Context processing in older adults: evidence for a theory relating cognitive control to neurobiology in healthy aging.

A theory of cognitive aging is presented in which healthy older adults are hypothesized to suffer from disturbances in the processing of context that impair cognitive control function across multiple domains, including attention, inhibition, and working memory. These cognitive disturbances are postulated to be directly related to age-related decline in the function of the dopamine (DA) system in the prefrontal cortex (PFC). A connectionist computational model is described that implements specific mechanisms for the role of DA and PFC in context processing. The behavioral predictions of the model were tested in a large sample of older (N = 81) and young (N = 175) adults performing variants of a simple cognitive control task that placed differential demands on context processing. Older adults exhibited both performance decrements and, counterintuitively, performance improvements that are in close agreement with model predictions.     

Sex differences in levels of tolerance and attribution of blame for sexual harassment on a university campus

Although the issue of sexual harassment on college campuses has been discussed in the literature for the last five years, little attention has been paid to sex differences in levels of tolerance and attribution of blame in harassment. The current survey, based on a random sample of faculty, students, and staff at a large southern university, details sex differences in definitions of harassment, in attitudes toward causes, in attitudes toward romantic relationships between faculty and students, and in attitudes toward university policy. The authors suggest that sex differences reflect differing perceptions by men and women of their own self-interests within the university, and the organizational environment. Attention is also directed to the explanatory power of attribution theory.     

Difficulties and patterns of social support of mature college students in Hong Kong: Implications for student guidance and counselling services

The extent and nature of the difficulties faced by mature college students in a university in Hong Kong were examined. Who provided which types of support in which aspects of the lives of mature students was investigated. The results showed that time constraints were a major concern of many such students. Differences were found in the problems experienced in different modes of study and with different marital statuses. Spouses were support generalists who provided all types of support to their mature student partners, while lovers, friends and family members were support specialists who provided specific types of social support. The findings lend support to the hypothesis that the more sufficient the perceived social support received by mature students, the less the degree of difficulty they experience in their lives. Implications for service approach and for the provision of services are discussed, and recommendations on how to improve services are made.     

Effects of Environmental Uncertainty and Social Value Orientation in Resource Dilemmas

This study investigated the relationship between environmental uncertainty and social value orientation in a replenishable resource dilemma paradigm. One hundred seventy-two undergraduates harvested units from a common resource pool over 20 trials. Two levels of social value orientation (cooperative, noncooperative) were crossed with two levels of replenishment rate uncertainty (low, high). As predicted, noncooperators harvested significantly more resources than cooperators and high uncertainty subjects harvested more resources than low uncertainty subjects. The primary finding was the hypothesized three-way interaction among social value orientation, environmental uncertainty, and trials: Social value orientation moderated harvest decisionsonlyunder conditions of high uncertainty during the middle series of harvest trials. Noncooperators increased their harvests during this period, while cooperators harvested less and held their harvests constant across these trials. These results demonstrate that systematic individual differences exist in decision makers' responses to high environmental uncertainty. We suggest that social value orientation may exert its effect by influencing the scanning and processing of goal-relevant cues in this decision environment.     

A model of a psychological service for adults in a formal educational setting

This article describes the development and operation of a psychological service addressing the needs of adults in a formal educational setting. The structure and content of the service differs significantly from that historically available to children or adolescents in Irish schools. The major elements in the service - induction course, workshops, personal growth groups, and individual counselling - are detailed. The present research builds on an earlier investigation by the same authors into the needs of adults in full-time education at Pearse College, Dublin.     

The role of masculine gender role stress in expressivity and social support network factors

This study examined the relationship of masculine gender roles stress (MGRS) to nonverbal and verbal expressivity in positive and negative emotional dyadic role-play situations. The relationship between masculine gender role stress and emotion-focused social support was also explored. Male subjects were differentiated by their appraisals of gender-related situations as stressful; they were rated on nonverbal facial expression and global verbal expressivity in positive and negative emotional situations. It was demonstrated that (a) all subjects were less nonverbally and verbally expressive in situations requiring positive emotional expression than in situations requiring negative emotional expression; (b) high MGRS subjects were less nonverbally expressive than low MGRS participants in both types of situations; (c) however, the high MGRS subjects were less verbally expressive than the lows only under emotionally positive conditions; and (d) while high MGRS subjects did not have smaller social support networks than the lows, they reported less satisfaction with their social support systems. Results were discussed in terms of gender roles and stress-buffering implications.     

Reading skill and the use of orthographic knowledge by Mature Readers

Summary Butler and Hains (1979) found individual differences in the effect of word length on RT in word naming and lexical-decision tasks; subjects scoring high on a vocabulary test were much less affected by word length than subjects with low scores. The present study attempted to determine whether such differences could be due to differences in the use of intraword structure, since word recognition has been linked, both empirically (Mason, 1978; Scheerer-Neumann, 1981) and theoretically (Mewhort & Campbell, 1981) to the use of orthographic redundancy. In Experiment 1, subjects were shown tachistoscopically presented letter strings varying in approximation to English. High vocabulary subjects were more capable of capitalizing on the redundancy with the higher-order approximations. Experiment 2 then established that performance on the vocabulary test was correlated with reading skill, measured by the Nelson-Denny Reading Test, and that skilled readers were more sensitive to the syllable structure in words. In the experiment, subjects were shown eight-letter words presented as three separate word units which either matched or violated syllable boundaries in the word. Skilled readers were more sensitive to the difference between syllable and nonsyllable units than were less skilled readers. The results obtained by Butler and Hains appear to reflect differences in reading skill and the efficiency of letter sequence parsing prior to word recognition.     

论数学能力的研究与认知理论的关系

本文对关于数学能力的实质的心理学研究作了历史的回顾,其中包括心理计量学、认知科学和心理学中的认知发展等几个领域的研究工作。文中揭示了在这几个领域的研究中存在着的几个共同问题。作者认为需要假借这些不同的研究领域中的研究方法,创造新的信息加工的方法以揭示数学能力及其发展的实质。