In a study involving eight mildly mentally retarded and ten CA-matched nonretarded Ss, retarded Ss demonstrated slower overall choice mean reaction times than nonretarded Ss. Results also suggested that the processing difference lies in the memory scanning as opposed to the encoding decision/response of the linear model. (Author/CL)

Reexamination of three studies was undertaken to investigate factors involved in reaction time of mildly retarded Ss in high speed scanning. It was suggested that specification of processing stages where efficiency varies across populations may not be possible based on results from high speed scanning tasks. (CL)

The performance of 10 mildly mentally retarded adults on recognition memory tasks in a fixed-set and varied-set procedure was compared with that of nonretarded control subjects. Results suggest that retarded adults use different processing strategies in the two procedures and that rate of processing increases with increasing mental age. (Author/CL)

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)

Nine children with Down's syndrome were compared to two groups of nonretarded children, one similar in CA, the other a chronologically younger group of similar MA. The event-related brain potential and reaction time results indicated that Downs syndrome Ss processed some types of auditory information more slowly than the other groups. (Author/CL)

In choice reaction time (RT) tasks, the response of the appropriate finger by mentally retarded Ss is often accompanied by associated movements of responding and nonresponding fingers. To determine the effects of such associated movements, RTs were compared in two conditions with 10 mentally retarded adults. (Author)

The decision time (reaction time [RT]) and movement time of retarded persons as a function of the amplitude and precision of a discrete movement in both simple and choice RT paradigms was examined in two studies involving 24 mentally retarded adults. (Author)

The contributions of specific motor-coordination disabilities and general slowness of motor function to the choice reaction times (RTs) of 22 mildly retarded adults were examined in two experiments. (Author)

When two nonoperative lights were added to each of the ends of a stimulus display in a four choice reaction time (RT) task, the RTs of mentally retarded and nonretarded young adults Ss were slowed to about the same extent. (Author)

Two groups of eight young adults (mean IQ=68) were compared under conditions in which Ss were instructed either to respond as quickly and accurately as possible or to respond accurately and were praised each time that a response was slower than their mean reaction time (RT) during the initial session. (Author)

Investigated with 10 educable retarded and 10 non-retarded junior high school and high school students were overt indices of attending behavior during a simple reaction-time task. (Author/DB)

The degree to which response complexity affects the ability of moderately mentally retarded adults to perform on a coincident timing task was examined in two experiments. Analyses of both constant and variable error scores suggested that an optimal exposure distance for the task existed. (Author)

Apparently contradictory findings regarding the locus of information processing differences between retarded and nonretarded persons were discussed. (Author)