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| Research article summary (published 30 Mar 2003): |
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Neuronal correlates of perception in early visual cortex.
Full Abstract
We used functional magnetic resonance imaging (fMRI) to measure activity in human early visual cortex (areas V1, V2 and V3) during a challenging contrast-detection task. Subjects attempted to detect the presence of slight contrast increments added to two kinds of background patterns. Behavioral responses were recorded so that the corresponding cortical activity could be grouped into the usual signal detection categories:
hits, false alarms, misses and correct rejects. For both kinds of background patterns, the measured cortical activity was retinotopically specific. Hits and false alarms were associated with significantly more cortical activity than were correct rejects and misses. That false alarms evoked more activity than misses indicates that activity in early visual cortex corresponded to the subjects' percepts, rather than to the physically presented stimulus.
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Author information
Author/s: Ress, David (D); Heeger, David J (DJ);
Affiliation: Department of Psychology, Stanford University, 450 Serra Mall, Bldg. 420/400, Stanford, California 94309, USA. ress(-atsign-)stanford.edu
Grants: R01 EY011794-09 (Agency:United States NEI) ; R01-EY11794 (Agency:United States NEI)
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Nature neuroscience (Nat Neurosci), published in United States. (Language: eng)
Reference: 2003-Apr; vol 6 (issue 4) : pp 414-20
Dates: Created 2003/03/26; Completed 2003/06/10; Revised 2008/04/04;
PMID: 12627164, 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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