Thorne Gary L, Dawson Michael E, Schell Anne M
Department of Psychology, University of Southern California, Los Angeles, California 90089-1061, USA.
Psychophysiology. 2006 Sep;43(5):498-503. doi: 10.1111/j.1469-8986.2006.00420.x.
Inhibition of the startle eyeblink response at long lead intervals has been hypothesized to occur when attention is directed away from the modality of the startle stimulus, particularly if attention is directed to a stimulus of high perceptual load. In a test of this hypothesis, participants performed a delayed-matching-to-sample task. On each trial a pattern of dots (the sample) was followed by a second pattern of dots (the target). The task was to say whether the sample and target patterns matched. Perceptual load was manipulated by varying the number of dots in the sample. Auditory startle stimuli were presented 1200 ms after onset of the samples. A linear increase in startle magnitude was found as the number of dots increased. The results are not consistent with the hypothesis that startle inhibition occurs when the lead and startle stimuli are in different modalities under conditions of high perceptual load.
有人提出，当注意力从惊吓刺激的模态转移开时，尤其是如果注意力指向高感知负荷的刺激时，在长超前间隔下对惊吓眨眼反应的抑制就会发生。在对这一假设的测试中，参与者执行了一个延迟匹配样本任务。在每次试验中，先是一组点的图案（样本），随后是另一组点的图案（目标）。任务是说出样本图案和目标图案是否匹配。通过改变样本中点的数量来操纵感知负荷。在样本出现1200毫秒后呈现听觉惊吓刺激。发现随着点的数量增加，惊吓幅度呈线性增加。这些结果与以下假设不一致：即在高感知负荷条件下，当超前刺激和惊吓刺激处于不同模态时会发生惊吓抑制。
