LONG-EVANS HOODED RATS RAISED IN A COMPLEX ENVIRONMENT (CE), RESTRICTED ENVIRONMENT (RE), SIMPLE ENVIRONMENT (SE), OR ENVIRONMENT WITH BARRIERS (BE) WERE GIVEN 3 EXPLORATION TESTS. IN SUBSEQUENT HEBB-WILLIAMS CLOSED-FIELD TEST TRAINING AND TESTING, THE CLOSED FIELD WAS STATIONARY (STA) FOR 1/2 OF SS AND ROTATED AFTER EVERY TRIAL FOR THE OTHER 1/2. IN THE CLOSE-FIELD TEST, SE, BE, AND CE SS WERE SUPERIOR TO RE SS ONLY UNDER THE STA CONDITION. REARING CONDITIONS DID NOT AFFECT AMOUNT OF EXPLORATION. SUPERIOR HEBB-WILLIAMS TEST PERFORMANCE BY SE, BE, AND CE SS UNDER THE STA CONDITION WAS ASCRIBED TO GREATER USE OF EXTRAFIELD CUES BY THESE SS THAN BY RE SS. (PsycINFO Database Record (c) 2006 APA, all rights reserved)