Macintosh analogue of the rotary pursuit task

Pursuit tracking, a perceptual motor-skill task, has had wide application in many areas of psychology. The task is usually administered with a mechanical device in which subjects try to maintain a contact between a stylus and a disk on a rotating platter. A pursuit-tracking task that can be administered on a Macintosh computer is described. Subjects try to keep a crosshair cursor on top of a moving circular target. The cursor can be controlled by commonly used Macintosh ADB devices such as a joystick. The computer version has several important advantages: it offers more task flexibility and more accurate dependent measures of performance, and it is inexpensive.