Filtering of Distractors during Visual Search Studied by Positron Emission Tomography

We investigated the sensitivity of brain areas to the presence of filtering operations during overt visual search in crowded displays. Task conditions involved either visual search or predetermined simple eye movements for the detection of target digits. Furthermore, visual displays either contained...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2002-08, Vol.16 (4), p.968-976
Main Authors: Nobre, A.C., Sebestyen, G.N., Gitelman, D.R., Frith, C.D., Mesulam, M.M.
Format: Article
Language:English
Subjects:
Adult
Attention
Brain - diagnostic imaging
Brain - physiology
Humans
Male
Photic Stimulation
Pursuit, Smooth - physiology
Saccades - physiology
Tomography, Emission-Computed
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Summary:We investigated the sensitivity of brain areas to the presence of filtering operations during overt visual search in crowded displays. Task conditions involved either visual search or predetermined simple eye movements for the detection of target digits. Furthermore, visual displays either contained letter foils that required filtering or contained only target digits. Brain imaging using positron emission tomography showed extensive overlap between areas involved in overt visual search and eye movements. Selective filtering of foils affected visual processing in ventral areas associated with object recognition and in primary visual cortex.
ISSN:1053-8119
1095-9572
DOI:10.1006/nimg.2002.1137