Nucleus Accumbens:

The nucleus accumbens — a brain region deep in the forebrain’s ventral striatum — is considered the brain’s pleasure center. It processes reward signals that contribute to pleasure, motivation, goal-directed behavior — and addiction due to its response to dopamine release when experiencing rewarding stimuli like food, sex, or drugs. Dysregulation is also linked to depression, anxiety, and obsessive-compulsive disorder (OCD).