Which neurotransmitter is associated with pleasure and reward?

The neurotransmitter most commonly associated with pleasure and reward is dopamine.

Dopamine is a chemical messenger used by nerve cells in several brain pathways. In the mesolimbic reward system, dopamine helps encode motivation, reinforcement, attention, and the importance—or salience—of experiences. Unexpected rewards can produce a burst of dopamine activity, helping the brain learn which actions or cues may be worth repeating.

The popular description of dopamine as simply the “pleasure chemical” is incomplete. Modern neuroscience distinguishes “wanting,” or motivational drive, from “liking,” the subjective enjoyment of a reward. Dopamine is especially important for wanting, learning, and reinforcement, although it also contributes to some forms of pleasure. Other brain chemicals and regions participate in pleasurable experiences as well.

Dopamine is not limited to reward. It also helps regulate movement, attention, mood, and hormone-related functions. Loss of dopamine-producing neurons in a part of the midbrain is strongly associated with Parkinson’s disease. Serotonin, endorphins, and oxytocin can influence mood, bonding, or pleasure, but dopamine is the canonical quiz answer for reward signaling.