Abstract
ObjectiveTo investigate the postural effect of 2 types of sensory stimulation in patients with a left hemispheric lesion (LHL) or right hemispheric lesion (RHL) compared with controls. Methods35 patients (18 LHL, 17 RHL) and 27 controls (mean age 54.1years), with a mean delay post-stroke of 3.0months were enrolled. Subjects stood on a force platform and were stimulated on the left and right side by optokinetic (Okn) and galvanic vestibular (Gv) stimulation. Lateral displacement following stimulation toward the right and left directions was calculated as the mean position of the centre of pressure (CP) during the stimulation period minus the mean position at rest. ResultsPostural asymmetry was reduced in LHL and RHL patients. CP displacement was higher in cases of left-sided stimulation in the RHL group compared with control subjects and LHL patients (respectively 2.8 and 2.4 times higher, group effect, p<0.001, group×direction of stimulation interaction, p=0.007). The magnitude of displacement under Okn significantly correlated with Gv in all cases (ρ=0.635, p<0.001). ConclusionsBoth GV and Okn stimulations can modulate hemiparetic’s CP and their postural effects are correlated. SignificanceResults support a high level cortical postural effect of sensory stimulation on supramodal spatial network.
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