Abstract
Locomotor activities of tamarins and tree shrews were monitored using a passive infrared detector (PID) and a small hand-held computer as a recording unit. It is a low-cost system, easy to install and to handle without any disturbing effects on the animals investigated. Recording activity is not limited to specific sites in the cage. A temporal resolution of about two seconds for activity detection will meet most experimental requirements. The method was validated by a comparison of PID-recorded signals with simultaneous behavioral observations using a video-recorder. PID is highly specific, detecting only those movements which involve a change in location. The recording system can be adapted to various experimental conditions or other mammalian species.
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