Subdural cortical recordings of motor-associated potentials during internally triggered and externally cued movements

Movement associated cortical potentials have been reported during different types of movements. Internally paced and externally triggered movements are probably processed differently in the motor cortex. Four patients in whom subdural electrodes were implanted for the presurgical evaluation of epileptic foci took part in the study. We studied pre-movement and post-movement related potentials and their generators during internally and externally cued movements. Also, we recorded somatosensory evoked potentials after median nerve stimulation for a neurophysiological definition of the central sulcus. Repeated singl…