An Apple microcomputer-based laboratory system for the study of visual-motor behavior

An apparatus for studying motor control and visual-motor coordination is described. The system consists of an Apple II+ with two expansions boards installed. One board provides advanced graphics capabilities; the other interfaces the Apple with a digitizing tablet and also provides a real-time clock. Target stimulus and visual feedback concerning self-produced movement (i.e., a cursor) are displayed on a standard video monitor, and movement data are sampled by the digitizing tablet. Software consists of about 3K bytes of assembled 6502 code and a 2K byte Applesoft BASIC program. The system is inexpensive, versatile, and particularly well suited for developmental research. It has been used with human subjects as young as 3 years of age.