排序方式: 共有65条查询结果,搜索用时 10 毫秒
41.
Muhammad Abbas Usman Raja Mansoor Anjum Dave Bouckenooghe 《International journal of psychology》2019,54(5):668-677
Using a diverse and unique sample of triads (N = 191 self, peer, and supervisor reports) from a field survey of two service sector organisations, this study examined the effects of perceived competence (self‐reported) and supervisor‐rated performance ratings on peer‐rated impression management. The study also tested the mediating role of performance in competence–impression management relationships and the moderating role of job satisfaction (self‐reported) in performance–impression management relationships using bootstrapping techniques. The study further examined the conditional indirect effects (i.e., moderated mediation) of perceived competence on impression management. The sample consisted of white collar employees from a government organisation and a leading cellular company in a developing country (i.e., Pakistan). Employees with low perceived competence were more likely to use impression management tactics than were those with high perceived competence. Similarly, poor performance ratings produced high impression management. Moreover, performance mediated the relationship between competence and impression management. The findings also suggest that perceived competence has a negative indirect effect on impression management for those with high levels of job satisfaction. Finally, impression management was highest when performance and satisfaction were low. 相似文献
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Tyler H. Shaw Matthew E. Funke Michael Dillard Gregory J. Funke Joel S. Warm Raja Parasuraman 《Brain and cognition》2013
Transcranial Doppler sonography was used to measure cerebral blood flow velocity (CBFV) in the right and left cerebral hemispheres during the performance of a 50-min visual vigilance session. Observers monitored a simulated flight of unmanned aerial vehicles for cases in which one of the vehicles was flying in an inappropriate direction relative to its cohorts. Two types of vigilance tasks were employed: a traditional task in which observers made button press (“go”) responses to critical signals, and a modification of the traditional task called the Sustained Attention to Response Task (SART) in which “go” responses acknowledged nonsignal events and response withholding (“no-go”) signified signal detection. Signal detections and global CBFV scores declined over time. In addition, fine-grained event-related analyses revealed that the detection of signals was accompanied by an elevation of CBFV that was not present with missed signals. As was the case with the global scores, the magnitude of the transient CBFV increments associated with signal detection also declined over time, and these findings were independent of task type. The results support the view of CBFV as an index of the cognitive evaluation of stimulus significance, and a resource model of vigilance in which the need for continuous attention produces a depletion of information-processing assets that are not replenished as the task progresses. Further, temporal declines in the magnitude of event-related CBFV in response to critical signals only is evidence that the decrement function in vigilance is due to attentional processing and not specific task elements such as the required response format. 相似文献
44.
Two experiments examined the effect of activation of higher-level semantic representations on lower-level perceptual representations. A forced-choice discrimination paradigm was used, a method known to produce repetition blindness (RB) for words unconfounded by memory demands or response bias. In Experiment 1, equivalent reductions in RB (as measured by omission error rate and by d') occurred when successive word pairs were identical in: (1) form, pronunciation, and meaning (both uppercase versions of the same word); (2) pronunciation and meaning but not form (lowercase versus uppercase; lexical identity); and (3) pronunciation, but not form or meaning (homonyms; phonological identity), relative to when the words were unrelated on all dimensions. The RB effect was markedly attenuated, but not eliminated, when the words were semantically related. Similar results were obtained in Experiment 2 using a larger group of subjects. These findings show that higher-order semantic representations can have a top-down influence on judgements based on lower-order perceptual representations. The results are discussed within the framework of a cascade model of object processing in the human brain. 相似文献
45.
Yang Jiang Raja Parasuraman 《Neuropsychology, development, and cognition. Section B, Aging, neuropsychology and cognition》2013,20(2):164-182
ABSTRACT Previously we reported that priming of visual motion perception is reduced in older adults compared to younger adults (Jiang, Greenwood, & Parasuraman, 1999, Psychology and Aging, 14(4), 619; Jiang, Luo, & Parasuraman, 2002b, Neuropsychology, 16(2), 140). To examine the neural mechanisms underlying this age-related effect, event-related brain potentials (ERPs) were recorded during perceptual judgments of motion directions by younger and older adults in two experiments. When judging single-step motion, both younger and older adults evoked significantly larger ERP late positive component (LPC) responses to unambiguous motion compared to LPC responses elicited by ambiguous motion. In contrast, compared to the younger adults, the older adults evoked comparable but delayed ERP responses to single motion steps. In the second experiment the younger and older groups judged the directions of two successive motion-steps (either motion priming or motion reversals). Under short (200–400 ms) stimulus onset asynchrony (SOA), the difference between the ERP responses to priming and reversal conditions was significantly larger for the younger than for the older adults. This study provides the first electrophysiological evidence that brain aging leads to delayed processing of single motion direction and visual motion priming as early as 100 ms in the early visual cortex. Age-related changes in strength and temporal characteristics of neural responses in temporal-parietal regions were particularly pronounced in older adults when successive motion signals are placed closely in time, within 400 ms. 相似文献
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Raja Bahlul 《Philosophical explorations》2013,16(1):104-122
Emotions cannot be fully understood in purely cognitive terms. Nor can they be fully understood as mere feelings with no content. But it has not been easy to give an account of the relation of affect and cognition in a way that preserves the perceived unity of emotional experience. Consequently, emotion theories tend to lean either toward cognitivism, or, alternatively, the view that emotions are basically non-cognitive affairs. The aim of this paper is to argue for an account of emotion as a unity of affect and cognition. Emotions, it will be suggested, do not combine, blend, add, or causally relate cognition to affect, or affect to cognition, but are rather original unities which should be viewed as coordinate with, rather than subordinate to, either cognition, perception, feeling, or any other basic mental category. 相似文献
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Working memory load is critically important for the overall level of performance on vigilance tasks. However, its role in
a key aspect of vigilance—sensitivity decrement over time—is unclear. We used a dual-task procedure in which either a spatial
or a nonspatial working memory task was performed simultaneously with a spatial vigilance task for 20 min. Sensitivity in
the vigilance task declined over time when the concurrent task involved spatial working memory. In contrast, there was no
sensitivity decrement with a nonspatial working memory task. The results provide the first evidence of a specific role for
working memory representation in vigilance decrement. The findings are also consistent with a multiple resource theory in
which separate resources for memory representation and cognitive control operations are differentially susceptible to depletion
over time, depending on the demands of the task at hand. 相似文献
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Jiang Y Luo YJ Parasuraman R 《Neuropsychology, development, and cognition. Section B, Aging, neuropsychology and cognition》2009,16(2):164-182
Previously we reported that priming of visual motion perception is reduced in older adults compared to younger adults (Jiang, Greenwood, & Parasuraman, 1999, Psychology and Aging, 14(4), 619; Jiang, Luo, & Parasuraman, 2002b, Neuropsychology, 16(2), 140). To examine the neural mechanisms underlying this age-related effect, event-related brain potentials (ERPs) were recorded during perceptual judgments of motion directions by younger and older adults in two experiments. When judging single-step motion, both younger and older adults evoked significantly larger ERP late positive component (LPC) responses to unambiguous motion compared to LPC responses elicited by ambiguous motion. In contrast, compared to the younger adults, the older adults evoked comparable but delayed ERP responses to single motion steps. In the second experiment the younger and older groups judged the directions of two successive motion-steps (either motion priming or motion reversals). Under short (200-400 ms) stimulus onset asynchrony (SOA), the difference between the ERP responses to priming and reversal conditions was significantly larger for the younger than for the older adults. This study provides the first electrophysiological evidence that brain aging leads to delayed processing of single motion direction and visual motion priming as early as 100 ms in the early visual cortex. Age-related changes in strength and temporal characteristics of neural responses in temporal-parietal regions were particularly pronounced in older adults when successive motion signals are placed closely in time, within 400 ms. 相似文献
50.
Raja Halwani 《Metaphilosophy》2002,33(5):495-501
This introductory essay offers a general survey of some of the conceptual and normative issues that arise with respect to the philosopher as a public intellectual, arguing that philosophers should be public intellectuals. It also briefly introduces the themes of the essays that follow. 相似文献