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| Research article summary (published 27 Feb 2003): |
Comparison of block and event-related fMRI designs in evaluating the word-frequency effect.
Full Abstract
Printed word frequency can modulate retrieval effort in a task requiring associative semantic judgment. Event-related fMRI, while avoiding stimulus order predictability, is in theory statistically less powerful than block designs. We compared one event-related and two block designs that evaluated the same semantic judgment task and found that similar brain regions demonstrated the word frequency effect. Although the responses were lower in amplitude, event-related fMRI was able to detect the word frequency effect to a comparable degree compared to the block designs. The detection of a frequency effect with the event-related design also suggests that stimulus-order predictability may not be as serious a concern in block designs as might be supposed.Copyright 2003 Wiley-Liss, Inc.
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Author information
Author/s: Chee, Michael W L (MW); Venkatraman, Vinod (V); Westphal, Christopher (C); Siong, Soon Chun (SC);
Affiliation: Cognitive Neuroscience Laboratory, Singapore General Hospital, Singapore. mchee(-atsign-)pacific.net.sg
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Human brain mapping (Hum Brain Mapp), published in United States. (Language: eng)
Reference: 2003-Mar; vol 18 (issue 3) : pp 186-93
Dates: Created 2003/02/24; Completed 2003/05/07; Revised 2006/11/15;
PMID: 12599276, 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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