Children's lever-pulling behavior as a function of shifts in delay of reinforcement interval: a modified replication.
D000704:Analysis of Variance; D002648:Child; D002652:Child Behavior; D005260:Female; D005639:Frustration; D006801:Humans; D008297:Male; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D013997:Time Factors