On discrimination learning trials which allowed subjects to press an information key when in doubt, retarded children made significantly more presses than control groups. Results confirmed the hypothesis that retarded children would be more outerdirected than normal children in a situation in which distractibility could not play a role. (Author/GO)

Because disabled learners may profit from procedures using gradual stimulus change, this study utilized a microcomputer to investigate the effectiveness of stimulus equalization, an error reduction procedure involving an abrupt but temporary reduction of dimensional complexity. The procedure was found to be generally effective and implications for…

Efficiency of three discrimination training procedures was compared for 21 mentally handicapped children. Results showed that two programmed techniques (graded stimulus and prompt fading) did not differ significantly, but both were significantly superior to trial-and-error learning. (Author/CL)