期刊
CEREBRAL CORTEX
卷 17, 期 -, 页码 I118-I124出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhm065
关键词
working memory; attention; visual search; target template
资金
- NEI NIH HHS [R01 EY008890, P30 EY008126, P30-EY08126, R01-EY08890] Funding Source: Medline
- NICHD NIH HHS [P30-HD015052, P30 HD015052] Funding Source: Medline
- NIMH NIH HHS [R01 MH65034, F31 MH12995, R01 MH063001, R01 MH065034, R01 MH12995, F31 MH012995, R01 MH063001-05] Funding Source: Medline
- PHS HHS [F32 NEI015043] Funding Source: Medline
Previous research suggests that target templates are stored visual working memory and used to guide attention during visual search. However, observers can search efficiently even if working memory is filled to capacity by a concurrent task. The idea that target templates are stored in working memory receives support primarily from studies of nonhuman primates in which the target varies from trial to trial, and it is possible that working memory templates are not necessary when target identity remains constant, as in most studies of visual search in humans. To test this hypothesis, we asked subjects to perform a visual search task during the delay interval of a visual working memory task. The 2 tasks were found to interfere with each other when the search targets changed from trial to trial, but not when target identity remained constant. Thus, a search template is stored in visual working memory only when the target varies from trial to trial. These findings suggest that the network of brain areas involved in shifting attention during visual search tasks may be able to operate essentially independently of the anatomical areas that perform visual working memory maintenance of objects, but only if the identity of the visual search target is stable across time.
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