Bilateral hemispheric control of foot distal movements: Evidence from normal subjects

S. Aglioti, R. Dall'Agnola, M. Girelli, C. A. Marzi

Research output: Contribution to journalArticlepeer-review


Normal subjects have been tested for interhemispheric transfer (IT) of visuo-motor information using a simple reaction time (RT) paradigm and lateralized stimuli and responses (the so-called Poffenberger paradigm). In this paradigm IT time is assumed to correspond to the RT difference between crossed and uncrossed stimulus-response combinations (CUD). In Experiment 1, two types of movements were used: a unilateral flexion of the thumb and a unilateral plantar flexion of the big toe. A reliable CUD (7.4 msec) was found only with manual responses. Changing stimulus retinal eccentricity (10° vs. 70°) or attentional demands (blocked vs. random stimulus presentation) did not result in any reliable effect on the CUD. In Experiment 2 the number of RTs for each subject was considerably increased and several visual field sites (from areas close to the vertical meridian to the monocular crescent) were tested. Notwithstanding these modifications, this experiment confirmed the lack of CUD found for foot responses in Exp. 1. Taken together, these results are in keeping with a less lateralized hemispheric control of distal foot movements in comparison to hand movements.

Original languageEnglish
Pages (from-to)571-581
Number of pages11
Issue number4
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Clinical Neurology


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