What did Piaget call the error that infants made when an object was hidden under blanket B but the infants stopped looking for the object after they looked under blanket A?

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Piaget called this the A-not-B error, which refers to the infant's tendency to search for a hidden object in the location where they previously found it (A), rather than where it was most recently hidden (B).

What Did Piaget Call the Error That Infants Made When