In aversive conditioning experiments to treat alcohol addiction, every time a person drinks an alcoholic beverage, he or she also consumes a mixture that induces nausea. in classical conditioning terminology, the nausea-inducing agent is the

unconditioned stimulus

Explanation:

According to my research on the classical conditioning terminology, I can say that based on the information provided within the question the nausea-inducing agent is the unconditioned stimulus. This is a kind of stimulus that automatically triggers a specific reaction every time. Which in this situation it is a stimulus that would induce nausea and most likely vomiting as an immediate reaction of drinking alcohol.

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