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Dynamics of the spatial scale of visual attention revealed by brain event-related potentials
Luo, YJ; Greenwood, PM; Parasuraman, R; R. Parasuraman
2001-12-01
Source PublicationCOGNITIVE BRAIN RESEARCH
ISSN0926-6410
SubtypeArticle
Volume12Issue:3Pages:371-381
AbstractThe temporal dynamics of the spatial scaling of attention during visual search were examined by recording event-related potentials (ERPs). A total of 16 young participants performed a search task in which the search array was preceded by valid cues that varied in size and hence in precision of target localization. The effects of cue size on short-latency (P1 and N1) ERP components, and the time course of these effects with variation in cue-target stimulus onset asynchrony (SOA), were examined. Reaction time (RT) to discriminate a target was prolonged as cue size increased, The amplitudes of the posterior P1 and N1 components of the ERP evoked by the search array were affected in opposite ways by the size of the precue: P1 amplitude increased whereas N1 amplitude decreased as cue size increased, particularly following the shortest SOA. The results show that when top-down information about the region to be searched is less precise (larger cues), RT is slowed and the neural generators of P1 become more active, reflecting the additional computations required in changing the spatial scale of attention to the appropriate element size to facilitate target discrimination. In contrast, the decrease in N1 amplitude with cue size may reflect a broadening of the spatial gradient of attention. The results provide electrophysiological evidence that changes in the spatial scale of attention modulate neural activity in early visual cortical areas and activate at least two temporally overlapping component processes during visual search.; The temporal dynamics of the spatial scaling of attention during visual search were examined by recording event-related potentials (ERPs). A total of 16 young participants performed a search task in which the search array was preceded by valid cues that varied in size and hence in precision of target localization. The effects of cue size on short-latency (P1 and N1) ERP components, and the time course of these effects with variation in cue-target stimulus onset asynchrony (SOA), were examined. Reaction time (RT) to discriminate a target was prolonged as cue size increased, The amplitudes of the posterior P1 and N1 components of the ERP evoked by the search array were affected in opposite ways by the size of the precue: P1 amplitude increased whereas N1 amplitude decreased as cue size increased, particularly following the shortest SOA. The results show that when top-down information about the region to be searched is less precise (larger cues), RT is slowed and the neural generators of P1 become more active, reflecting the additional computations required in changing the spatial scale of attention to the appropriate element size to facilitate target discrimination. In contrast, the decrease in N1 amplitude with cue size may reflect a broadening of the spatial gradient of attention. The results provide electrophysiological evidence that changes in the spatial scale of attention modulate neural activity in early visual cortical areas and activate at least two temporally overlapping component processes during visual search. (C) 2001 Elsevier Science B.V. All rights reserved.
Keywordvisual attention cue spatial scale of attention visual search event-related potential
Subject Area认知神经科学
Indexed BySCI ; SSCI
Language英语
WOS IDWOS:000172984200002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.psych.ac.cn/handle/311026/5339
Collection中国科学院心理研究所回溯数据库(1956-2010)
Corresponding AuthorR. Parasuraman
Affiliation1.Catholic Univ Amer, Cognit Sci Lab, Washington, DC 20064 USA
2.Chinese Acad Sci, Inst Psychol, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Luo, YJ,Greenwood, PM,Parasuraman, R,et al. Dynamics of the spatial scale of visual attention revealed by brain event-related potentials[J]. COGNITIVE BRAIN RESEARCH,2001,12(3):371-381.
APA Luo, YJ,Greenwood, PM,Parasuraman, R,&R. Parasuraman.(2001).Dynamics of the spatial scale of visual attention revealed by brain event-related potentials.COGNITIVE BRAIN RESEARCH,12(3),371-381.
MLA Luo, YJ,et al."Dynamics of the spatial scale of visual attention revealed by brain event-related potentials".COGNITIVE BRAIN RESEARCH 12.3(2001):371-381.
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