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Comparing Segmentation by Time and by Motion in Visual Search: An fMRI Investigation

Dent, Kevin and Allen, Harriet and Humphreys, Glyn W (2011) 'Comparing Segmentation by Time and by Motion in Visual Search: An fMRI Investigation.' Journal of Cognitive Neuroscience, 23 (7). pp. 1710-1722. ISSN 0898-929X

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Abstract

<jats:title>Abstract</jats:title> <jats:p>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 the motion 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.</jats:p>

Item Type: Article
Uncontrolled Keywords: Gyrus Cinguli; Cerebral Cortex; Visual Cortex; Parietal Lobe; Humans; Magnetic Resonance Imaging; Photic Stimulation; Mental Processes; Cues; Space Perception; Time Perception; Motion Perception
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Psychology, Department of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 28 Nov 2011 13:11
Last Modified: 15 Jan 2022 01:02
URI: http://repository.essex.ac.uk/id/eprint/1619

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