Changes in peer verbalizations accompanying individual and group contingencies to modify on-task behavior.

Group and individual contingency arrangements were alternately applied to modify the on-task performance of 5 behavior-disordered children. Concurrent records were maintained regarding the children's task-relevant (facilitating) and non-task-relevant (inhibiting) verbalizations to peers. Both contingency arrangements were effective for controlling the children's on-task behavior while only the group contingency was associated with changes in their verbalizations. Specifically, the group contingency, as compared to the baseline and the individual contingency, was accompanied by a significant increase in facilitating verbalizations by peers. Moreover, the group contingency, in relation to the baseline but not the individual contingency, resulted in significantly fewer inhibiting verbalizations. The individual contingency did not affect either facilitating or inhibiting verbalizations of peers.