A stimulus control procedure to increase requesting with individuals who are severely/profoundly intellectually disabled.

Various procedures have been used to establish and increase manual signed and spoken requesting with individuals who are intellectually disabled. A few studies have used the so-called blockable response conditioned establishing operation (BR-CEO) as a stimulus control procedure to increase requesting. A variation on the BR-CEO is the interrupted chain procedure, in which requesting for the activity that had been interrupted is reinforced by continuation of the activity. Rather than interrupting an ongoing activity, six individuals who are severely/profoundly intellectually disabled were studied with respect to the differential effectiveness of presenting them incomplete versus complete referents (i.e. activity and objects) as a consequence of their requesting on their rate of requesting. Data were collected within a reversal design. The results show that five out of six individuals more than doubled their rate of requesting. Incomplete presentation of referents may be a practical procedure to increase requesting.