Effects of extinction and negative reinforcement on latency of responses (including aggression and self-injurious behavior) following activity requests to an adolescent girl with mental retardation and autism were evaluated. Results showed that latencies occurred in a predictable order. The response class was expanded to include an appropriate…

Results of a functional analysis of self-injurious behavior (SIB) in a 7-year-old child with autism showed that her SIB was maintained by access to preferred object and escape or avoidance of task demands. Warning stimuli in combination with extinction and noncontingent reinforcement reduced SIB to acceptable levels. (Author/CR)