Thirty college students and 30 moderately retarded persons averaging approximately equal age received eight alternating phases of acquisition and extinction trials with an electric pulse as the unconditioned stimulus for classical eyelid conditioning. (Author)

Designed for both parents and teachers, the handbook presents methods for educating the moderately and severely retarded child. Those methods include measuring progress, rewarding and punishing, ways of using rewards and punishers, ways of giving positive reinforcers and punishers, withholding reinforcers (extinction), letting the child reward…

TO STUDY THE EFFECTS OF OVERTRAINING ON REVERSAL AND NONREVERSAL SHIFTS OF CUES, 96 NORMAL (MEAN AGE = 117 MONTHS, MEAN IQ = 109.8) AND 96 RETARDED CHILDREN (MEAN AGE = 119 MONTHS, MEAN IQ = 70.1) WERE TESTED ON A SIMULTANEOUS 2-CHOICE DISCRIMINATION TASK. SUBJECTS WERE TRAINED ON TWO LEVELS (CRITERION AND OVERTRAINING). FOLLOWING TRAINING ON THE…

The genetics of mental retardation are discussed in terms of geographical isolates, prospects for prevention of trisomic conditions, population genetics, and cytogenetics of Down's syndrome; problems of neurogenesis described are anabolic pathways of galactose and glucose metabolism, abnormal cell migrations in developing brains, and genetic…

WORKING FROM A POPULATION OF SEVERELY AND PROFOUNDLY RETARDED RESIDENTIAL SCHOOL PATIENTS, AN ATTEMPT WAS MADE TO DEVISE AN EXPERIMENTAL PROGRAM FOR TRAINING SUBJECTS ON SELECTED WORKSHOP TASKS. TASK ANALYSIS WAS EMPLOYED TO DESCRIBE THE RESPECTIVE VOCATIONAL ENVIRONMENTS AND TO SPECIFY BEHAVIORAL REQUIREMENTS. TRAINING PROGRAMS BASED UPON THE…