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| Probability and Affort Discounting: It's Not Just Temporal Costs That Cause Reinforcer Devaluation |
| Monday, May 31, 2004 |
| 9:00 AM–10:20 AM |
| Commonwealth |
| Area: EAB/TPC; Domain: Applied Research |
| Chair: Suzanne H. Mitchell (Oregon Health & Science University) |
| Abstract: . |
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| Discounting of Probabilistic Food Rewards in Pigeons and Rats |
| LEONARD GREEN (Washington University), Joel Myerson (Washington University) |
| Abstract: Dr.s Leonard Green and Joel Myerson will present data gathered from both rats and pigeons that demonstrate that the discount functions generated in a probability discounting paradigm differ systematically from those generated in a delay discounting paradigm. |
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| Choice and Events During the Delay Interval: Possible Species Differences |
| JAMES E. MAZUR (Southern Connecticut State University) |
| Abstract: Dr. James Mazur will describe data examining the impact of conditioned reinforcers on probability discounting in rats, and will compare those data to those that he collected using pigeons and those that he collected in a delay discounting paradigm. His data indicate that, in contrast to pigeons, rats tend to take into account all the time between a response and food when choosing between certain and probabilistic reinforcers, whereas pigeons disregard inter-trial-intervals as well as any periods when distinctive conditioned reinforcers are not present. |
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| Comparison of Delay and Effort Discounting |
| JERRY B. RICHARDS (University of Buffalo), Andrew M. Farrar (University of Buffalo) |
| Abstract: Dr. Jerry Richards will describe data from a within-subject study in which the time spent to fulfill a fixed-ratio requirement in an effort discounting study was used to construct the delays used in a delay discounting procedure. His data indicate that discounting in an effort paradigm cannot be accounted for solely by the time spent completing the effort requirement. |
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| Reinforcer Magnitude and Effort Discounting Measured Using an Adjusting Amount Procedure |
| SUZANNE H. MITCHELL (Oregon Health & Science University) |
| Abstract: Dr Suzanne Mitchell will discuss a series of studies examining the impact of varying the magnitude and concentration of sucrose solution reinforcers on the extent to which rats discount the value of reinforcers requiring large amounts of effort to obtain. These data will be compared with the impact of similar manipulations on delay discounting and allow to her demonstrate areas of similarity and dissimilarity between effort and delay discounting. |
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