Event-related fMRI of category learning: differences in classification and feedback networks

Eighteen healthy young adults underwent event-related (ER) functional magnetic resonance imaging (fMRI) of the brain while performing a visual category learning task. The specific category learning task required subjects to extract the rules that guide classification of quasi-random patterns of dots into categories. Following each classification choice, visual feedback was presented. The average hemodynamic response was calculated across the eighteen subjects to identify the separate networks associated with both classification and feedback. Random-effects analyses identified the different networks implicated during the classification and feedback phases of each trial. The regions included prefrontal cortex, frontal eye fields, supplementary motor and eye fields, thalamus, caudate, superior and inferior parietal lobules, and areas within visual cortex. The differences between classification and feedback were identified as (i) overall higher volumes and signal intensities during classification as compared to feedback, (ii) involvement of the thalamus and superior parietal regions during the classification phase of each trial, and (iii) differential involvement of the caudate head during feedback. The effects of learning were then evaluated for both classification and feedback. Early in learning, subjects showed increased activation in the hippocampal regions during classification and activation in the heads of the caudate nuclei during the corresponding feedback phases. The findings suggest that early stages of prototype-distortion learning are characterized by networks previously associated with strategies of explicit memory and hypothesis testing. However as learning progresses the networks change. This finding suggests that the cognitive strategies also change during prototype-distortion learning.     

Taxometric Investigation of PTSD: data from two nationally representative samples

Current psychiatric nosology depicts posttraumatic stress disorder (PTSD) as a discrete diagnostic category. However, only one study has examined the latent structure of PTSD, and this study suggested that PTSD may be more accurately conceptualized as an extreme reaction to traumatic life events rather than a discrete clinical syndrome. To build on the existing literature base, the present research examined the latent structure of posttraumatic stress reactions by applying three taxometric procedures (MAXEIG, MAMBAC, and L-Mode) to data collected from large nationally representative samples of women (ns = 2684 and 3033) and adolescents (n = 3775). Results consistently provided evidence for a dimensional PTSD solution across samples and statistical procedures. These findings have important implications for the theory, assessment, and investigation of posttraumatic stress reactions.     

Classes,collections, and distinctive features: Alternative strategies for solving inclusion problems

This study analyzed the strategies that children ages 5 through 8 years used on two modified versions of Inhelder and Piaget's (The early growth of logic in the child. New York: Norton, 1964) class inclusion task. In two experiments, children were tested on Wilkinson's (Cognitive Psychology, 1976, 8, 64–85) “percept” inclusion task in which distinctive features marked both supraordinate and subclasses. It was hypothesized that children who fail standard Piagetian inclusion tasks succeed on the “percept” task by counting and comparing mutually exclusive features rather than using features as markers for classes and subclasses. The hypothesis was supported by children's performances on “percept” tasks in which solutions based on feature counting conflicted with solutions based on consideration of class inclusion relations. In two other experiments, children answered part-whole and part-part comparison questions in which both terms were described as classes and/or subclasses, or in which one of the two terms was described as a collection (e.g., a bunch of grapes). These experiments contrasted Markman and Seibert's (Cognitive Psychology, 1976, 8, 561–577) “organization” hypothesis that the greater psychological integrity of collections facilitates reasoning on part-whole comparison problems with the hypothesis that the faciltative effect results from the “large number” connotation of collective nouns. Results on collection problems in which parts were described as collections supported the “large number” hypothesis. Results were discussed in terms of their implications for Piaget's theory.     

"I Know Just How You Feel": The Validity of Healthy Women's Perceptions of Breast-Cancer Patients Receiving Treatment

The accuracy of healthy women's perceptions of how breast-cancer patients cope with treatment was assessed in this study. Standardized questionnaires measuring distress, coping, and illness perceptions were completed by 78 women undergoing postsurgical treatment for primary breast cancer. The patients' responses were then compared with assessments made by a matched community sample. The results showed a marked incongruity between healthy women's perceptions and actual patients' experiences of the disease and its treatment. Community women overestimated patients' distress, perceived the consequences of breast cancer to be more severe, and were more likely to believe that patients used denial and disengagement strategies. The discrepancy in findings has implications for the appropriateness of the support offered to patients by healthy women.     

Empathic accuracy and accommodative behavior among newly married couples

An established method for assessing empathic accuracy was used to examine the consequences of accurate understanding during the early years of marriage. Structural equation modeling analyses simultaneously examined within–individual and across–partner associations among variables (actor effects and partner effects). During the first year of marriage, actor effects and partner effects were observed for two presumed consequences of empathic accuracy—accommodative behavior and couple well–being. Actor effects, partner effects, or both were observed for three possible determinants of empathic accuracy—commitment level, partner perspective–taking, and psychological femininity. Levels of empathic accuracy reliably declined following the first year of marriage, as did the strength of the above–noted associations with empathic accuracy.     

Do Villages Remain Christian Communities?

A house-to-house survey of a rural English community of around 400 people resulted in 100 completed questionnaires. Respondents were asked to rate a series of questions on a five-point scale to indicate whether they saw themselves as Christians, whether they considered themselves regular churchgoers, and other related indices of religiosity. The results show the sample to be more Christian than the national average in respect of both avowed belief and church attendance. This would seem to confirm that Christianity remains strongest in the countryside and that the community model of the church survives in rural areas. This in turn raises questions about the style of ministry most appropriate for rural parishes in England and Wales.     

Internet addiction: current status and implications for employees

The Internet is a new technology that has influenced the world and has provided many benefits to its users. At the same time, however, this influence has had negative ramifications. Some people are becoming preoccupied with the Internet, are unable to control their use of this technology, and are jeopardizing their employment and personal relationships. Internet addiction has been proposed as an explanation for uncontrollable, damaging use of this technology. Warning signs that an employee is having difficulty controlling his or her Internet use are reviewed. In addition, suggestions are proposed for managers to aid them in helping their employees with this problem.