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11.
F Richer C Silverman J Beatty 《Journal of experimental psychology. Human perception and performance》1983,9(3):360-370
Three studies are described in which the task-evoked pupillary response is recorded during simple and disjunctive reactions in order to examine its contribution as a measure of the motoric and cognitive aspects of performance in these tasks. In simple reactions a pupillary dilation began about 1.5 sec before the imperative stimulus and peaked about 1 sec after the stimulus. The rate of dilation was inversely related to the interstimulus interval. In disjunctive reactions, both "Go" and "No-Go" responses elicited significant dilations but the No-Go dilation was smaller than the Go dilation. When the response was delayed 2.5 sec after the discrimination stimulus, the dilation to both Go and No-Go responses was much reduced. The pupillary response related to response selection was estimated at 55% of that associated with motor preparation and execution. The probability of responding was found to affect the amplitude of the dilation to No-Go responses but not that to Go responses. The data point to a significant contribution of preparatory motor processing in No-Go reactions and to an overlap between decisional and motoric processing in disjunctive reactions. 相似文献
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Retention deficits in discrete trial delayed alternation and delayed matching to sample tasks following administration of d-amphetamine have been interpreted to support the view that arousal facilitates the decay of information from shortterm memory (STM) (Kesner, 1973). But since amphetamine causes numerous changes in performance, alternative explanations of the deficit are also plausible. In an attempt to separate drug effects on memory from those on performance, the effects of d-amphetamine on spatial memory in the radial maze were studied in rats. The unusually long span of accurate working memory in this setting permits drug administration within the retention interval as well as prior to the to-be-remembered event (TBRE). In rats tested at a 5-hr retention interval d-amphetamine (2 mg/kg) disrupted retention when given 0.5 hr before or 4.5 hr after the TBRE, but the same treatment 0 or 2 hr after the TBRE or 3 hr before the TBRE was without effect. At a 5-hr retention interval 3 mg/kg d-amphetamine impaired performance if given 2 hr after the TBRE, but not when given 0 hr after the TBRE or 3 hr before the TBRE. However, when the retention interval was lengthened to 7 hr, administering 3 mg/kg d-amphetamine 2 hr after the TBRE did not disrupt performance. The effects of d-amphetamine on spatial memory are best explained in terms of the well established effects of the drug on motor activity and appetite. Similar changes in performance may account for the "memory" impairments observed after amphetamine treatment in other tasks. 相似文献
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Raja Parasuraman Francois Richer Jackson Beatty 《Attention, perception & psychophysics》1982,31(1):1-12
In two experiments, event-related brain potentials (ERPs) were recorded while subjects performed a simultaneous detection and recognition task. Ten subjects listened to pure tones in noise and reported both whether a target tone had occurred (using a four-category confidence rating scale) and whether the target was one of two (Experiment 1) or four (Experiment 2) tones differing in frequency. The amplitudes of three ERP components were found to be differentially related to detection and recognition performance. The early N100 component varied with processing related only to detection, while the late P300 varied with both detection and recognition, and a later slow positive shift varied only with recognition and not with detection. While the latenciee of both N100 and P300 increased for less confident target detections, there were no differences in the latencies of these ERP components between correctly and incorrectly identiffed targets. Recognition performance was above the level expected by chance even when subjects reported that no target had been presented. The results indicate that brain potential components can be used to disclose temporal features of the processing of a stimulus by the nervous system and support the view that detection and recognition are partially independent, concurrent processes in perception. 相似文献
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Philip J. Trocchia Sharon E. Beatty William W. Hill 《Journal of Consumer Behaviour》2006,5(4):304-316
- Previous consumer research suggests that individuals who finance high‐cost items tend to differ from those who lease the same items. Some differences are economic, such as income and wealth, while other dissimilarities involve non‐economic issues such as personal preferences. We employ non‐hierarchical cluster analysis to create consumer segments of motor vehicle lessees and financers based on motives for leasing versus financing and demographics. Five segments were uncovered. Lessees predominate in two categories: budget gourmets and automotive hedonists. Another two categories, utility seekers and basic transportation seekers, are mainly comprised of financers. The final group, mature luxury seekers, consists of a roughly equal mix of lessees and financers. Differences between the segments are addressed here, along with a discussion of findings and implications.
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Jennifer E. C. Lee Deniz Fikretoglu Ann-Renée Blais Kerry A. Sudom Erin Beatty 《Military psychology》2013,25(6):498-505
Identifying the factors associated with mental health services use (MHSU) is an important step in developing strategies to improve services access and delivery. The aims of the present study were to (a) identify personality and individual difference characteristics associated with MHSU intentions within the framework of the Theory of Planned Behavior (TPB) and (b) explore complex relationships that might exist between these characteristics and determinants of MHSU intentions identified in TPB, including attitudes, subjective norms, and perceived behavioral control. Data for 244 Canadian Armed Forces recruits who completed a MHSU questionnaire following mental health training were linked to personality data collected earlier. Multivariate analyses showed that the relationship between agreeableness and MHSU intentions was mediated by instrumental attitudes and subjective norms. The relationship between hardiness and MHSU intentions was mediated by subjective norms and self-efficacy. Findings suggest it may be worthwhile to consider mental health education initiatives to improve MHSU. 相似文献
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Julie A. Testa Alexander I. Tröster Julie A. Fields Angela C. Gleason David P. Salmon William W. Beatty 《Neuropsychology, development, and cognition. Section B, Aging, neuropsychology and cognition》2013,20(3):203-214
Previous studies using the Animals Fluency Test have shown that dementia patients with Alzheimer's disease (AD), Huntington's disease (HD), or Parkinson's disease (PD) produce fewer correct words and have smaller semantic cluster sizes than controls or PD patients without dementia (PDND). Although the number of correct words generated by the patients with AD was positively correlated with mental status, cluster size, surprisingly, was not. To increase word output and increase the reliability of estimates of cluster size, semantic fluency was reexamined using the Supermarket Fluency Task. Overall, patients with HD or PD with dementia (PDD) exhibited reduced cluster sizes compared to older controls or PDND patients, but cluster sizes were only marginally reduced for patients with AD. These effects were evident only for female participants, because the cluster sizes for elderly control men were substantially smaller than those of elderly women. For the female patients with AD, cluster size was correlated with mental status, but the relationship was nonlinear. Cluster size was normal for mildly demented patients with AD, but much reduced for moderately or severely demented participants. In contrast to a previous report, in the present study the proportion of category labels generated was increased for patients with HD with dementia but not for patients with AD. This finding questions one line of evidence that semantic memory stores undergo “bottom-up” degradation in AD. Together with previous results, these findings indicate that semantic cluster size reflects efficiency of access to semantic knowledge which is similarly compromised in subcortical and cortical diseases. 相似文献
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