Perfusion fMRI evidence for priming of shared feature-to-lexical connections during cumulative semantic interference in spoken word production

de Zubicaray. Greig, McMahon. Katie and Howard. David (2013) Perfusion fMRI evidence for priming of shared feature-to-lexical connections during cumulative semantic interference in spoken word production. Language and Cognitive Processes, 30 3: 261-272. doi:10.1080/01690965.2013.848990


Author de Zubicaray. Greig
McMahon. Katie
Howard. David
Title Perfusion fMRI evidence for priming of shared feature-to-lexical connections during cumulative semantic interference in spoken word production
Journal name Language and Cognitive Processes   Check publisher's open access policy
ISSN 0169-0965
1464-0732
Publication date 2013-10-16
Year available 2013
Sub-type Article (original research)
DOI 10.1080/01690965.2013.848990
Open Access Status Not yet assessed
Volume 30
Issue 3
Start page 261
End page 272
Total pages 12
Place of publication Abingdon, Oxon, United Kingdom
Publisher Routledge
Language eng
Abstract The speed at which target pictures are named increases monotonically as a function of prior retrieval of other exemplars of the same semantic category and is unaffected by the number of intervening items. This cumulative semantic interference effect is generally attributed to three mechanisms: shared feature activation, priming and lexical-level selection. However, at least two additional mechanisms have been proposed: (1) a 'booster' to amplify lexical-level activation and (2) retrieval-induced forgetting (RIF). In a perfusion functional Magnetic Resonance Imaging (fMRI) experiment, we tested hypotheses concerning the involvement of all five mechanisms. Our results demonstrate that the cumulative interference effect is associated with perfusion signal changes in the left perirhinal and middle temporal cortices that increase monotonically according to the ordinal position of exemplars being named. The left inferior frontal gyrus (LIFG) also showed significant perfusion signal changes across ordinal presentations; however, these responses did not conform to a monotonically increasing function. None of the cerebral regions linked with RIF in prior neuroimaging and modelling studies showed significant effects. This might be due to methodological differences between the RIF paradigm and continuous naming as the latter does not involve practicing particular information. We interpret the results as indicating priming of shared features and lexical-level selection mechanisms contribute to the cumulative interference effect, while adding noise to a booster mechanism could account for the pattern of responses observed in the LIFG.
Formatted abstract
The speed at which target pictures are named increases monotonically as a function of prior retrieval of other exemplars of the same semantic category and is unaffected by the number of intervening items. This cumulative semantic interference effect is generally attributed to three mechanisms: shared feature activation, priming and lexical-level selection. However, at least two additional mechanisms have been proposed: (1) a ‘booster’ to amplify lexical-level activation and (2) retrieval-induced forgetting (RIF). In a perfusion functional Magnetic Resonance Imaging (fMRI) experiment, we tested hypotheses concerning the involvement of all five mechanisms. Our results demonstrate that the cumulative interference effect is associated with perfusion signal changes in the left perirhinal and middle temporal cortices that increase monotonically according to the ordinal position of exemplars being named. The left inferior frontal gyrus (LIFG) also showed significant perfusion signal changes across ordinal presentations; however, these responses did not conform to a monotonically increasing function. None of the cerebral regions linked with RIF in prior neuroimaging and modelling studies showed significant effects. This might be due to methodological differences between the RIF paradigm and continuous naming as the latter does not involve practicing particular information. We interpret the results as indicating priming of shared features and lexical-level selection mechanisms contribute to the cumulative interference effect, while adding noise to a booster mechanism could account for the pattern of responses observed in the LIFG.
Keyword Semantic interference
Priming
Lexical selection
Spoken word production
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP1092619
FT0991634
Institutional Status UQ
Additional Notes Authors' prepress title: "Perfusion fMRI evidence for priming of shared features and lexical competition during cumulative semantic interference in spoken word production". Published online 16 Oct 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Centre for Advanced Imaging Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Wed, 23 Oct 2013, 21:12:55 EST by Anna Cotroneo on behalf of Centre for Advanced Imaging