Discrimination between two similar flavors in a conditioned taste aversion situation is generally difficult to establish due to generalization of aversion from conditioned stimuli to stimuli not paired with illness. The findings of experiment 1 demonstrate that this general difficulty may be overcome by preexposing subjects to a similar but non-target flavor prior to conditioning (the CS−Effect). Experiment 2 provided evidence that even limited experience with the CS−(one preexposure prior to conditioning) is sufficient to facilitate stimulus discrimination. Investigations of delay interval effects indicated that the CS−Effect is maintained when 14 days are inserted between conditioning and test (experiment 3) and when 10 days are inserted between preexposure and conditioning (experiment 4). An alternate interpretation of these results in terms of relative novelty of stimuli is discussed.
Learning and Motivation
Burch-Vernon, Angela S.; Riccio, David C. (1997). The Effects of CS−Preexposure in Conditioned Taste Aversion: Enhanced Flavor Discrimination. Learning and Motivation 28(2) 170-187. doi: 10.1006/lmot.1996.0967. Retrieved from https://oaks.kent.edu/psycpubs/47