The associative mechanisms underlying extinction and latent inhibition

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Formal models that explain how animals learn associations between stimuli have enjoyed considerable success, and have even been identified with neurophysiological mechanisms. Theoretical analysis of the opposite, though equally important, form of learning - that two stimuli are not associated - lags far behind, due to fundamental methodological confounds that plague research on this topic. This project investigates two instances of this learning: extinction and latent inhibition. Using a new procedure that avoids earlier confounds, we will describe and compare the processes underlying extinction and latent inhibition. This research will represent a major breakthrough in our understanding about fundamental processes in learning.