title: The reaction to frustration of middle- and lower-class children.
mesh_terms: D002648:Child; D002675:Child, Preschool; D002755:Choice Behavior; D003216:Conditioning, Operant; D005260:Female; D005639:Frustration; D006801:Humans; D007389:Internal-External Control; D008297:Male; D011337:Probability Learning; D011930:Reaction Time; D012055:Reinforcement Schedule; D012201:Reward; D012923:Social Class; D013997:Time Factors