Practice makes perfect: the neural substrates of tactile discrimination by Mah-Jong experts include the primary visual cortex

Springer Science and Business Media LLC - Tập 7 Số 1 - 2006
Daisuke N. Saito1, Tomohisa Okada1, Manabu Honda2, Yoshiharu Yonekura3, Norihiro Sadato4
1Division of Cerebral Integration, National Institute for Physiological Sciences, Okazaki, Japan
2Department of Cortical Function Disorders, National Institute of Neuroscience, National Center for Neurology and Psychiatry, Tokyo, Japan
3Biomedical Imaging Research Center, University of Fukui, Fukui, Japan
4JST (Japan Science and Technology Corporation)/RISTEX (Research Institute of Science and Technology for Society), Kawaguchi, Japan

Tóm tắt

Abstract Background It has yet to be determined whether visual-tactile cross-modal plasticity due to visual deprivation, particularly in the primary visual cortex (V1), is solely due to visual deprivation or if it is a result of long-term tactile training. Here we conducted an fMRI study with normally-sighted participants who had undergone long-term training on the tactile shape discrimination of the two dimensional (2D) shapes on Mah-Jong tiles (Mah-Jong experts). Eight Mah-Jong experts and twelve healthy volunteers who were naïve to Mah-Jong performed a tactile shape matching task using Mah-Jong tiles with no visual input. Furthermore, seven out of eight experts performed a tactile shape matching task with unfamiliar 2D Braille characters. Results When participants performed tactile discrimination of Mah-Jong tiles, the left lateral occipital cortex (LO) and V1 were activated in the well-trained subjects. In the naïve subjects, the LO was activated but V1 was not activated. Both the LO and V1 of the well-trained subjects were activated during Braille tactile discrimination tasks. Conclusion The activation of V1 in subjects trained in tactile discrimination may represent altered cross-modal responses as a result of long-term training.

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Tập 7 Số 1

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