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Effects of Caffeine and Nicotine on Open-Field Exploration

Male albino rats were tested for drug effects on open-field exploration, with either distilled water or drug in a repeated-measures design. Caffeine (40 mg/kg) enhanced ambulation and rearing, especially during the late minutes of Session 2, about 90 min. after injection. Nicotine (0.4 mg/kg) did not increase ambulation and rearing except during Mins. 4 to 6 of Session 2; nicotine showed only a marginal biphasic effect. These results suggest that caffeine reduced the decrement in performance across time. Perhaps caffeine reduces fatigue or increases novelty-seeking responses. A full range of doses should be studied.