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31.
Several experiments have found complete retention of conditioned suppression when overall suppression to the signal for shock was measured. The present experiment examined retention of conditioned suppression but did so with a paradigm that produced temporal discrimination of shock occurrence. Nine rats were exposed to a flashing light signal of 5-min duration that always terminated with a shock. After several months, a temporal discrimination was well established, as shown by maximum suppression toward the end of the signal period. After remaining in the home cage for 25 days, the rats were again subjected to the conditioning procedure. The overall level of suppression remained the same but the temporal discrimination was not observed. 相似文献
32.
Temporal integration of pairs of brief blink-eliciting acoustic and cutaneous stimuli was investigated to determine if there was integration of stimuli from different modalities. Reflexes elicited by a tone burst or by a brief electrical shock to the supraorbital nerve followed by a second tone burst or shock at short stimulus onset asynchronies (SOAs) were larger and faster than control reflexes elicited by a single stimulus identical to the lead stimulus of the stimulus pairs. Reflex amplitude was augmented at longer SOAs where there was no effect on latency. Temporal integration was evident for all stimulus pairs, showing that it is due, at least in part, to processes that occur outside specific sensory pathways. Heterogeneous stimulus pairs produced greater reflex enhancement than did homogeneous stimulus pairs. This finding was examined further in Experiment 2, which showed that reflex enhancement with pairs of acoustic pulses was unaffected by the frequency of the second stimulus, suggesting that sensory masking was not acting to suppress reflex expression with acoustic pulse pairs. Integration of reflexogenic acoustic stimuli shown in the blink reflex is restricted to shorter intervals than is integration of acoustic stimuli shown by psychophysical procedures, suggesting that the two methods reflect different aspects of stimulus processing. Integration of reflexogenic stimuli may result from summation of activity associated more directly with reflex expression than with perceptual awareness. 相似文献
33.
Kenneth R. Hammond Gabriella Bartoli Bonaiuto Claude Faucheux Serge Moscovici Werner D. Frhlich C. Richard B. Joyce Giulio Di Majo 《International journal of psychology》1968,3(1):1-12
Etude comparative du conflit cognitif interpersonnel en Europe occidentale et aux Etats-Unis. — La recherche a été menée conjointement dans divers pays européens (Grande-Bretagne, France, Italie, RFA) et aux Etats-Unis, selon la même procédure. On induit des différences cognitives détetminées entre les 2 membres d'un groupe, en les entraînant différemment (ce dont ils ne sont pas conscients) dans une tâche d'apprentissage portant sur des problèmes politiques; il s'ensuit un conflit quand on réunit les deux sujets et qu'on leur demande d'aboutir à des solutions communes. Les résultats montrent que — a) les différences cognitives ne sont pas réduites en Europe alors qu'elles le sont, lentement, aux Etats-Unis; — b) les sujets européens aboutissent moins souvent que les sujets américains à des solutions de compromis; — c) les européens réagissent différemment à l'idée de « Contrôle de l'Etat ». Ce type de recherche peut être utilisé pour étudier le conflit cognitif sur une base interculturelle; les résultats font apparaître des problèmes importants qui n'ont pas encore été étudiés. 相似文献
34.
35.
Somatosensory potentials evoked by brief low-intensity electrical pulses delivered separately to the left and right index fingers were recorded from the scalp over the posterior half of the contralateral hemisphere in normal human subjects. In two experiments it was found that the scalp areas enclosed by 75 and 90% of maximum-amplitude isopotential contour lines of the early cortically generated complexes were more restricted over the left hemisphere. This asymmetrical evoked potential distribution supports the proposal by Semmes from her observations of brain-damaged patients that elementary somatosensory representation is focal in the left hemisphere and diffuse in the right. 相似文献
36.
37.
Baumert A Sinclair C MacLeod C Hammond G 《Cognitive, affective & behavioral neuroscience》2011,11(3):404-412
Emotion is assumed to facilitate the preparation of behavioral responses to environmental stimuli. In the present study, we
examined whether emotional processing induced by spoken scenarios of positive and negative content, related to the self or
to other people, modulates corticospinal excitability. Motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation
(TMS) in 20 volunteers indicated that processing of negative emotional content increased MEP amplitude, regardless of the
perspective taken in the scenario. By contrast, positive emotional processing did not reliably alter MEP amplitude. These
results provide the first TMS evidence that the auditory processing of emotionally negative information triggers action preparation. 相似文献
38.
The Computers in Teaching Initiative (CTI) Centre for Psychology has been promoting the use of computers in psychology education for the last 5 years. The advent of the Internet and ubiquitous access to the World-Wide Web has the potential to revolutionize the way the teaching and learning of psychology can be supported. This paper describes how we are using the Web to support psychology education through information dissemination, through the provision of teaching resources, and through facilities for communication. 相似文献
39.
Krahn GL Hammond L Turner A 《Mental retardation and developmental disabilities research reviews》2006,12(1):70-82
People with ID represent approximately 2% of the population and, as a group, experience poorer health than the general population. This article presents recent conceptualizations that begin to disentangle health from disability, summarizes the literature from 1999 to 2005 in terms of the cascade of disparities, reviews intervention issues and promising practices, and provides recommendations for future action and research. The reconceptualization of health and disability examines health disparity in terms of the determinants of health (genetic, social circumstances, environment, individual behaviors, health care access) and types of health conditions (associated, comorbid, secondary). The literature is summarized in terms of a cascade of disparities experienced by people with ID, including a higher prevalence of adverse conditions, inadequate attention to care needs, inadequate focus on health promotion, and inadequate access to quality health care services. Promising practices are reviewed from the perspective of persons with ID, providers of care and services, and policies that influence systems of care. Recommendations across multiple countries and organizations are synthesized as guidelines to direct future action. They call for promoting principles of early identification, inclusion, and self-determination of people with ID; reducing the occurrence and impact of associated, comorbid, and secondary conditions; empowering caregivers and family members; promoting healthy behaviors in people with ID; and ensuring equitable access to quality health care by people with ID. Their broadscale implementations would begin to reduce the health disparity experienced by people with ID. 相似文献
40.
John A. Groeger David Field Sean M. Hammond 《International journal of psychology》1999,34(5-6):359-363
This study, conducted on a sample of 403 adult subjects, set out to explore the relationships between measures of digit span (forward and reversed), motor and spatial span, and their dependence on a broad range of measures of cognitive function. The results revealed that measures of digit span are closely related, as are measures of motor and spatial span, but these pairs of memory span measures are relatively independent of each other. Furthermore, reverse digit span, motor span, and spatial span appear to rely on what might be regarded as intellectual or executive cognitive functions. As such, the results provide little support for accounts of serial recall, which suggest that order and/or item information are more adequately modelled in a modality-independent form. 相似文献