In response to a previous article proposing perceptual reinforcement of stereotyped movements in autistic and mentally retarded persons, it is argued that this theory fails to take into account biological findings and theory regarding pathological stereotyped acts. An alternative theory derived from neurological concepts is suggested. (Author/DB)

Three experiments investigated the effects of a treatment package on the self-injurious behavior of three profoundly retarded persons (ages 8-27 years) who appeared to enjoy the physical restraints used to prevent their self-injury. (Author)

Five experiments with severely retarded noncompliant males made use of behavioral momentum to increase compliance. A series of commands with which the subject was very likely to comply were issued immediately prior to issuing a low-probability command. Results indicated increased compliance and decreased compliance latency and task duration.…

The behavior of four adolescents with severe or profound mental retardation was evaluated in the presence of four sets of materials during periods of unstructured leisure activity. Results indicate that the participants allocated their time principally to stereotypic behavior with materials when the number of sets of materials available was…

The representativeness of behavioral observation samples with durations of less than the whole time of interest was investigated with five profoundly mentally retarded physically handicapped adults in an institutional setting. It was found that the session representativeness was a function of the relative duration of the behavioral categories and…

A functional analysis of eye poking by a four-year-old female with severe developmental disabilities and visual impairments showed that high rates occurred in all conditions. Attempts to identify the maintaining variable found that eye poking decreased only when finger-eye contact was interrupted by blocking the response. (Author/DB)

A study of the relationship between presence or absence of sleep deprivation, allergy symptoms, and the rate and function of problem behavior in three adolescents with moderate to profound mental retardation found that problem behavior was negatively reinforced by escape from instruction, and both allergy symptoms and sleep deprivation influenced…