Abstract
Wistar rats were given 16 open-field tests under (a) free exploration (Ss could withdraw from the field into a small dark box), (b) forced exploration, or (c) alternating free and forced exploration. Amount of locomotion and the tendency to leave the peripheral wall were initially suppressed under free exploration but recovered over tests. The tendency to rear in the field remained suppressed under free exploration over all tests. It was suggested that fear functions to inhibit locomotion under forced exploration and functions to motivate and reward escape into the small box under free exploration. As fear habituates, open-field locomotion increases.
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