Answer: Extinction
Explanation: The term Extinction refers to the process of disappearing a response from an individual's repertoire. In the responding paradigm, extinction occurs when a conditioned stimulus stops eliciting a particular response.
For example, a person who has developed fear of the elevator, as it comes into contact with the aversion object and nothing bad happens, the "elevator" stimulus loses the function of eliciting anxiety responses. However, it is precisely this need to expose oneself to the aversion stimulus that causes people to sustain the fear.