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In page Jee Hyun Kim:

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To study anxiety, the Kim laboratory employs a classical conditioning paradigm based on the work of Ivan Pavlov known as fear conditioning. Despite originating 100 years ago, this model is widely used by modern scientists to uncover the neural mechanisms of fear and anxiety. To investigate substance abuse the Kim laboratory uses an operant conditioning paradigm based on the work of B. F. Skinner known as intravenous self-administration. Kim's research especially focuses on extinction, a form of inhibitory learning that forms the basis of exposure-based therapies for both anxiety and addiction disorders.[citation needed]