Orthographic/phonological facilitation of naming responses in the picture-word task: An event-related fMRI study using overt vocal responding

de Zubicaray, G. I., McMahon, K. L., Eastburn, M. M. and Wilson, S. J. (2002) Orthographic/phonological facilitation of naming responses in the picture-word task: An event-related fMRI study using overt vocal responding. Neuroimage, 16 4: 1084-1093. doi:10.1006/nimg.2002.1135


Author de Zubicaray, G. I.
McMahon, K. L.
Eastburn, M. M.
Wilson, S. J.
Title Orthographic/phonological facilitation of naming responses in the picture-word task: An event-related fMRI study using overt vocal responding
Journal name Neuroimage   Check publisher's open access policy
ISSN 1053-8119
Publication date 2002-01-01
Year available 2002
Sub-type Article (original research)
DOI 10.1006/nimg.2002.1135
Open Access Status Not yet assessed
Volume 16
Issue 4
Start page 1084
End page 1093
Total pages 10
Editor AW Toga
RSJ Frackowiack
J.C. Mazziotta
Place of publication USA
Publisher Elsevier Science
Language eng
Subject C1
380102 Learning, Memory, Cognition and Language
780108 Behavioural and cognitive sciences
Abstract In the picture-word interference task, naming responses are facilitated when a distractor word is orthographically and phonologically related to the depicted object as compared to an unrelated word. We used event-related functional magnetic resonance imaging (fMRI) to investigate the cerebral hemodynamic responses associated with this priming effect. Serial (or independent-stage) and interactive models of word production that explicitly account for picture-word interference effects assume that the locus of the effect is at the level of retrieving phonological codes, a role attributed recently to the left posterior superior temporal cortex (Wernicke's area). This assumption was tested by randomly presenting participants with trials from orthographically related and unrelated distractor conditions and acquiring image volumes coincident with the estimated peak hemodynamic response for each trial. Overt naming responses occurred in the absence of scanner noise, allowing reaction time data to be recorded. Analysis of this data confirmed the priming effect. Analysis of the fMRI data revealed blood oxygen level-dependent signal decreases in Wernicke's area and the right anterior temporal cortex, whereas signal increases were observed in the anterior cingulate, the right orbitomedial prefrontal, somatosensory, and inferior parietal cortices, and the occipital lobe. The results are interpreted as supporting the locus for the facilitation effect as assumed by both classes of theoretical model of word production. In addition, our results raise the possibilities that, counterintuitively, picture-word interference might be increased by the presentation of orthographically related distractors, due to competition introduced by activation of phonologically related word forms, and that this competition requires inhibitory processes to be resolved. The priming effect is therefore viewed as being sufficient to offset the increased interference. We conclude that information from functional imaging studies might be useful for constraining theoretical models of word production. (C) 2002 Elsevier Science (USA).
Keyword Neurosciences
Neuroimaging
Radiology, Nuclear Medicine & Medical Imaging
Lexical Access
Interference Task
Time-series
Anterior Cingulate
Speech Production
Activation
Pet
Identification
Similarity
Attention
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Information Technology and Electrical Engineering Publications
 
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Created: Wed, 15 Aug 2007, 04:38:35 EST