A system for delivering a touch sensitive screen task to a subject includes a touch sensitive display for presenting visual stimuli to a subject and for providing a response of the subject, hand position monitoring unit(s) for receiving input indicative of the position of a hand of the subject and for providing output signals representing said position and a controller/processor unit operatively coupled to the touch sensitive display unit and to the hand position monitoring unit(s) for receiving output signals from the hand position monitoring unit(s) and for processing the output signals to control the displaying of the visual stimuli on the touch sensitive display unit. A method for operating the system includes receiving from the subject signals representing a response of the subject to visual stimuli, receiving signals indicative of the position of the subject's hand and processing the signals to control the presenting of visual stimuli.