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Reinforcement Effects On The I.Q. Scores Of Institutionalized Children And Adults With Developmental Disabilities, Jody Robin Lewis
Reinforcement Effects On The I.Q. Scores Of Institutionalized Children And Adults With Developmental Disabilities, Jody Robin Lewis
Masters Theses
Eighteen institutionalized school-age and adult subjects with severe/profound developmental disabilities were evaluated for the effects of self-selected reinforcement for correct responding on their I.Q. scores when tested with the Stanford-Binet Intelligence Scale (Terman & Merrill, 1960) or the Leiter International Performance Scale (Arthur, 1952). Subjects were tested under both standard and reinforcement conditions. The results indicated that overall, subjects when tested under reinforcement conditions showed a significant increase in mean I.Q. scores when compared with the same subjects tested one month previously under standard conditions. Several features of the data reveal intriguing results with regard to subjects and related preexisting …
Cocaine And Timing: Drug Effects Under A Mixed Fixed-Interval Extinction Schedule, Vincent O. Hodge
Cocaine And Timing: Drug Effects Under A Mixed Fixed-Interval Extinction Schedule, Vincent O. Hodge
Masters Theses
The effects of cocaine hydrochloride (3.2-56.2 mg/kg) were determined in rats performing under a mixed fixed-interval 60-seconds extinction 120-seconds schedule of food delivery. Responses were recorded in successive 5-second bins. With the exception of the highest dose (56.2 mg/kg), cocaine did not significantly affect rate of responding under the fixed-interval component or extinction component, or the time of peak responding under the extinction component. The highest dose significantly reduced response rates and shifted the time of peak responding leftward to quicker and earlier moments. Results are discussed in terms of possible rate- and time-dependent effects of stimulant drugs.