Nucleus accumbens:

General location of the nucleus accumbens (red dot).

subcortical nucleus that is part of the basal ganglia and thought to play an important role in motivation, reward, and addiction. The nucleus accumbens is also considered part of the striatum.

Learn more:

Know your brain - Nucleus accumbens

Know your brain - Striatum

2-Minute Neuroscience: Nucleus Accumbens