Dynamics of the spatial scale of visual attention revealed by brain event-related potentials
文献类型：期刊论文
| 作者 | Luo, YJ ; Greenwood, PM; Parasuraman, R; R. Parasuraman
|
| 刊名 | COGNITIVE BRAIN RESEARCH
 |
| 出版日期 | 2001-12-01 |
| 卷号 | 12期号:3页码:371-381 |
| 关键词 | visual attention cue spatial scale of attention visual search event-related potential |
| ISSN号 | 0926-6410 |
| 文献子类 | Article |
| 英文摘要 | 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.; 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. |
| 学科主题 | 认知神经科学 |
| 语种 | 英语 |
| WOS记录号 | WOS:000172984200002 |
| 公开日期 | 2011-08-22 |
| 源URL | [http://ir.psych.ac.cn/handle/311026/5339]  |
| 专题 | 心理研究所_中国科学院心理研究所回溯数据库(1956-2010) |
| 通讯作者 | R. Parasuraman |
| 作者单位 | 1.Catholic Univ Amer, Cognit Sci Lab, Washington, DC 20064 USA 2.Chinese Acad Sci, Inst Psychol, Beijing 100101, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：心理研究所
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