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Social stimulation of vocalizations in delayed infants: familiar and novel agent.

WIEGERINK, RONALD; HARRIS, CLEO; SIMEONSSON, RUNE; and PEARSON, MARY ELLEN. Social Stimulation of Vocalizations in Delayed Infants: Familiar and Novel Agent. CHILD DEVELOPMENT, 1974, 45, 866-872. 6 developmentally delayed infants (11-22 months) were tested to determine whether vocalizations could be differentially modified by operant procedures with familiar (mother) and novel (experimenter) reinforcing agents. Each infant participated in 2 10-min sessions daily for 2 14-day periods each, with 3 days of baseline, 5 days of reinforcement, 3 days of extinction, and 3 days of reinstatement. During the first 14 days the reinforcing agent was either a familiar or novel adult. During the second 14 days the procedure was repeated with the other adult acting as the reinforcing agent. The results indicated that the vocalizations were under control, that familiar and novel agents were equally effective as reinforcing agents, and that order of presenting agents was not significant.