SPATIAL GRADIENTS OF VISUAL-ATTENTION - BEHAVIORAL AND ELECTROPHYSIOLOGICAL EVIDENCE
SPATIAL GRADIENTS OF VISUAL-ATTENTION - BEHAVIORAL AND ELECTROPHYSIOLOGICAL EVIDENCE
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DOI：
10.1016/0013-4694(88)90019-3
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发表时间：
1988-11-01
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：
MANGUN, GR;HILLYARD, SA
视觉注意的空间分布进行了研究，通过测量目标检测能力（d“）和事件相关脑电位（ERP）的刺激在不同的距离，从关注的地点。垂直条以随机顺序快速闪烁到3个位置之一：每个横向视野中一个，注视点上方的垂直子午线上一个。受试者在每次1.75分钟跑步的持续时间内保持眼睛注视，同时将他们的注意力集中在3个位置中的1个。 他们的主要任务是检测不常见的，较短的目标酒吧在参加的位置。第二个任务是在两个无人值守的位置中的任何一个位置对较短的目标条做出反应，如果他们“碰巧注意到它们”（而不试图检测它们）。ERP和d“得分都获得了侧场刺激时，他们专门出席（主要任务），以及当注意力集中在中线或相反的领域闪光（次要任务）。随着注意力被引导到离给定的横向刺激越来越远的位置，d“分数和P135和N190波的振幅都逐渐降低。这些结果支持视觉注意空间分布的“梯度”模型。
The spatial distribution of visual attention was investigated by measuring target detectability (d'') and event-related brain potentials (ERPs) to stimuli at varying distances from an attended locus. Vertical bars were flashed rapidly in random order to 1 of 3 locations: one in each of the lateral visual fields and one on the vertical meridian above the fixation point. Subjects maintained eye fixation while directing their attention to 1 of the 3 locations for the duration of each 1.75 min run. Their primary task was to detect infrequent, shorter target bars at the attended location. A secondary task was to respond to shorter target bars at either of the 2 unattended locations if they ''happened to notice them'' (without trying to detect them). ERPs and d'' scores were obtained to the lateral field stimuli both when they were specifically attended (primary task), as well as when attention was focused upon midline or opposite-field flashes (secondary task). Both d'' scores and the amplitudes of the P135 and N190 waves decreased progressively as attention was directed to locations increasingly distant from a given lateral stimulus. These results support ''gradient'' models of the spatial distribution of visual attention.