What does the nucleus accumbens do?

The nucleus accumbens — Latin for leaning nucleus — is a cluster of neurons* that acts as a liaison between the limbic system and the central gray nuclei. It’s a paired structure, like the hippocampus, and is involved in the brain’s reward system, releasing dopamine and other neurotransmitters that produce a feeling of pleasure. For this reason, it also plays a large part in addictive behavior, appetitive eating, and behavioral motivation in general. It has a role in fear responses and the placebo effect as well. Feel free to blame it for the bad things you do.

* In brain physiology, a nucleus is a cluster of neurons that perform functions together. Outside of the brain, such a cluster is called a ganglion. Inside of the brain, it’s too dark to read.