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| Research article summary (published 29 Apr 2002): |
Multiple levels of visual object constancy revealed by event-related fMRI of repetition priming.
Full Abstract
We conducted two event-related functional magnetic resonance imaging (fMRI) experiments to investigate the neural substrates of visual object recognition in humans. We used a repetition-priming method with visual stimuli recurring at unpredictable intervals, either with the same appearance or with changes in size, viewpoint or exemplar. Lateral occipital and posterior inferior temporal cortex showed lower activity for repetitions of both real and non-sense objects; fusiform and left inferior frontal regions showed decreases for repetitions of only real objects. Repetition of different exemplars with the same name affected only the left inferior frontal cortex. Crucially, priming-induced decreases in activity of the right fusiform cortex depended on whether the three-dimensional objects were repeated with the same viewpoint, regardless of whether retinal image size changed; left fusiform decreases were independent of both viewpoint and size. These data show that dissociable subsystems in ventral visual cortex maintain distinct view-dependent and view-invariant object representations.
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Author information
Author/s: Vuilleumier, P (P); Henson, R N (RN); Driver, J (J); Dolan, R J (RJ);
Affiliation: Institute of Cognitive Neuroscience, University College London, Alexandra House, 17 Queen Square, London WC1N 3AR, UK. p.vuilleumier(-atsign-)ucl.ac.uk
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't
Journal: Nature neuroscience (Nat Neurosci), published in United States. (Language: eng)
Reference: 2002-May; vol 5 (issue 5) : pp 491-9
Dates: Created 2002/04/26; Completed 2002/05/13; Revised 2006/11/15;
PMID: 11967545, 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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