Slow potential changes related to the velocity of target movement in a tracking task

During an 18 sec smooth pursuit tracking task slow waves in the EEG were found to be correlated with the absolute velocity of the target. They were maximum at the vertex. These are thought to be concerned with the prediction of the future position of a target in some cerebral feed-forward system in which both input information and output motor action are integral parts and illustrate sensorimotor integration in man.