The wanting-and-liking theory of addiction explains that the wanting and liking are produced by two different brain systems. Wanting is similar to “craving,” whereas “liking” refers to the pleasure produced by the drug.
With chronic use of drugs, the tolerance develops and the expression of liking decreases. In contrast, the other system associated with wanting become more sensitized and craving increases.
The progressive enhancement in behavioural actions followed by repeated drug administration is known as “behavioural sensitization.”
Thus, the blank can be filled with behavioural sensitization.