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A stuttering therapy program in which adult stutterers were hospitalized and treated in small groups (n = 4) under token economy conditions is described. The Token System reinforced reductions and penalized increases in stuttering during conversation. The therapy program was divided into three stages. Initially, subjects were treated by the token system, which was then integrated with a delayed auditory feedback schedule designed to instate and shape a prolonged speech pattern into normal fluent speech. Finally, subjects passed through a speech situation hierarchy while under token control conditions. Experiments conducted in the first two stages of treatment are described. The first-stage experiments examined the design of the token system; the second-stage experiment assessed the effect of a contingent punishment schedule integrated with the delayed auditory feedback procedure in order to shape rate of speaking as well as fluency.
Ingham et al. (Fri,) studied this question.