A learning rule that explains how rewards teach attention

Many theories propose that top-down attentional signals control processing in sensory cortices by modulating neural activity. But who controls the controller? Here we investigate how a biologically plausible neural reinforcement learning scheme can create higher order representations and top-down attentional signals. The learning scheme trains neural networks using two factors that gate Hebbian plasticity: (1) an attentional feedback signal from the response-selection stage to earlier processing levels; and (2) a globally available neuromodulator that encodes the reward prediction error. We demonstrate how the neural network learns to direct attention to one of two coloured stimuli that are arranged in a rank-order. Like monkeys trained on this task, the network develops units that are tuned to the rank-order of the colours and it generalizes this newly learned rule to previously unseen colour combinations. These results provide new insight into how individuals can learn to control attention as a function of reward contingency.     

Personality Expression and Impression Formation in Online Social Networks: An Integrative Approach to Understanding the Processes of Accuracy,Impression Management and Meta‐accuracy

In this paper, we investigate personality expression and impression formation processes in online social networks (OSNs). We explore whether, when and why people accurately judge others' personalities (accuracy), successfully manage the impressions that others form of them (impression management) and accurately infer others' impressions of them (meta‐accuracy) at zero acquaintance. On the basis of targets' OSN profiles (N = 103), overall perceiver impressions were collected and compared with targets' self‐view, desired impression and meta‐perception. In addition, independent groups of thin‐slice perceivers based their personality impressions solely on one of four kinds of information within the OSN profiles (profile picture, interests field, group list and notice board), and more than 300 OSN cues (e.g. attractive person and number of friends) were coded. Results showed evidence of accuracy, impression management and meta‐accuracy, but their extent was moderated by the trait (e.g. Big Five and self‐esteem), the kind of information and the interplay of trait and information. Findings could be explained by cue expression and cue utilization processes (lens model analyses). Future prospects for studying personality impressions in online and offline environments are discussed. Copyright © 2013 European Association of Personality Psychology.     

Teaching practices and elementary classroom peer ecologies

Teachers and students in 39 1st, 3rd and 5th grade classrooms participated in a study of teaching practices and classroom peer networks. Teachers reported on their attitudes towards aggression and withdrawal, provided rationales for their seating arrangements, and were observed on patterns of emotional and instructional support and classroom organization. Students were surveyed or interviewed for peer nominations of friendship, popularity, being cool, and aggressive and prosocial behavior, and from these nominations classroom-level indices were derived concerning the richness of positive and negative social ties among children, the egalitarian or hierarchical nature of social status hierarchies, and classroom norms for aggressive and prosocial behavior. Preliminary results suggest that teachers' attitudes towards social behavior are associated with the degree of liking and disliking their students express; teachers' grouping patterns are associated with numerous features of classroom social networks; and teachers' observed emotional support was associated with higher rates of friendship reciprocation.     

Sex Differences,Weapon Focus,and Eyewitness Reliability

Abstract

Two aspects of eyewitness identification were tested: sex differences in eyewitness reliability and an explanation of the weapon focus effect that is based on object salience. One hundred ninety-one male and female American college students watched a slide sequence that depicted a male or female target person enacting a simple behavioral progression while holding various objects. Afterward, the subjects attempted to identify the target person in a photospread and to recall physical details about him or her on a questionnaire. The results confirmed a predicted own-sex identification bias effect (p < .001) but did not support the object salience hypothesis. An interaction between subject sex and object indicated that men and women attended to and were distracted by different types of objects (p < .009).     

The Effect of Social Networks on the Quality of Political Thinking

In this article we investigate the effect of social networks on the quality of political thinking. First, the article introduces new social network concepts into the literature and develops the corresponding measures. Second, the article explores the quality of political thinking as a concept and develops its measures based on the volume and the causality of thoughts, and their integrative complexity. We make use of a survey to collect information on social networks and the experimental manipulation controls for the effect of policy frames. Our findings consistently show the significant negative impact of cohesive social networks on the quality of policy‐relevant thinking. We conclude that close‐knit social networks could create “social bubbles” that would limit how one communicates with others and reasons about politics.     

Spreading Activation in an Attractor Network With Latching Dynamics: Automatic Semantic Priming Revisited

Localist models of spreading activation (SA) and models assuming distributed representations offer very different takes on semantic priming, a widely investigated paradigm in word recognition and semantic memory research. In this study, we implemented SA in an attractor neural network model with distributed representations and created a unified framework for the two approaches. Our models assume a synaptic depression mechanism leading to autonomous transitions between encoded memory patterns (latching dynamics), which account for the major characteristics of automatic semantic priming in humans. Using computer simulations, we demonstrated how findings that challenged attractor‐based networks in the past, such as mediated and asymmetric priming, are a natural consequence of our present model’s dynamics. Puzzling results regarding backward priming were also given a straightforward explanation. In addition, the current model addresses some of the differences between semantic and associative relatedness and explains how these differences interact with stimulus onset asynchrony in priming experiments.     

Integrating social exchange and affective explanations for the receipt of help and harm: A social network approach

We integrated theories of social exchange and emotion to explain the receipt of interpersonal citizenship (help) and counterproductive behaviors (harm). Using social network methodology, data on a total of 534 relationships were obtained from three samples of employees working for a food services organization. Results were consistent across all three samples. Employees received help and harm from coworkers toward whom they engaged in those behaviors, as well as from coworkers in whom they elicited positive and negative affective states, respectively. Additionally, affective states predicted the receipt of help and harm controlling for engagement, suggesting a means by which social exchanges may become imbalanced. Overall, findings demonstrate the validity of social exchange and affective explanations for the receipt of help and harm in the workplace.     

La croyance au monde juste comme facteur explicatif de diverses réactions à des injustices professionnelles

The belief in a just world is defined as the tendency to consider that “people get what they deserve and deserve what they get”, i.e. to consider that the world is, globally, a place of justice. Facing an individual unjustly victim of negative events and for whom it seems impossible to restore the justice objectively, we frequently deny the existence of the unjustice, even if we say the responsible of what he gets. But if we can react by adopting “passive” reactions (using the victim’s moral or behavioral responsibility, as in Lerner, or evocating a future favoring the victim,..), we can also adopt “active” strategies which can lead to an objective re-establishment of the justice. In the present study, we examined the influence of the degree of the belief in the just world on the selected strategy facing professional injustices. And effectively, our results indicate a some preferences in the use of such or strategy, preferences accentuated by the gender and the professional statute.     

HIV Prevention with Male Prostitutes and Patrons of Hustler Bars: Replication of an HIV Preventive Intervention

The core objectives of this study were to document the process by which a community-based organization replicated and adapted an experimentally developed intervention to its own use and to explore the effectiveness of that HIV prevention program for male prostitutes and other patrons in New York City hustler bars. The intervention model employed was based on previous research with gay men (Kelly, St. Lawrence, Diaz, et al., 1991; Kelly, St. Lawrence, Stevenson, et al., 1992) and inspired by diffusion of innovation theory (Rogers, 1995). The effects of the current intervention were assessed on a sample of 1,741 male prostitutes and bar patrons. Analyses indicated significant reductions in paid, unprotected sexual intercourse and oral sex following the intervention. Analyses further indicated that the data were partially consistent with the program's model, which specified that norms were the putative mediator of behavior change in the intervention. Also, the intervention's effects varied by bar and by participants' race/ethnicity. Data support the utility of the intervention model for an urban sample of men at high risk for HIV infection. The importance of exploring the mechanisms that underlie the intervention is discussed.     

What can make the difference? Premature birth and maternal sensitivity at 3 months of age: the role of attachment organization, traumatic reaction and baby's medical risk

The influence of prematurity and maternal attachment organization on sensitivity was investigated in 40 mother–infant dyads. Results show a main effect of attachment and an interaction between attachment and prematurity. Sensitivity was differently associated with medical risk and mothers’ traumatic reaction, depending on the quality of attachment.