Three 24 member groups of retarded adolescents, chronological age-matched adolescents, and mental age-matched children were assessed in their ability to match the repetition rate of 10-second stimulus sequences presented under four modality switching conditions (unimodal, trimodal double, trimodal single periodic, and trimodal single aperiodic),…

The authors suggest that one approach to the clarification of the nature and extent of cognitive process impairments in the mentally retarded and, specifically, the involvement of structural and control process parameters is via an examination of those processes underlying the speed-accuracy operating characteristics of retarded Ss. (Author/SW)

Ten severely retarded adults were presented with a matching task in which each of the alternatives to the stimulus that was identical to the target stimulus differed from it on one dimension only. (Author)

Galvanic skin responses of 160 mentally retarded and 160 nonretarded adults from a prior study were reanalyzed in terms of separate frequency and amplitude measures. (Author)

Investigated with 20 nonorganic retarded, 20 nonretarded matched mental age, and 20 nonretarded matched chronological age Ss were two postulates (H. Spitz): that it takes longer to induce temporary and permanent changes in stimulated cortical cells of retarded Ss; and that post change cell return to previous state takes longer. (Author/MC)

Averaged auditory evoked responses were obtained from 15 retarded and motor-handicapped subjects and from 15 nonretarded subjects in order to investigate comparative responsiveness and response features. (Author)