Abstract
The main objective of this research was to demonstrate food aversion learning in rats with unrestricted access to food and water, using wheel running as the unconditioned stimulus. Experiment 1 showed that the target-running paired training group consumed a statistically smaller amount of the target food (tteok rice cakes) compared to the target/running unpaired control group, but the decrease in consumption over days in the paired group was not fully supported by a statistical test. Experiment 2a improved the methodology by familiarizing rats with tteok before training, which resulted in both a statistically significant group effect and a statistically significant daily decrease in tteok consumption. Experiment 2b demonstrated that tteok aversion could be reacquired after an extinction phase. These experiments indicate that running-based tteok aversion in non-deprived rats is a valid example of Pavlovian conditioning and suggest that wheel running can cause similar effects in unrestricted rats as observed in food- or water-restricted rats. Additionally, daily measurements of kaolin clay ingestion suggested that wheel running induced nausea in the rats of these experiments.
Published Version
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