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The Journal of Neuroscience, June 27, 2007, 27(26):7047-7053; doi:10.1523/JNEUROSCI.0970-07.2007

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Behavioral/Systems/Cognitive
Activity in the Posterior Parietal Cortex Mediates Visual Dominance over Kinesthesia

Nobuhiro Hagura,^1,2 Tomohiko Takei,¹ Satoshi Hirose,^1,3 Yu Aramaki,^4,6 Michikazu Matsumura,¹ Norihiro Sadato,^4,5 and Eiichi Naito^1,3,6

¹Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan, ²The Japan Society for the Promotion of Science, Tokyo 102-8472, Japan, ³Advanced Telecommunications Research Institute International Computational Neuroscience Laboratories, Kyoto 619-0288, Japan, ⁴National Institute for Physiological Sciences, Okazaki 444-8585, Japan, ⁵Japan Science and Technology Corporation/Research Institute of Science and Technology for Society, Kawaguchi 332-0012, Japan, and ⁶National Institute of Information and Communication Technology (ICT), Research Department 1, Kobe Advanced ICT Research Center, Biophysical ICT Group, Kyoto 619-0288, Japan

Correspondence should be addressed to Dr. Eiichi Naito, National Institute of Information and Communication Technology (ICT), Research Department 1, Kobe Advanced ICT Research Center, Biophysical ICT Group, ATR Computational Neuroscience Laboratories, 2-2-2 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0288, Japan. Email: enaito{at}atr.jp

When both visual and kinesthetic information of a limb are available, vision is usually the dominant source of information used to perceive the spatial location. In this study, we conducted behavioral and functional magnetic resonance imaging (fMRI) experiments to examine the brain mechanisms underlying the visual dominance over kinesthesia in perceiving the position of a hand. We used tendon vibration to induce an illusory percept of flexion movement of an immobile hand, while the participants viewed a live image of either the vibrated or nonvibrated static hand through an on-line video camera. The intensity of illusory movement was significantly attenuated (for both the left and right hands) only when the participants viewed the static image of the vibrated hand. The fMRI study showed that the posterior parietal cortex (PPC) is specifically involved in the attenuation of illusory movement and that the activity of the PPC was associated with the degree of attenuation. This indicates that PPC is involved in the multisensory processing that occurs when vision overrules simultaneously available kinesthetic information for estimating the spatial location of a limb. It is thus suggested that the human parietal cortex may play a critical role in the maintenance of a coherent body image when the brain receives potentially conflicting multisensory information from the body.

Key words: visual dominance over kinesthesia; bodily perception; posterior parietal cortex; tendon vibration; functional magnetic resonance imaging (fMRI); multisensory

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Received March 5, 2007; revised May 10, 2007; accepted May 28, 2007.

Correspondence should be addressed to Dr. Eiichi Naito, National Institute of Information and Communication Technology (ICT), Research Department 1, Kobe Advanced ICT Research Center, Biophysical ICT Group, ATR Computational Neuroscience Laboratories, 2-2-2 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0288, Japan. Email: enaito{at}atr.jp

This article has been cited by other articles:

				N. Hagura, Y. Oouchida, Y. Aramaki, T. Okada, M. Matsumura, N. Sadato, and E. Naito Visuokinesthetic Perception of Hand Movement Is Mediated by Cerebro-Cerebellar Interaction between the Left Cerebellum and Right Parietal Cortex Cereb Cortex, May 2, 2008; (2008) bhn068v1. [Abstract] [Full Text] [PDF]

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