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Comparing segmentation by time and by motion in visual search: An fMRI investigation

Dent, K and Allen, H and Humphreys, GW (2011) 'Comparing segmentation by time and by motion in visual search: An fMRI investigation.' Journal of Cognitive Neuroscience, 23 (7). 1710 - 1722. ISSN 0898-929X


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Brain activity was recorded while participants engaged in a difficult visual search task for a target defined by the spatial configuration of its component elements. The search displays were segmented by time (a preview then a search display), by motion, or were unsegmented. A preparatory network showed activity to the preview display, in the time but not in themotion segmentation condition. A region of the precuneus showed (i) higher activation when displays were segmented by time or by motion, and (ii) correlated activity with larger segmentation benefits behaviorally, regardless of the cue. Additionally, the results revealed that success in temporal segmentation was correlated with reduced activation in early visual areas, including V1. The results depict partially overlapping brain networks for segmentation in search by time and motion, with both cue-independent and cue-specific mechanisms. © 2011 Massachusetts Institute of Technology.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Jim Jamieson
Date Deposited: 28 Nov 2011 13:11
Last Modified: 04 Feb 2019 11:16

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