Results of the study with 24 mildly or moderately retarded subjects (ages 11-55 years) indicates that a separability hypothesis of perceptual development can be extended to retarded populations. Representation as wholistic objects dominated among moderately retarded subjects, and with increasing intelligence, representation of objects as component…

Normal and retarded adolescents recalled consonants after 0, 9, and 27 seconds of tonal detection and performed the detection task without recall. Subjects were classified as rehearsers or nonrehearsers, depending upon variations in tonal detection accuracy or response times across conditions. Normal and retarded nonrehearsers showed equal…

The effects of social reinforcement on two motor tasks by 40 retarded adolescents with high (8.09 yr.) and low (5.45 yr.) mental ages was investigated. Social reinforcement influenced persistence but not speed of performance. The effectiveness of praise on retarded subjects' performances varies with the type of motor task used. (Author/RD)

Performance differences between 10 nonretarded children and 10 moderately/severely retarded adolescents on a manual control task were examined. Results suggested that the ability to discriminate internal cues is related to IQ differences. (Author)

During the 1973-74 school year, 230 trainable mentally retarded (TMR) children (ages 7 to 14 years) were exposed to one of two language training conditions: Distar or Peabody. A population of 116 continuees from the first year of the project and 114 new entries were assigned in as random a fashion as possible to either Distar or Peabody. Ss were…

Effects of the different components of the Distar language program were tested on 48 trainable mentally retarded (TMR) children. Three designs were used comparing IQ, sex, continuation status, selected standardized test results, and replicates. Results indicated that the degree of previous formal language training (continuation status) did not…

Scores on the Wechsler Adult Intelligence Scale (WAIS) were compared with reevaluation scores obtained four years later on the WAIS-Revised for a group of 108 mildly and moderately retarded adults. The moderately retarded subgroups (N=22) demonstrated significantly higher WAIS-R intelligence quotients. Implications for use of the WAIS-R are…

The development of social maturity, language, and arithmetic abilities was studied over a 3-year period in 103 mentally retarded children from high IQ (51-75) and low IQ (26-50) groups in special schools and special classes. Among findings were that the high IQ groups of both special classes and special schools showed much improvement over the…

To differentiate between educationally subnormal students who do and who do not respond well to special school education, 161 children attending special classes in South Wales were studies. The first (the E-) group consisted of 47 children (mean IQ 55) found unsuitable for special school education. The second (the S-) group included 57 children…