What behavioral modification involves removing sensitivity to a trigger by slowly introducing it?

Desensitization is the process that specifically involves reducing sensitivity to a trigger by gradually exposing an animal to that trigger in a controlled manner. This is done by starting with a very low intensity of the stimulus and gradually increasing it over time, allowing the animal to become accustomed to the presence of what previously elicited a fearful or anxious response. This technique is fundamental in helping to alleviate fear responses, making it essential for Fear Free practices.

In contrast, counterconditioning focuses on changing an animal's emotional response to a stimulus by pairing that stimulus with something positive, rather than simply reducing the sensitivity to it. Classical conditioning refers to associating a neutral stimulus with an unconditioned stimulus to elicit a conditioned response, while operant conditioning involves using reinforcement or punishment to influence behavior. These methodologies are important in behavioral training but are not primarily about the gradual reduction of sensitivity to a trigger through repeated exposure as desensitization is.