title: Error patterns in level 4 and level 5 object permanence training.
mesh_terms: D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003210:Concept Formation; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006801:Humans; D007223:Infant; D007360:Intelligence; D008297:Male; D011582:Psychological Theory; D012054:Reinforcement, Psychology; D012201:Reward; D014796:Visual Perception