A system for measuring the angular response of hemiparkinsonian monkeys to a food stimulus

A Zenith Z-100 PC system was used to control an automated feeding system for determining the angular limits at which a monkey would respond to a food stimulus. Raisins secured to the end of a rotating arm by means of vacuum pressure were delivered to the monkey alternately from clockwise and counterclockwise directions at a fixed radius. The point at which the monkey took a raisin from the end of the arm was determined by an increase in negative pressure. The arm position was measured by using a potentiometer mounted in the arm gear train. The computer system controlled the experiment as well as the on-line recording and plotting of data.