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| Research article summary (published 29 Sep 2002): |
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Localizing visual discrimination processes in time and space.
Full Abstract
Previous studies of visual processing in humans using event-related potentials (ERPs) have demonstrated that task-related modulations of an early component called the "N1" wave (140-200 ms) reflect the operation of a voluntary discrimination process. Specifically, this component is larger in tasks requiring target discrimination than in tasks requiring simple detection. The present study was designed to localize this discriminative process in both time and space by means of combined magnetoencephalographic (MEG) and ERP recordings. Discriminative processing led to differential ERP and MEG activity beginning within 150 ms of stimulus onset. Source localization of the combined ERP/MEG data was performed using anatomical constraints from structural magnetic resonance images. These analyses revealed highly reliable and focused activity in regions of inferior occipital-temporal cortex. These findings indicate that the earliest measurable correlates of discriminative operations in the visual system appear as neural activity in circumscribed regions of the ventral processing stream.
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Author information
Author/s: Hopf, Jens-Max (JM); Vogel, Edward (E); Woodman, Geoffrey (G); Heinze, Hans-Jochen (HJ); Luck, Steven J (SJ);
Affiliation: Department of Neurology II, Otto-von-Guericke University, D-39120 Magdeburg, Germany. jens-max.hopf(-atsign-)medizin.uni-magdeburg.de
Grants: MH-56877 (Agency:United States NIMH)
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.
Journal: Journal of neurophysiology (J Neurophysiol), published in United States. (Language: eng)
Reference: 2002-Oct; vol 88 (issue 4) : pp 2088-95
Dates: Created 2002/10/04; Completed 2002/11/25; Revised 2007/11/14;
PMID: 12364530, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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