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| Research article summary (published 29 Jun 2003): |
Repetition effects elicited by objects and their contexts: an fMRI study.
Full Abstract
Event-related fMRI responses were recorded during a recognition memory test for previously studied visual objects. Some studied objects were superimposed on the same context (landscape scenes) as at study, some were superimposed on a different studied context, and some were paired with new contexts. Unstudied objects were paired with either a studied or a new context. Relative to all other stimulus classes, test stimuli where both components were unstudied elicited enhanced responses in lateral and ventral extrastriate visual cortex. This effect, which is analogous to a previously described electrophysiological result obtained with the same experimental procedure, had the same magnitude regardless of whether a test item was composed of one or two studied components, or whether a single studied component was task relevant or task irrelevant. The findings point to the existence of repetition-sensitive neural mechanisms that operate in a non-linear manner.Copyright 2003 Wiley-Liss, Inc.
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Author information
Author/s: Tsivilis, Dimitris (D); Otten, Leun J (LJ); Rugg, Michael D (MD);
Affiliation: Institute of Cognitive Neuroscience and Department of Psychology, University College London, London, United Kingdom.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Human brain mapping (Hum Brain Mapp), published in United States. (Language: eng)
Reference: 2003-Jul; vol 19 (issue 3) : pp 145-54
Dates: Created 2003/06/17; Completed 2003/07/31; Revised 2006/11/15;
PMID: 12811731, 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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