Cortical plasticity of audio-visual object representations

Naumer, M.J., Doehrmann, O., Müller, N.G., Muckli, L. , Kaiser, J. and Hein, G. (2009) Cortical plasticity of audio-visual object representations. Cerebral Cortex, 19(7), pp. 1641-1653. (doi: 10.1093/cercor/bhn200) (PMID:19015373) (PMCID:PMC2693620)

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Several regions in human temporal and frontal cortex are known to integrate visual and auditory object features. The processing of audio–visual (AV) associations in these regions has been found to be modulated by object familiarity. The aim of the present study was to explore training-induced plasticity in human cortical AV integration. We used functional magnetic resonance imaging to analyze the neural correlates of AV integration for unfamiliar artificial object sounds and images in naïve subjects (PRE training) and after a behavioral training session in which subjects acquired associations between some of these sounds and images (POST-training). In the PRE-training session, unfamiliar artificial object sounds and images were mainly integrated in right inferior frontal cortex (IFC). The POST-training results showed extended integration-related IFC activations bilaterally, and a recruitment of additional regions in bilateral superior temporal gyrus/sulcus and intraparietal sulcus. Furthermore, training-induced differential response patterns to mismatching compared with matching (i.e., associated) artificial AV stimuli were most pronounced in left IFC. These effects were accompanied by complementary training-induced congruency effects in right posterior middle temporal gyrus and fusiform gyrus. Together, these findings demonstrate that short-term cross-modal association learning was sufficient to induce plastic changes of both AV integration of object stimuli and mechanisms of AV congruency processing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Muckli, Professor Lars
Authors: Naumer, M.J., Doehrmann, O., Müller, N.G., Muckli, L., Kaiser, J., and Hein, G.
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
College of Science and Engineering > School of Psychology
Journal Name:Cerebral Cortex
Publisher:Oxford University Press
ISSN (Online):1460-2199
Published Online:17 November 2008
Copyright Holders:Copyright © 2008 The Authors
First Published:First published in Cerebral Cortex 19(7): 1641-1653
Publisher Policy:Reproduced under a Creative Commons License

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