Date of Award


Degree Name

Master of Arts



First Advisor

Dr. R. Wayne Fuqua

Second Advisor

Dr. Alan Poling

Third Advisor

Dr. Galen Alessi

Access Setting

Masters Thesis-Open Access


Fixed interval (FI), fixed time (FT), and fixed ratio (FR) schedules of reinforcement were implemented with two retarded subjects and the effects on operant responding and interim activities were evaluated. One subject responded under FI 1 min, multiple FI 1 min, and multiple FI 1 min extinction schedules. Three interim activities were observed to occur under each schedule. The second subject responded under FI 1 min, FI 3 min, FR 20, FR 25, FR 35, multimple FR 35, FT 1 min, and multiple FR 35 extinction schedules. Two interim activities occured, primarily in the FI and FR schedules. Both subjects' responding under FI and FT schedules developed a pause and response pattern, and subject 2 showed a characteristic pause-and-run pattern in FR schedules. Only one of the interim activities of one subject conformed to the characteristics of an adjunctive behavior.