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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 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.

Original publication

DOI

10.1162/jocn.2010.21531

Type

Journal article

Journal

J Cogn Neurosci

Publication Date

07/2011

Volume

23

Pages

1710 - 1722

Keywords

Cerebral Cortex, Cues, Gyrus Cinguli, Humans, Magnetic Resonance Imaging, Mental Processes, Motion Perception, Parietal Lobe, Photic Stimulation, Space Perception, Time Perception, Visual Cortex