A perfusion fMRI investigation of thematic and categorical context effects in the spoken production of object names

de Zubicaray, Greig, Johnson, Kori, Howard, David and McMahon, Katie (2014) A perfusion fMRI investigation of thematic and categorical context effects in the spoken production of object names. Cortex, 54 1: 135-149. doi:10.1016/j.cortex.2014.01.018

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Author de Zubicaray, Greig
Johnson, Kori
Howard, David
McMahon, Katie
Title A perfusion fMRI investigation of thematic and categorical context effects in the spoken production of object names
Journal name Cortex   Check publisher's open access policy
ISSN 0010-9452
1973-8102
Publication date 2014-05
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.cortex.2014.01.018
Open Access Status File (Author Post-print)
Volume 54
Issue 1
Start page 135
End page 149
Total pages 15
Place of publication Milan, Italy
Publisher Elsevier Masson
Collection year 2015
Language eng
Formatted abstract
Highlights
• Investigated interference effects in blocked cyclic naming with perfusion fMRI.
• Naming objects in categorically-related contexts induced significant interference.
• Interference elicited perfusion decreases in left temporal cortex and hippocampus.
• Thematically-related contexts did not induce an interference effect.

The context in which objects are presented influences the speed at which they are named. We employed the blocked cyclic naming paradigm and perfusion fMRI to investigate the mechanisms responsible for interference effects reported for thematically- and categorically-related compared to unrelated contexts. Naming objects in categorically homogeneous contexts induced a significant interference effect that accumulated from the second cycle onwards. This interference effect was associated with significant perfusion signal decreases in left middle and posterior lateral temporal cortex and the hippocampus. By contrast, thematically homogeneous contexts facilitated naming latencies significantly in the first cycle and did not differ from heterogeneous contexts thereafter, nor were they associated with any perfusion signal changes compared to heterogeneous contexts. These results are interpreted as being consistent with an account in which the interference effect both originates and has its locus at the lexical level, with an incremental learning mechanism adapting the activation levels of target lexical representations following access. We discuss the implications of these findings for accounts that assume thematic relations can be active lexical competitors or assume mandatory involvement of top-down control mechanisms in interference effects during naming.
Keyword Semantic interference
Object naming
Lexical selection
Spoken word production
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 11 February 2014

 
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Created: Wed, 19 Feb 2014, 13:39:44 EST by Sandrine Ducrot on behalf of School of Psychology