Initial experiment demonstrated operant acquisition of an instrumental hand-pulling response in 4-8-month-old infants; the effect achieved with contingent, noncontingent, delayed reinforcement, and the suppression, recovery, and facilitation effects of noncontingent stimulation are discussed. (Author)

Thumbsucking of a girl aged 2 years and 9 months was recorded by the parents during three 10-minute reading baselines. In Study 1, thumbsucking was punished by contingent termination and resumption of reading. In Study ii, positive reinforcement was provided for other (non-thumbsucking) behavior. The results imply that parents can effectively…

Seven 18- to 32-month-old children received from seven to 26 experimental sessions each between October 1966 and April 1967. A session lasted from 5 to 15 minutes and concerned control over the verbal responses of the children with token-operated reinforcement devices. In order to make the results of the experimental sessions meaningful, an…