Abstract
We describe an ultrasonic motion sensing system for measuring the motor activity of individual squirrel monkeys in their home cage. The system utilizes an inexpensive Commodore 64 microcomputer for data collection and can distinguish between movements of short (i.e., < 1.0 s) and longer (i.e., ≥ 1.0s) duration, and between number of movements and time spent in motion. The diurnal pattern of spontaneous activity is illustrated along with the dose-dependent effects of d-amphetamine (0.025–1.6 mg/kg) and haloperidol (0.025–0.4 mg/kg).
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