Question

Ken used to drool at the smell of peanut butter cookies as they baked, and he couldn't wait to sink his teeth into that first cookie. however, ken's new roommate makes terrible peanut butter cookies, and the smell of them baking is no longer associated with a wonderful taste experience. consequently, ken finds that the smell of the cookies no longer makes him drool in anticipation. this illustrates the classical conditioning process known as:

Answer 1

The answer is extinction. In classical conditioning, this occurs when a conditioned stimulus is not anymore matching with an unconditioned stimulus. While in operant conditioning, this can happen if the trained behavior is not anymore strengthened or if the kind of support used is no longer satisfying.