What is a major difference between taste aversion conditioning and other forms of classical conditioning?

Classical Conditioning involves placing a neutral signal before a natural reflex occurs.  Classical conditioning basically involves forming an association between two stimuli, resulting in a learned response.

While Aversive Stimulus is something that causes displeasure, something that causes a discomfort, such as physical pain, embarrassment, emotional pain.

Aversion Conditioning involving aversive stimuli show that conditional responses may resurface after extinction.

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explanation:

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