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Forced-choice versus free-choice procedures: caffeine self-administration in humans
A H Oliveto1, J R Hughes, S T Higgins
1Department of Psychiatry, University of Vermont, Burlington 05401.
Psychopharmacology
|January 1, 1992
Summary
This study found that caffeine self-administration results are similar whether participants are required to drink coffee (forced-choice) or not (free-choice). This suggests comparable outcomes for caffeine, but further research is needed for stronger drug self-administration.
Area of Science:
- Behavioral neuroscience
- Psychopharmacology
- Human experimental psychology
Background:
- Drug self-administration studies often infer behavior from forced-choice procedures.
- Methodological comparisons of self-administration procedures are infrequent.
- Caffeine's reinforcing effects are typically studied indirectly.
Purpose of the Study:
- To compare caffeine self-administration under forced-choice versus free-choice conditions.
- To determine if different procedural requirements impact caffeine intake.
- To assess the generalizability of findings across choice paradigms.
Main Methods:
- Ten moderate coffee drinkers participated in a randomized cross-over design.
- Subjects underwent forced-choice and free-choice conditions with caffeinated and decaffeinated coffee.
- A double-blind design with exposure and test periods was employed.
Main Results:
- The relative self-administration rate of caffeinated versus decaffeinated coffee was similar across both choice conditions.
- Significantly fewer total cups of both coffee types were consumed under the free-choice condition compared to the forced-choice condition.
- Individual differences in caffeine intake were observed.
Conclusions:
- Forced-choice and free-choice procedures yield comparable results for caffeine self-administration.
- The findings suggest procedural methodology may not significantly alter caffeine's reinforcing effects.
- Further investigation is required to ascertain if these results extend to drugs with more potent self-administration potential.