Vidnyánszky Z  Blaser E  Papathomas TV 《Trends in cognitive sciences》2002,6(4):157-161

The perceived global motion of a stimulus depends on how its different local motion-direction vectors are distributed in space and time. When they are explicitly co-localized, as in the case of locally paired motion, competitive motion integration mechanisms produce a unitary global motion direction determined by their vector average. During motion aftereffects induced by simultaneous adaptation to multiple motion directions, just as in the case of locally paired motion, different directional signals originate simultaneously from exactly the same position in space. Therefore, the perceived global motion direction during motion aftereffects results from local vector averaging of the co-localized motion-direction signals induced by adaptation.  相似文献   

    

Kéri S  Janka Z  Benedek G  Aszalós P  Szatmáry B  Szirtes G  Lörincz A 《Trends in cognitive sciences》2002,6(3):132-136

Recent studies indicate that category learning is mediated by multiple neuronal systems. It has been shown that patients with marked impairments in executive functions, explicit memory and procedural learning can categorize the exemplars and prototype of a previously trained category. Simple, self-organizing neuronal networks can explain prototype learning and related dysfunctions in Alzheimer's disease, and provide a model of how prototype learning is mediated by circumscribed mechanisms in the visual cortex.  相似文献   

    

Gün R Semin 《European journal of social psychology》2000,30(5):595-612

The aim of this paper is to identify the functions of social cognition in a communication context. It is argued that social cognition is for the regulation of adaptive action and makes use of external devices (e.g. language) to implement action. First, the complexity of communication as a social achievement is discussed to prepare the ground for examining the link between language, cognition and communication. The implementational devices (language) of social cognition are addressed next. On the basis of these considerations a message‐modulation model is proposed to conceptualize the interplay between language, cognition, motivation and communication. The application of this model to research on the transmission and maintenance of stereotypes illustrates the types of open research issues and directions that may be possible routes for future work. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

    

Antón C 《International journal of psychology》2009,44(3):187-194

Dysfunctions in role performance have been associated with a large number of consequences, almost always negative, which affect the well-being of workers and the functioning of organizations. An individual's experience of receiving incompatible or conflicting requests (role conflict) and/or the lack of enough information to carry out his/her job (role ambiguity) are causes of role stress. According to previous theory, role ambiguity and conflict decrease workers' performance and are positively related to the probability of workers leaving the organization. Job satisfaction refers to a positive evaluation of a job, while organizational commitment refers to an employee's attachment to the organization. The affective dimensions of organizational commitment and job satisfaction are considered to be important predictors of turnover intention, absenteeism, and job performance. In the literature, role conflict and ambiguity have been proposed as determining factors of workers' job satisfaction and their commitment towards the organization. The role of job satisfaction and organizational commitment were analysed as variables that should mediate between role ambiguity and conflict and employees' behaviour. The hypotheses were confirmed by means of path analysis carried out with data obtained from a sample of Spanish blue-collar workers employed by a bus company and a water supply company. Role stressors were negatively related to affective commitment mediated through job satisfaction. Affective commitment to the organization exerted a positive influence on performance and reduces the withdrawal behaviour analysed— intention to leave and absenteeism—although the strongest predictor of intention to leave was, in this study, job satisfaction.  相似文献   

    

Bevilaqua LR  Bonini JS  Rossato JI  Izquierdo LA  Cammarota M  Izquierdo I 《Neurobiology of learning and memory》2006,85(2):192-197

In this study, we analyzed the participation of the entorhinal cortex in extinction of a learned aversive response. Rats with infusion cannulae aimed to the entorhinal cortex were trained in a one-trial step-down inhibitory avoidance task (IA) and submitted to four consecutive daily test sessions without the footshock, a procedure that induced extinction of the conditioned response in control animals. When infused into the entorhinal cortex immediately after the first extinction session at doses able to block consolidation of IA memory, the NMDA receptor antagonist, AP5 (25 nmol/side), the inhibitor of protein synthesis anisomycin (300 nmol/side) and the inhibitor of CaMKII, KN-93 (10 nmol/side), but not the MEK1/2 inhibitor PD-98059 (5 nmol/side) hindered extinction of the IA response. The same results were obtained when the interval between the first and second test session was 48 instead of 24h. The data indicate that normal functionality of the NMDA receptors, together with CaMKII activity and protein synthesis are necessary in the entorhinal cortex at the time of the first test session to generate extinction. Our results also suggest that the ERK1/2 pathway does not play a role in this process.  相似文献   

    

K. Freepers&#x;n 《The Journal of Humanistic Counseling》1988,26(4):191-191

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Jesús L. Megías  Estrella Ryan  Joaquín M. M. Vaquero  Bettina Frese 《Applied cognitive psychology》2007,21(1):117-130

According to most post‐traumatic stress disorder (PTSD) theories, memory mechanisms are involved in its development and maintenance. However, the specific memory characteristics responsible for this disorder are still not well known. In the present study, 210 participants having reported at least one traumatic experience were assigned to a PTSD or to a non‐PTSD symptom profile group. Both groups rated their memories for their most traumatic and intense positive life events. We observed that the traumatic memories of PTSD profile participants were more clear, detailed and judged as significant compared with those of the non‐PTSD profile group. However, participants in the first group acknowledged having more difficulties putting their traumatic memories into words and controlling these remembrances. These differences were absent in their positive memories. Additionally, clear relationships emerged between memory ratings and PTSD symptoms measures. Results are discussed according to fragmentation and superiority views of traumatic memories in PTSD. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

    

Ingrid M. Cordn  Carrie L. Saetermoe  Gail S. Goodman 《Applied cognitive psychology》2005,19(3):249-266

This study examined the effectiveness of teaching young children a set of social conversational rules as a method of reducing errors in children's memory reports. Forty children (aged 3 to 6 years) interacted with a confederate ‘teaching assistant.’ Three conversational rules were examined as possible means of decreasing inaccuracies. For comparison purposes, three placebo rules were also developed. To test the limitations of teaching young children a set of conversational rules, three interview styles (neutral, repetitive, accusatory) were used. Results indicated that children who received all three target rules provided a smaller proportion of incorrect responses than did children who received fewer target rules or than children in a placebo control group, regardless of interview style. Theoretical and applied issues are discussed. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

    

Fréaadéric Slama MD  Bénédicte Dehurtevent MD  Jean‐Daniel Even MD  Aimé Charles‐Nicolas MD  Nicolas Ballon MD  PhD  Rémy Slama MD 《Suicide & life-threatening behavior》2008,38(6):720-727

Research on vulnerability factors among ethnic groups, independent of primary psychiatric diagnosis, may help to identify groups at risk of suicidal behavior. French African Caribbean general psychiatric patients (N = 362) were recruited consecutively and independently of the primary psychiatric diagnosis. Demographic and clinical characteristics and lifetime history of suicide attempts were recorded. Sixty‐five patients (18%) had a history of at least one suicide attempt. Presence of professional qualifications, children, poor social contacts, treatment with benzodiazepine at inclusion, and poor treatment compliance were all associated with a lifetime history of suicide attempts.  相似文献   

    

Göran Hermerén 《Metaphilosophy》2005,36(5):552-567

Abstract: In this article I focus on some of Joseph Margolis's contributions to medical ethics. I first discuss some of Margolis's normative and metaphysical views on death and abortion, particularly in his early work Negativities , as well as some of his metaphysical assumptions. Then these views and assumptions are related to his theory of persons and, by implication, his theory of culture, set forth in a number of later works. In the course of the discussion, I call attention to some controversial issues of today, such as embryonic stem cell research and the creation of embryos for the sole purpose of research, and ask for Margolis's views on them, given his earlier contributions and assumptions. Finally, I comment on his relativism and his program for research in aesthetics and ethics.  相似文献