Abstract

Differential responding under discriminative control in two concurrent responses, vocalization and leg kick, was achieved with an infant less than 3 months of age. Both vocalization and leg kick were separately reinforced, placed under schedule control, and integrated into a disjunctive discrimination schedule in which each response was reinforced in the presence of a different discriminative stimulus; reinforcement and extinction were reciprocal operations here since the S D for one response was an S Δ for the other response. The acquisition of differential responding under discriminative control clearly established that the behaviors under study were operants.

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