Primary and secondary reinforcers in performance of a 1.0-mile walk/jog by adolescents with moderate mental retardation.

Based on visual inspection of data, reinforcement procedures, namely, use of verbal praise and verbal praise plus token exchange, were at least mildly influential in improving performance of 5 youth with moderate mental retardation compared to their initial performance without reinforcers. These findings suggest specific reinforcement may improve the time for aerobic activity by adolescents with moderate mental retardation.