The temporal course of suppression during binocular rivalry

Orthogonally oriented sinusoidal luminance gratings were dichoptically presented to the observers' left and right eyes. During the subsequent binocular rivalry, a small target was briefly presented (4AFC) to probe the strength of interocular suppression at various temporal latencies. Both stationary and moving rivalrous patterns were investigated. The purpose of experiment 1 was to compare the temporal characteristics of stationary and motion rivalry (0 and 1.2 deg s-1), while that of experiment 2 was to examine rivalry suppression for higher speeds (2 and 4 deg s-1). In all cases, it was found that the strength of suppression remained essentially constant throughout a single phase of binocular rivalry. The results of the investigation also revealed that moving rivalrous patterns lead to greater magnitudes of interocular suppression than static patterns. Despite these differences in the strength of suppression, the results of both experiments show that the temporal characteristics of motion and static rivalry are essentially identical.     

God's organism? The chick as a model system for memory studies

The young chick is a powerful model system in which to study the biochemical and morphological processes underlying memory formation. Training chicks on a one trial passive avoidance task results in a molecular cascade in a specific brain region, the intermediate medial hyperstriatum ventrale. This cascade is initiated by glutamate release and engages a series of synaptic transients including increased calcium flux, up-regulation of NMDA-glutamate receptors, membrane protein phosphorylations, and the retrograde messenger NO. Expression of immediate early genes c-fos and c-jun precedes the synthesis, glycosylation, and redistribution, >4 hr downstream, of a number of synaptic membrane proteins, notably NCAM and L1. Other membrane proteins required in the early phase of memory formation include the amyloid precursor protein (APP) and apolipoprotein E. There are concomitant increases in dendritic spine number and changes in synaptic structure. Nonsynaptic factors, including corticosterone and BDNF, can modulate retention of the avoidance response, enhancing the salience of otherwise weakly retained memory. These results are discussed in relation to general concepts of memory formation and the spatio-temporal distribution of the putative memory trace.     

Intellectual and perceptual correlates of reading disabilities

This study investigated the psychometric configurations on the WICS and Bender-Gestalt for primary grade pupils with reading problems. Pattern analysis provided virtually no clues as to the nature or extent of reading disability, either for the group as a whole or within a single grade.     

Longitudinal hierarchical linear modeling analyses of California Psychological Inventory data from age 33 to 75: an examination of stability and change in adult personality

Twenty aspects of personality assessed via the California Psychological Inventory (CPI; Gough & Bradley, 1996) from age 33 to 75 were examined in a sample of 279 individuals. Oakland Growth Study and Berkeley Guidance Study members completed the CPI a maximum of 4 times. We used longitudinal hierarchical linear modeling (HLM) to ask the following: Which personality characteristics change and which do not? Five CPI scales showed uniform lack of change, 2 showed heterogeneous change giving an averaged lack of change, 4 showed linear increases with age, 2 showed linear decreases with age, 4 showed gender or sample differences in linear change, 1 showed a quadratic peak, and 2 showed a quadratic nadir. The utility of HLM becomes apparent in portraying the complexity of personality change and stability.     

Friends as Reporters of Children's and Adolescents' Depressive Symptoms

Obtaining information from multiple informants is important when assessing youth depression. Past studies have utilized adults' reports of youths' emotional functioning and aggregate reports from classmates but have not considered close friends as reporters of depressive symptoms. This is surprising given the important roles of friends as companions and confidants. This study investigated relations between friend-reported depressive symptoms and youths' self-reports. From a larger sample of fifth-, seventh-, and ninth-grade participants, self-reports and friend reports of depressive symptoms and friend reports of friendship quality were available for a subset of 367 participants. Significant positive relations emerged between friend reports and self-reports of affective depressive symptoms for girls and youth in high-quality friendships. Relations between friend reports and self-reports were stronger for conduct-related than affective depressive symptoms and reached significance for boys as well as for girls and for youth in low-quality friendships as well as for youth in high-quality friendships. Implications for identifying at-risk youth are discussed.     

Faking and selection: considering the use of personality from select-in and select-out perspectives

The effects of faking on criterion-related validity and the quality of selection decisions are examined in the present study by combining the control of an experiment with the realism of an applicant setting. Participants completed an achievement motivation measure in either a control group or an incentive group and then completed a performance task. With respect to validity, greater prediction error was found in the incentive condition among those with scores at the high end of the predictor distribution. When selection ratios were small, those in the incentive condition were more likely to be selected and had lower mean performance than those in the control group. Implications for using personality assessments from select-in and select-out strategies are discussed.     

Family-strengthening approaches for the prevention of youth problem behaviors

Effective parenting is the most powerful way to reduce adolescent problem behaviors. Dissemination of research-based family interventions has been slow, with most practitioners still implementing ineffective programs. This article reviews 2 federal studies that involved national searches for effective family interventions targeting pre-birth to adolescence: Preventing Substance Abuse Among Children and Adolescents: Family-Centered Approaches (Center for Substance Abuse Prevention, 1998) and Strengthening America's Families (R. Alvarado, K. L. Kumpfer, K. Kendall, S. Beesley, & C. Lee-Cavaness, 2000). Results identified 3 effective prevention approaches, 13 principles of effectiveness, and 35 programs. Recommendations include increased dissemination research on training and technical assistance systems, adoption with fidelity and quality, and gender-, age-, and culturally sensitive adaptations.     

Cross cultural evaluation of smokers risk for panic and anxiety pathology: a test in a Russian epidemiological sample

The present study evaluated the main and interactive effects of level of smoking (cigarettes per day) and anxiety sensitivity (fear of anxiety and anxiety related sensations) in predicting panic and anxiety variables in an epidemiologically-defined sample of smokers from Moscow (n=95). The combination of high levels of anxiety sensitivity and smoking predicted agoraphobic avoidance, but not frequency of panic attacks during the past week. These findings suggest anxiety sensitivity may moderate the relation between level of smoking and prototypical panic psychopathology variables (panic attacks and agoraphobic avoidance) even after controlling for the theoretically-relevant factors of alcohol abuse and negative affect.