VISUAL EVENT-RELATED POTENTIALS INDEX FOCUSED ATTENTION WITHIN BILATERAL STIMULUS ARRAYS .1. EVIDENCE FOR EARLY SELECTION
VISUAL EVENT-RELATED POTENTIALS INDEX FOCUSED ATTENTION WITHIN BILATERAL STIMULUS ARRAYS .1. EVIDENCE FOR EARLY SELECTION
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DOI：
10.1016/0013-4694(90)90138-a
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发表时间：
1990-06-01
期刊：
影响因子：
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通讯作者：
HILLYARD, SA
中科院分区：
文献类型：
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作者：
HEINZE, HJ;LUCK, SJ;HILLYARD, SA
事件相关电位（ERPs）记录从头皮，而受试者参加了双边对称的4个字母（2个在每个视觉半场），以280-520毫秒的时间间隔短暂闪烁的序列。这些序列还包括随机呈现的单边“探针”刺激组成的不相关的酒吧（实验1）或潜在的相关字母对（实验2）。任务是在一次给定的跑动中注意左半区或右半区的字母对，当两个字母彼此匹配时（目标）按下按钮。双侧阵列的ERP包括早期正波（P1，峰值为135毫秒），其在对侧的后头皮部位被增强。这两种类型的探针刺激也引起了更大的早期积极的P1潜伏期范围内（100-200毫秒）时，交付到出席半场，其次是在某些情况下，由一个更长的积极偏转。 值得注意的是，它的缺席是任何迹象的扩大后N1组件（160-200毫秒），这是突出的ERP在以往的研究中，使用随机序列的单边刺激关注领域的刺激。注意场目标引起大的N2和P3（P300）成分，这是大大减少或不存在时，目标发生在无人看管的领域。所观察到的ERP效应解释在视觉空间注意的早期感觉选择。
Event-related potentials (ERPs) were recorded from the scalp while subjects attended to sequences of bilaterally symmetrical arrays of 4 letters (2 in each visual half-field) that were flashed briefly at intervals of 280-520 msec. These sequences also included randomized presentations of unilateral ''probe'' stimuli consisting of irrelevant bars (experiment 1) or potentially relevant letter pairs (experiment 2). The task was to pay attention to the letter pairs in either the left or the right half-field on a given run and to press a button when the two letters matched one another (targets). The ERPs to the bilateral arrays included an early positive wave (P1, peaking at 135 msec) that was enhanced over posterior scalp sites contralateral to the attended visual field. Both types of probe stimulus also elicited a larger early positivity in the P1 latency range (100-200 msec) when delivered to the attended half-field, followed in some cases by a more prolonged positive deflection. Notable for its absence was any sign of an enlarged posterior N1 component (160-200 msec), which was prominent in the ERP to attended-field stimuli in previous studies using randomized sequences of unilateral stimuli. Attended-field targets elicited large N2 and P3 (P300) components, which were greatly reduced or absent when targets occurred in the unattended field. The observed ERP effects were interpreted in terms of early sensory selection during visual spatial attention.