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Lester E. Krueger Ronald G. Shapiro 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1981,33(3):241-265
Specific intertrial effects (repetition effects) and general intertrial effects (refractoriness or persisting attention to the preceding trial) were studied with the same-different judgment task, which dissociates the effects of response repetition and stimulus repetition. Response repetition alone did not facilitate performance. Stimulus repetition did aid performance, but mainly when accompanied by response repetition. Subjects tended to avoid the normal comparison process by using the (invalid!) “bypass rule” (Fletcher and Rabbitt, 1978): repeat the response if the stimulus or some aspect thereof (letter contents, size, position) is repeated from the preceding trial, otherwise change the response. As to general effects, partial refractoriness was evident at response execution, but not at earlier processing stages. Mean RT increased, but errors decreased, as the response-stimulus interval (RSI) between trials decreased. Presenting a new letter pair immediately after the preceding response produced a delay, but subjects used the waiting time, while the response system recovered or was redirected to the present trial, to improve the accuracy of their decision. 相似文献
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David Lester 《Suicide & life-threatening behavior》1997,27(3):304-310
This article reviews 14 studies examining whether suicide prevention centers have a preventive effect on suicide rates. Seven studies were identified that provide some support for a preventive effect, one found an increase in the suicide rates, and six failed to find any significant effects (either preventive or facilitative). The studies' different methodologies are reviewed, and limitations on the authors' conclusions pointed out. The conclusion of this article is that the evidence provides support for a preventive effect from suicide prevention centers, albeit small and inconsistently found. 相似文献
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