Auditory context effects in picture naming investigated with event-related fMRI

de Zubicaray, GI and McMahon, KL (2009) Auditory context effects in picture naming investigated with event-related fMRI. Cognitive, Affective, & Behavioral Neuroscience, 9 3: 260-269. doi:10.3758/CABN.9.3.260


Author de Zubicaray, GI
McMahon, KL
Title Auditory context effects in picture naming investigated with event-related fMRI
Journal name Cognitive, Affective, & Behavioral Neuroscience   Check publisher's open access policy
ISSN 1530-7026
1531-135X
Publication date 2009-09-01
Year available 2009
Sub-type Article (original research)
DOI 10.3758/CABN.9.3.260
Open Access Status Not yet assessed
Volume 9
Issue 3
Start page 260
End page 269
Total pages 1530-7026
Editor Deanna M Barch
Place of publication United States of America
Publisher Psychonomic Society
Language eng
Subject C1
970117 Expanding Knowledge in Psychology and Cognitive Sciences
920199 Clinical Health (Organs, Diseases and Abnormal Conditions) not elsewhere classified
170205 Neurocognitive Patterns and Neural Networks
110999 Neurosciences not elsewhere classified
Abstract Naming an object entails a number of processing stages, including retrieval of a target lexical concept and encoding of its phonological word form. We investigated these stages using the picture—word interference task in an fMRI experiment. Participants named target pictures in the presence of auditorily presented semantically related, phonologically related, or unrelated distractor words or in isolation. We observed BOLD signal changes in left-hemisphere regions associated with lexical-conceptual and phonological processing, including the mid-to-posterior lateral temporal cortex. However, these BOLD responses manifested as signal reductions for all distractor conditions relative to naming alone. Compared with unrelated words, phonologically related distractors showed further signal reductions, whereas only the pars orbitalis of the left inferior frontal cortex showed a selective reduction in response in the semantic condition. We interpret these findings as indicating that the word forms of lexical competitors are phonologically encoded and that competition during lexical selection is reduced by phonologically related distractors. Since the extended nature of auditory presentation requires a large portion of a word to be presented before its meaning is accessed, we attribute the BOLD signal reductions observed for semantically related and unrelated words to lateral inhibition mechanisms engaged after target name selection has occurred, as has been proposed in some production models.
Keyword SPREADING-ACTIVATION THEORY
LANGUAGE PRODUCTION
WORD INTERFERENCE
SEMANTIC INTERFERENCE
SPEECH PRODUCTION
LEXICAL ACCESS
PHONOLOGICAL ACTIVATION
FUNCTIONAL MRI
STROOP TASK
FACILITATION
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Centre for Advanced Imaging Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 04 Sep 2009, 20:21:46 EST