A-not-B Error
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A-not-B Error

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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! A-not-B error (also known as "stage 4 error" or "perseverative error") is a phenomenon uncovered by the work of Jean Piaget in his theory of cognitive development of children. The A-not-B error is a particular error made by young children during substage 4 of their sensorimotor stage. A typical task goes like this: An experimenter hides an attractive toy under box "A" within the baby's reach. The baby searches for the toy, looks under box "A", and finds the toy. This activity is usually repeated several tim...