MODULATIONS OF SENSORY-EVOKED BRAIN POTENTIALS INDICATE CHANGES IN PERCEPTUAL PROCESSING DURING VISUAL SPATIAL PRIMING
MODULATIONS OF SENSORY-EVOKED BRAIN POTENTIALS INDICATE CHANGES IN PERCEPTUAL PROCESSING DURING VISUAL SPATIAL PRIMING
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DOI：
10.1037/0096-1523.17.4.1057
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发表时间：
1991-11-01
影响因子：
2.1
通讯作者：
HILLYARD, SA
中科院分区：
文献类型：
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作者：
MANGUN, GR;HILLYARD, SA
对视觉刺激的反应时间（RT）差异作为期望的函数被归因于知觉加工的变化或完全归因于决策和反应标准的转变。为了帮助区分这些相互矛盾的解释，事件相关脑电位（ERPs）被记录到被中心箭头（有效刺激）或未被（无效刺激）阻止的视野位置的侧化闪光中。在简单和选择性RT任务中，有效线索刺激在刺激后90-130 ms时，在覆盖外侧前叶视觉皮层的头皮部位记录的ERP的早期，感觉诱发的P1分量的振幅增强一致。相比之下，仅在选择RT任务条件下，有效线索刺激对随后的N1分量（150 ~ 200 ms）有增强作用。这些电生理学的发现支持了一种模型，即预测预期目标位置的行为影响至少在一定程度上是由于感觉-知觉处理的变化。此外，这些数据提供了关于这些效应背后的神经机制的具体信息。
Reaction time (RT) differences to visual stimuli as a function of expectancy have been attributed to changes in perceptual processing or entirely to shifts in decision and response criteria. To help distinguish between these competing interpretations, event-related brain potentials (ERPs) were recorded to lateralized flashes delivered to visual field locations precued by a central arrow (valid stimuli) or not precued (invalid stimuli). Validly cued stimuli in both simple and choice RT tasks elicited consistent amplitude enhancements of the early, sensory-evoked P1 component of the ERP recorded at scalp sites overlying lateral prestriate visual cortex (90–130 ms poststimulus). In contrast, the subsequent N1 component (150–200 ms) was enhanced by validly cued stimuli in the choice RT task condition only. These electrophysiological findings support models proposing that the behavioral effects of precuing expected target locations are due, at least in part, to changes in sensory–perceptual processing. Furthermore, these data provide specific information regarding the neural mechanisms underlying such effects.