VISUAL EVENT-RELATED POTENTIALS INDEX FOCUSED ATTENTION WITHIN BILATERAL STIMULUS ARRAYS .2. FUNCTIONAL DISSOCIATION OF P1 AND N1 COMPONENTS
VISUAL EVENT-RELATED POTENTIALS INDEX FOCUSED ATTENTION WITHIN BILATERAL STIMULUS ARRAYS .2. FUNCTIONAL DISSOCIATION OF P1 AND N1 COMPONENTS
复制标题
DOI：
10.1016/0013-4694(90)90139-b
复制
发表时间：
1990-06-01
期刊：
影响因子：
--
通讯作者：
HILLYARD, SA
中科院分区：
文献类型：
--
作者：
LUCK, SJ;HEINZE, HJ;HILLYARD, SA
当12名受试者注视视觉显示器的左半球或右半球，同时注视一个中心点时，记录下事件处理电位（ERPs）。刺激分别呈现在左或右视野（单侧刺激）或同时呈现在两个视野（双侧刺激）。在不同的条件下，刺激序列仅包含双侧刺激，仅包含单侧刺激，或单侧和双侧混合刺激。双侧刺激引起的阳性增强持续时间约为75 - 250毫秒，在对侧的后电极部位最大。这种与注意力相关的阳性反应的早期阶段似乎是外源性P1成分的增强。相比之下，后侧P1和N1成分在单侧刺激下均增强。此外，当前一个刺激中含有被注意领域的元素时，N1注意效应减弱。结果表明，实验中N1和P1成分的调节代表了视觉空间注意的不同方面：N1可能代表了对任务相关刺激的注意力导向，而P1可能代表了对呈现在注意力已经集中的位置的物品的早期感觉加工的促进。
Event-treated potentials (ERPs) were recorded from 12 subjects as they attended to the left or right hemifield of a visual display while fixating a central point. Stimuli were presented to the left or right visual fields on separate trials (unilateral stimuli) or to both fields simultaneously (bilateral stimuli). In different conditions, the stimulus sequences contained only bilateral stimuli, only unilateral stimuli, or a mixture of unilateral and bilateral stimuli. Bilateral stimuli elicited an enhanced positivity lasting from about 75 to 250 msec that was largest at posterior electrode sites contralateral to the attended hemifield. The early phase of this attention-related positivity appeared to be an enhancement of the exogenous P1 component. In contrast, both the posteriors P1 and N1 components were enhanced in response to attended unilateral stimuli. Moreover, the N1 attention effect was reduced when the preceding stimulus contained elements in the attended field. It was concluded that modulations of the N1 and P1 components in these experiments represent different aspects of visual spatial attention: N1 may represent the orienting of attention to a task-relevant stimulus, whereas P1 may represent a facilitation of early sensory processing for items presented to a location where attention is already focused.