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Pathologic pain distorts visuospatial perception

From the Department of Acute Critical Medicine (Anesthesiology), Osaka University, Graduate School of Medicine, Osaka, Japan (M. Sumitani, M. Shibata, T. Iwakura, Y.M., G.S., T. Inoue, T.M.); Center for Pain Management, Osaka University Hospital, Osaka, Japan (M. Sumitani, M. Shibata, Y.M., G.S., T. Inoue, T.M.); and Kobe Advanced ICT Research Center, National Institute of Information and Communications Technology, Kobe, Japan (S.M.).

Address correspondence and reprint requests to Dr. Satoru Miyauchi, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe-shi, Hyogo 652492 Japan; e-mail: miyauchi{at}po.nict.go.jp

Spatial perception is achieved by integrating multisensory information. Using visual subjective body midline (vSM) judgments in patients with unilateral limb pain (complex regional pain syndrome [CRPS]), we found that their vSM deviated toward the affected side; however, deafferentation of the affected limb caused a transient pain decrease and a transient shift of the vSM deviation toward the unaffected side. Our results indicate that the persistent pain state in CRPS distorts visuospatial perception.

Additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the January 9 issue to find the title link for this article.

See also page 128

Disclosure: The authors report no conflicts of interest.

Received May 15, 2006. Accepted in final form September 29, 2006.

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