Operant conditioning: A study in teaching perceptual-motor and language skills to brain damaged children

Studies on brain damage published in the last ten years have been accomplished with few exceptions, by the use of one clinical test, the Weschler Adult Intelligence Scale. David Weschler (1958), the author of these tests, summarized the effects of brain damage on intellectual processes: an inability to organize, disturbances in solving visual - motor problems, inability to shift easily from one problem to another, and memory defects. The verbal score is higher than the performance score; the lowest score is usually on the Digit Symbol subtest, followed by low scores on the Block Deigns, Picture Arrangement, and Object Assembly.