Abstract
A photoelectric activity monitor which is easily moveable between cages is described, including a circuit diagram and set-up procedure. In a preliminary study, the number of squares traversed by mice on the cage floor was counted both instrumentally and visually; the instrument count ranged from 105 to 111 per 100 observer counts. In a correlation study, a simulated mouse was moved from square to square both laterally and diagonally while being counted by the instrument and a human observer. They agreed 994 and 977 times respectively in 1000 trials. The instrument should prove particularly useful in studying hyperactive mice, whose activity level is too high for the human observer to count accurately. Behavior monitor patterns may also be studied by feeding the channel outputs to a minicomputer.
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