title: Cooperative and competitive behavior of retarded and nonretarded children at two ages.
mesh_terms: D000367:Age Factors; D002648:Child; D002652:Child Behavior; D002657:Child Development; D003071:Cognition; D003163:Competitive Behavior; D003299:Cooperative Behavior; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007398:Interpersonal Relations; D008297:Male; D011582:Psychological Theory; D012201:Reward; D012737:Sex Factors; D012951:Socialization