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Ipsidirectional impairment of prism adaptation after unilateral lesion of anterior cerebellum

From Espace et Action, UMR-S 534 (Drs. Pisella, Rossetti, Michel, Rode, Boisson, Pélisson, and Tilikete), INSERM, Université Claude Bernard Lyon I, Institut Fédératif des Neurosciences de Lyon, Mouvement et Handicap, Lyon, France; Hospices Civils de Lyon (Drs. Rossetti, Rode, Boisson, and Tilikete), Université Claude Bernard Lyon I, Service de Rééducation Neurologique de l’Hôpital Henry Gabrielle, Service de Neuro-Ophtalmologie de l’Hôpital Neurologique, Lyon, France.

Address correspondence and reprint requests to Dr. Laure Pisella, INSERM U534, Espace et Action, 16 avenue Lépine, 69676 Bron Cedex, France; e-mail: pisella{at}lyon.inserm.fr

In a patient with damage of the left cerebellar cortex (SCA territory), the authors tested four combinations of exposure to optical shift (leftward prisms, right hand; rightward prisms, right hand; leftward prisms, left (ataxic) hand; rightward prisms, left (ataxic) hand). He adapted to rightward but not leftward prisms, independent of which hand was used during exposure. This suggests a role of anterior cerebellar cortex in the computation or compensation of ipsidirectional visual error.

Supported by INSERM (PROGRÈS), ACI Plasticité, and PHRC 2003.

Received December 21, 2004. Accepted in final form April 6, 2005.

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