Some antiepileptic compounds impair learning by rats in a Morris water maze

In the present experiments, we investigated the effects of several commonly employed antiepileptic drugs on the performance of adult rats in a Morris water maze task. We found that phenytoin treatment produced the most deleterious performance impairments across all days of training, and that these performance deficits are not likely due to any general sensorimotor impairments. Carbamazepine had milder, but detectable negative effects, as carbamazepine-treated animals exhibited initial acquisition deficits, but rapidly achieved escape levels comparable to controls. In marked contrast, valproate and ethosuximide had no detectable effects on learning in the water maze. These results parallel previous findings in rats treated with these compounds and tested in an instrumental learning task, and are in general agreement with the human clinical literature. To the extent that one might wish to minimize learning deficits associated with maintenance on antiepileptic drugs, phenytoin is definitely not the treatment of choice, while valproate or ethosuximide are apparently much less disruptive.     

Exploring Violence Exposure, Stress, Protective Factors and Behavioral Problems Among Inner-City Youth

This study examined relationships between violence exposure, other stressors, family support, and self-concept on self-reported behavioral problems among 320 urban adolescents (aged 11–18) referred for mental health treatment. Overall, participants reported high levels of violence exposure, with a median of six past encounters with violence as a witness, victim, or through the experiences of associates. All forms of violence exposure (witnessing, being a victim, knowing of victims) were correlated with internalizing and externalizing behavioral problems for males and females. Total violence exposure predicted behavioral problems among participants, even after controlling for the effects of other risk, demographic and protective factors. Family support and self-concept moderated the influence of life stress and cumulative risk on problem behavior outcomes, but these protective variables did not significantly moderate violence exposure.     

Students' perspectives on their high school experience

This study explored students' levels of belonging and engagement in high school by obtaining their perspectives on the instruction, teachers, friends, and activities in their school. We interviewed 33 students from seven comprehensive high schools in Richmond, Virginia. Students indicated that they were more engaged when the instructional program included authentic learning experiences, teachers who provided challenging activities and showed interest in student learning, and a school day that supported interpersonal relationships with peers and adults. It was concluded that, to promote belonging and engagement, school personnel should attend to the quality of student learning and relationships.     

Self-regulation and the extended now: controlling the self alters the subjective experience of time

These studies investigated self-regulation and subjective experience of time from the perspective of the regulatory resource model. Studies 1-2 showed that participants who were instructed to regulate their emotions while viewing a film clip perceived that the film lasted longer than participants who did not regulate their emotions. In Study 3, participants provided time estimates during a resource-depleting or nondepleting task. Subsequent task persistence was measured. Time perceptions mediated the effect of initial self-regulation on subsequent self-regulated performance. In Study 4, participants performed either a resource-depleting or a nondepleting thought-listing task and then performed a different regulatorytask. Compared with nondepleted participants, depleted participants persisted less on the 2nd task but estimated that they had persisted longer. Subjective time estimates statistically accounted for reduced persistence after depletion. Together, results indicate people believe that self-regulatory endeavors last overly long, a belief that may result in abandonment of further self-control.     

I copy you as I believe you know about our culture: Combining imitation and selective trust literatures

Empirical findings and theorizations of both imitation and selective trust offer different views on and interpretations of children's social learning mechanisms. The imitation literature provides ample documentation of children's behavioural patterns in the acquisition of socially appropriate norms and practices. The selective trust literature provides insights into children's cognitive processes of choosing credible informants and what information to learn in future interactions. In this paper, we place together findings from both fields and note that they share analogically similar theoretical underpinnings and offer explanations that are complementary to each other. We contend that children's imitative tendency may be due to their selection of in-group members as cultural experts, who serve as reliable sources of conventional information. Moving forward, we note the importance of evaluating individual differences and cultural factors to provide a more holistic understanding of universality and variation in children's social learning mechanisms.     

The role of collateral information about examinees in item parameter estimation

Standard procedures for estimating item parameters in item response theory (IRT) ignore collateral information that may be available about examinees, such as their standing on demographic and educational variables. This paper describes circumstances under which collateral information about examineesmay be used to make inferences about item parameters more precise, and circumstances under which itmust be used to obtain correct inferences.This work was supported by Contract No. N00014-85-K-0683, project designation NR 150-539, from the Cognitive Science Program, Cognitive and Neural Sciences Division, Office of Naval Research. Reproduction in whole or in part is permitted for any purpose of the United States Government. We are indebted to Tim Davey, Eugene Johnson, and three anonymous referees for their comments on earlier versions of the paper.     

Constructions of emotion: Discrepancy,arousal, and mood

An interactive adventure-type computer game was used to explore the constructive components of emotional experience — sympathetic nervous system arousal and evaluative cognitions — postulated by discrepancy/evaluation theory. Manipulations of expectations produced significant and large heart rate changes for both positive and negative discrepancies. Autonomic response also reflected the degree of interruption/discrepancy produced by an event. Negatively toned (discrepant) events tended to produce significant intensity and higher overall autonomic arousal. In addition, subjects' intensity of experience was related to their autonomic response.The research and preparation of this report were supported by a grant from the Spencer Foundation. We are grateful to Carol Beards, Barbara Lagana, and Jeffrey McIntosh for assistance in data collection and data analysis. Special thanks go to Mark Wallen for programming Rogue and much of the data analysis.     

The role of the hemispheres in closed loop movements

The purpose of these experiments was to determine if the two hemispheres play different roles in controlling closed loop movements. Subjects were asked to move to a narrow or wide target in the left or right hemispace. Reaction time (RT) was faster for the left arm of normals, only in the right hemispace, but there were no differences between arms in movement execution. Right but not left hemisphere stroke (CVA) patients showed longer RTs for the contralateral but not ipsilateral arm. The right CVA group's ipsilateral movement, especially to narrow targets was less accurate. The left CVA group's RT did not benefit from advanced information, but ipsilateral movement execution was normal. These results were discussed in terms of inter- as well as intrahemispheric control of programming and execution of closed loop movements.     

The credibility of children's allegations of sexual abuse

Sexual abuse, the fastest growing type of abuse complaint, often raises issues concerning the credibility of individual allegations. This paper discusses historical, developmental, and societal factors affecting children's credibility and recommended assessment methods that maximize a child's capacity to relate his or her experience. Clinical factors leading to false allegations are discussed.