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The A-not-B error (Piaget, 1954) , which occurs when infants search perseveratively on reversal trials in a delayed-response task, is one of the most widely studied phenomena in developmental psychology. Nonetheless, the effect of A-trial experience on the probability and magnitude of this error remains unclear. In this study, 9-month-old infants were tested at location A until they searched correctly on 1, 6, or 11 A trials. Results revealed an effect of A trials on the proportion of infantsdoi:10.1207/s15327078in0304_06 fatcat:2now6l5vl5gedkv5xb27r3hxym