An ERP study of sustained spatial attention to stimulus eccentricity

被引:30
作者
Eimer, M [1 ]
机构
[1] Univ London Birkbeck Coll, Dept Psychol, London WC1E 7HX, England
基金
英国医学研究理事会;
关键词
visual-spatial attention; sustained attention; event-related potentials; Nd; spatial selectivity;
D O I
10.1016/S0301-0511(00)00028-4
中图分类号
B84 [心理学];
学科分类号
04 ; 0402 ;
摘要
Effects of attention on event-related brain potentials (ERPs) were measured when subjects kept sustained attention focused on ring-shaped regions of visual space to detect infrequently presented targets at a given eccentricity. In line with a previous study that employed a trial-by-trial cueing paradigm, no modulations of sensory-evoked P1 and N1 components were found. This suggests that attentional selectivity in complex spatial selection tasks is primarily located at post-perceptual processing levels. Enhanced negativities for attended as compared to unattended stimuli were present between 220 and 380 ms post-stimulus and were followed by an enlarged positivity for attended stimuli in the P3 time range. These effects reflected the distribution of attention in visual space, in part consistent with 'attentional gradient' and 'zoom-lens' models. However, ERPs also suggested the presence of selective mechanisms that exclude irrelevant stimuli located between two simultaneously attended areas. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:205 / 220
页数:16
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