Effects of perceptual load on startle reflex modification at a long lead interval.
Effects of perceptual load on startle reflex modification at a long lead interval.
复制标题
知觉负荷对长导联间隔下惊吓反射修正的影响。
DOI：
10.1111/j.1469-8986.2006.00420.x
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发表时间：
2006
期刊：
影响因子：
3.7
通讯作者：
Schell,AnneM
中科院分区：
文献类型：
--
作者：
Thorne,GaryL;Dawson,MichaelE;Schell,AnneM
长导联间隔下的惊视眨眼反应抑制被假设发生在当注意力被引导远离惊视刺激的模态时，特别是当注意力被引导到高知觉负荷的刺激时。在对这一假设的检验中，参与者执行了一个延迟匹配样本的任务。在每次试验中，一种模式的点（样本）之后是第二种模式的点（目标）。任务是判断样本和目标图案是否匹配。感知负荷是通过改变样本中点的数量来控制的。听觉惊吓刺激在受试者开始后1200毫秒出现。随着圆点数量的增加，惊吓程度呈线性增加。结果与高知觉负荷条件下引信刺激和惊吓刺激处于不同模态时发生惊吓抑制的假设不一致。
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.