Four groups of moderately retarded 7- to 13-year-old children (N =4 in each group) were trained to respond to a triangle with apex up (S+) and not to a triangle with apex down (S-), with and without errors. (Author)

Twenty trainable mentally handicapped adolescents and adults received 15 training sessions involving discrimination of pictured objects representing five categories from unrelated objects. (Author/GW)

Investigated were the effects of three instructional procedures emphasizing distinctive features on the alphabet letter discrimination of 32 moderately retarded children. (Author/CL)

Forty-three severly or profoundly retarded children and adolescents who were presented with a series of three-and 10-trial form discrimination problems learned faster on the first three trials if each problem lasted for ten trials. (Author/MC)

Evaluated was the effectiveness of the TAC (Training in Attention and Concentration) Program with seven trainable retarded persons, 8- to 20-years-old. Pre- and posttest data were obtained on the Maze-trial test, a picture discrimination test, buttons test, and object sort test. The TAC Program consisted of 10 structured lessons on such tasks as…