 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 infants during substage 4 of their sensorimotor stage .
The A-not-B error is an incomplete or absent schema of object permanence, normally observed during the sensorimotor stage of Jean Piaget 's Theory of Cognitive Development .
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(also known as "stage 4 error" or "perseverative error") is a phenomenon uncovered by the work
is an incomplete or absent schema of object permanence, normally observed during the sensorimotor stage
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in his theory of cognitive development of children. The A-not-B error is a particular error made by infants during substage 4 of their sensorimotor stage
's Theory of Cognitive Development