Attentional set modulates visual areas: an event-related potential study of attentional capture

被引:27
作者
Arnott, SR
Pratt, J
Shore, DI
Alain, C
机构
[1] Univ Toronto, Dept Psychol, Toronto, ON M5S 1A1, Canada
[2] Baycrest Ctr Geriatr Care, Rotman Res Inst, Toronto, ON M6A 2E1, Canada
[3] McMaster Univ, Dept Psychol, Toronto, ON, Canada
来源
COGNITIVE BRAIN RESEARCH | 2001年 / 12卷 / 03期
基金
加拿大自然科学与工程研究理事会;
关键词
visual cortex; attentional capture; attentional set; ERP; N1; top-down;
D O I
10.1016/S0926-6410(01)00066-0
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
The present experiment offers event-related potential evidence suggesting that modulation of neural activity in the visual cortex underlies top-down attentional capture by irrelevant cues. Participants performed a covert visual search task where they identified the unique stimulus in a brief, four-location display. Targets defined uniquely by color or onset were run in separate blocks, encouraging observers to adopt different attentional sets in each block. In Experiment 1, a brief, white, abrupt-onset cue highlighted one of the locations 100 or 200 ms prior to the target display. In Experiment 2, the cue display consisted of three white and one red cues simultaneously presented at the four locations. In both experiments, participants were informed that there was no predictive relation between the location of the cue and that of the target. Reaction times were dependent on the location of the preceding cue (i.e. attention was captured), but only in those blocks where the cue shared the uniquely relevant target feature. Evoked potentials over the right hemisphere were modulated during the attention-capturing blocks just prior to the cue's appearance. Additionally, the Nt wave elicited by the cue was enhanced over occipital regions during the attention-capturing blocks. These findings support the notion that attentional capture with peripheral cues is not simply reflexive but is modulated by top-down processes. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:383 / 395
页数:13
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