What neuroadaptive changes are associated with the development of stimulant-induced anhedonia during withdrawal?

Stimulant-induced anhedonia, the inability to experience pleasure, during withdrawal is associated with several key neuroadaptive changes in the brain's reward circuitry. One major change is the downregulation and desensitization of dopamine receptors, particularly the D2 receptors, in the nucleus accumbens. The nucleus accumbens is a key brain region involved in reward processing. Chronic stimulant use leads to excessive dopamine release, which overstimulates dopamine receptors. In response, the brain reduces the number of ....