Semantic context and visual feature effects in object naming: an fMRI study using arterial spin labeling

Hocking, J., McMahon, K. L. and de Zubicaray, G. I. (2009) Semantic context and visual feature effects in object naming: an fMRI study using arterial spin labeling. Journal of Cognitive Neuroscience, 21 8: 1571-1583. doi:10.1162/jocn.2009.21114

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Author Hocking, J.
McMahon, K. L.
de Zubicaray, G. I.
Title Semantic context and visual feature effects in object naming: an fMRI study using arterial spin labeling
Journal name Journal of Cognitive Neuroscience   Check publisher's open access policy
ISSN 1530-8898
0898-929X
Publication date 2009-08-01
Year available 2009
Sub-type Article (original research)
DOI 10.1162/jocn.2009.21114
Open Access Status File (Publisher version)
Volume 21
Issue 8
Start page 1571
End page 1583
Total pages 13
Editor Mark D'Esposito
Place of publication Cambridge, MA, United States
Publisher M I T Press
Language eng
Abstract Previous behavioral studies reported a robust effect of increased naming latencies when objects to be named were blocked within semantic category, compared to items blocked between category. This semantic context effect has been attributed to various mechanisms including inhibition or excitation of lexico-semantic representations and incremental learning of associations between semantic features and names, and is hypothesized to increase demands on verbal self-monitoring during speech production. Objects within categories also share many visual structural features, introducing a potential confound when interpreting the level at which the context effect might occur. Consistent with previous findings, we report a significant increase in response latencies when naming categorically related objects within blocks, an effect associated with increased perfusion fMRI signal bilaterally in the hippocampus and in the left middle to posterior superior temporal cortex. No perfusion changes were observed in the middle section of the left middle temporal cortex, a region associated with retrieval of lexical–semantic information in previous object naming studies. Although a manipulation of visual feature similarity did not influence naming latencies, we observed perfusion increases in the perirhinal cortex for naming objects with similar visual features that interacted with the semantic context in which objects were named. These results provide support for the view that the semantic context effect in object naming occurs due to an incremental learning mechanism, and involves increased demands on verbal self-monitoring.
Keyword Event-related Fmri
Brain Activation
Behaviour Change
Cognitive neuroscience
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 03 Sep 2009, 17:57:09 EST by Mr Andrew Martlew on behalf of Centre For Magnetic Resonance