Abstract
48 NONDEPRIVED RATS WERE GIVEN PRETEST EXPOSURE TO BLACK-WHITE PATTERNS IN A T MAZE FOLLOWED BY TEST TRIALS DURING WHICH THE PATTERN IN 1 ARM WAS CHANGED TO A MORE OR A LESS COMPLEX PATTERN. SYSTEMATIC CHOICE BEHAVIOR WAS OBSERVED OVER A SERIES OF 30 DAILY TRIALS AS A FUNCTION OF TEMPORAL AND SPATIAL CHANGES IN STIMULATION. SHIFTS IN MODAL RESPONSE WERE FOUND TO BE UNIDIRECTIONAL, FROM THE LESS TO THE MORE COMPLEX STIMULUS. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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