological disease. The normative population included 365 participants, aged 18-85. Means of correct answers (responses provided spontaneously and those following a functional cue), of spontaneous responses alone, and of responses provided after a functional and after a phonemic cue are presented, along with cumulative percentiles for the total score. Results show that age had the greatest effect on naming performance with age at immigration accounting for a significant share of the variance as well.     

Language-specific effects on number computation in toddlers

A fundamental question in developmental science is how brains with and without language compute numbers. Measuring young children's verbal reactions in France (Paris) and in England (Oxford), here we show that, although there is a general arithmetic ability for small numbers that is shared by monkeys and preverbal infants, the development of such initial knowledge in humans follows specific performance patterns, depending on what language the children speak.     

Situation and Personality Correlates of Psychological Well-Being: Social Activity and Personal Control

Two studies that examined the correlates of peoples′ reports of their own psychological well-being are reported (Ryff, 1989). In Study 1, extraverts reported better psychological adjustment than introverts, especially when they completed the questionnaires with no one else present. Need for social approval and the sex of the participant were unrelated to self-reports of well-being. Satisfaction with social activities, especially activities involving friends and parents, predicted psychological well-being but the frequency of social activity did not. Completing questionnaires in the presence of friends led to better self-assessments of well-being than completing them in the presence of strangers. In Study 2, internal locus of control, high desire for control, and being female, as well as perceived control over the testing situation, were found to predict reports of better psychological adjustment. It is suggested that future research on self-assessments of psychological well-being focus on: (a) the interaction effects of personality and situational variables; (b) the difference between seeking social interaction and seeking social approval: (c) the distinction between platonic and romantic relationships, and; (d) changes in the correlates of psychological well-being throughout the life-cycle.     

Neurobiological and endocrine correlates of individual differences in spatial learning ability

The polysialylated neural cell adhesion molecule (PSA-NCAM) has been implicated in activity-dependent synaptic remodeling and memory formation. Here, we questioned whether training-induced modulation of PSA-NCAM expression might be related to individual differences in spatial learning abilities. At 12 h posttraining, immunohistochemical analyses revealed a learning-induced up-regulation of PSA-NCAM in the hippocampal dentate gyrus that was related to the spatial learning abilities displayed by rats during training. Specifically, a positive correlation was found between latency to find the platform and subsequent activated PSA levels, indicating that greater induction of polysialylation was observed in rats with the slower acquisition curve. At posttraining times when no learning-associated activation of PSA was observed, no such correlation was found. Further experiments revealed that performance in the massed water maze training is related to a pattern of spatial learning and memory abilities, and to learning-related glucocorticoid responsiveness. Taken together, our findings suggest that the learning-related neural circuits of fast learners are better suited to solving the water maze task than those of slow learners, the latter relying more on structural reorganization to form memory, rather than the relatively economic mechanism of altering synaptic efficacy that is likely used by the former.     

Evaluating the “possums” health professional training in parent–infant sleep

Infant sleep problems are among the most common issues reported by parents in the postnatal period. Yet, infant sleep and infant sleep interventions remain controversial. This study evaluated health professional training in a novel approach to parent–infant sleep: the Possums Sleep Intervention. Health professionals (n = 144) completed a short survey before and after the training, which focused on the sleep component. The Possums Sleep Intervention training included the following topics: sleep science, cued care, sleep hygiene, relaxation for parents and babies, problem solving, and acceptance and commitment therapy (ACT). Health professionals reported: improvements in knowledge on infant sleep regulation, the mother–infant relationship and ACT; improvements in health professionals’ own sleep quality; improvements in psychological flexibility; and a reduction in professional burnout and secondary traumatic stress. Moreover, the health professional training was received positively. Overall, this study is supportive of the Possums Sleep Intervention health professional training.     

The legitimizing role of accent on discrimination against immigrants

This article analyses the influence of accent on discrimination against immigrants by examining the hypothesis that accent leads to discrimination only in more prejudiced individuals, merely because people speaking with a native accent are perceived to be better qualified than those whose accent is non‐standard. In Study 1 (N = 71), we found that only prejudiced individuals use accent to discriminate against immigrants. In Study 2 (N = 124), we replicated this effect and found that the influence of accent on discrimination is mediated by the perceived quality of the accent. Study 3 (N = 105) replicated the previous results even after controlling for the effect of stereotyping. These results are the first experimental illustration of the hypothesis that accent triggers intergroup discrimination only among prejudiced individuals because they evaluate native accents as being qualitatively better than accents of immigrants, thereby legitimizing ingroup bias.