Abstract
USING ULTRASONIC MOTION DETECTORS, SENSITIVE TO BOTH SMALL RESTLESS MOVEMENTS AND LOCOMOTION, 24 MALE WISTAR STRAIN RATS CONFINED FOR 40 DAYS WERE FOUND TO BE MORE ACTIVE IMMEDIATLEY FOLLOWING RELEASE AND AGAIN DURING 2 NOVEL CAGE TESTS GIVEN 8 AND 16 DAYS AFTER RELEASE THAN CONTROLS. HOME CAGE ACTIVITY, RECORDED DURING THE INTERVENING 13 DAYS, DID NOT DIFFER. IN EXP. II, 24 HR. OF CONFINEMENT FAILED TO PRODUCE HYPERACTIVITY WHEN SS WERE TESTED IN EITHER THE HOME OR A NOVEL CAGE. THE RESULTS OF BOTH STUDIES ARE INCONSISTENT WITH THE NOTION OF AN INDEPENDENT ACTIVITY DRIVE. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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