Date of Award


Degree Name

Master of Arts



First Advisor

Dr. Jack L. Michael

Access Setting

Masters Thesis-Open Access


Repeated-acquisition data were obtained from four developmentally disabled adults. The task was selecting the poker chip with the sticker on its underside in a sequence of sets of chips. When a sequence was mastered (four consecutive errorless runs) the subjects were given a new sequence to learn. Money was reinforcement for correct sequence completion. Total errors before mastery was the dependent variable.

In Phase 1 the subjects completed as many sequences as possible during each 15-minute session. Errors per sequence was a reasonably stable dependent variable within subjects, and between-subject differences were what would be expected on the basis of intellectual test scores. During Phase 2 the subjects were presented with only one sequence per session. Phase 3 was a return to the conditions of Phase 1. The effects of this manipulation were unclear. During Phase 4 the number of chips per set was increased for three of the subjects. Two were able to learn the larger sequence.