Nucleus · one in each half of the brain

Nucleus accumbens

Also called Accumbens, Ventral striatum (main part)

The brain's reward hotspot, turning "I like that" into "I want more".

Open in 3D

The nucleus accumbens sits low and toward the front, where the caudate and putamen meet. It gets bursts of dopamine from the ventral tegmental area whenever something is better than expected. It turns that signal into motivation: the urge to go get food, a hug or a win. Addictive drugs hijack this system, which is why the accumbens is central to addiction research.

Where it is

Deep, low and toward the front of the brain, where the head of the caudate and the putamen join.

What it does

Think of it as the brain's "wanting" engine, revving up whenever something good seems within reach.

Works with

• Ventral tegmental areaSends it the dopamine bursts that signal "better than expected".
• DopamineThe chemical messenger at the heart of its reward and motivation role.
• AmygdalaTells it which cues carry emotional weight, good or bad.
• HippocampusSupplies context, like where and when a reward was found.
• Prefrontal cortexHelps weigh long-term goals against the pull of a quick reward.
• Globus pallidusIts lower part, the ventral pallidum, carries the accumbens' output onward.

When it goes wrong

For learning only, not medical advice. If you have a health concern, talk to a doctor.

Surprising facts

• In 1954, scientists found that rats would press a lever again and again, for long periods, to electrically stimulate reward circuits that include this area.
• Dopamine here often rises when you expect a reward, not just when you get it.
• Many scientists now think dopamine here is more about "wanting" than "liking": rats with little dopamine still enjoy a sweet taste but will not work as hard to get it.

Where the name comes from

Short for the Latin "nucleus accumbens septi", meaning "the nucleus lying against the septum", the thin wall between the brain's fluid-filled spaces.

Learn it in a lesson

• Emotion and rewardFear, drive and the value of things. A short guided lesson in 3D.

Sources

1. 14.3 Neural Circuitry of Drug Reward, OpenStax, Introduction to Behavioral Neuroscience
2. Neuroanatomy of Reward: A View from the Ventral Striatum, Neurobiology of Sensation and Reward, NCBI Bookshelf
3. Deep Brain Stimulation, StatPearls, NCBI Bookshelf

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