Detecting directional hypokinesia: the epidiascope technique.

A new technique to detect directional hypokinesia is proposed.. Subjects with unilateral neglect were administered cancellation tests with an epidiascope used to dissociate visual input from motor output. Two different cancellation tasks were performed in order to compare this technique with the method devised by Tegner and Levander [Brain 114, 1943-1951, 1991]. No difference in detecting hypokinetic deficits was observed; however, our method was easier to perform and more suitable for clinical testing.