Behavior analysts typically teach conditional discriminations in a mixed-trial format but may switch to a blocked-trial format for learners displaying limited acquisition. No known research has shown that mixed-trial methods are more effective or efficient than blocked-trial methods for teaching discriminations, so it is not clear why this format…

Visual discrimination and motor reproduction tasks involving computer-simulated arm movements were administered to 12 adults with mental retardation and a gender-matched control group. The purpose was to examine whether inadequacies in visual perception account for the poorer motor performance of this population. Results indicate both perceptual…

This study of visual discrimination training with 22 adults with mental retardation involved either computer-delivered instruction with a stimulus-fading procedure or teacher-delivered verbal and nonverbal prompts. While the teacher prompts were effective with more subjects, participants learned more discrimination problems with the computer…