Wiktionary
n. (context psychology English) A form of conditioning in which a negative response to a stimulus is replaced by a positive one
Wikipedia
Counterconditioning (also called stimulus substitution) is a form of respondent conditioning that involves the conditioning of an unwanted behavior or response to a stimulus into a wanted behavior or response by the association of positive actions with the stimulus. For example, when training a dog, a person would create a positive response by petting or calming the dog, when the dog reacts anxiously or nervously to a stimulus. Therefore this will associate the positive response with the stimulus.
Usage examples of "counterconditioning".
It was too easy to provide the necessary chemical or mental counterconditioning in those for whom this sort of thing was a hazard of their trade.