Nucleus accumbens:

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.

Read more: Know your brain - Nucleus accumbens

                      Know your brain - Striatum

Watch this 2-Minute Neuroscience video to learn more about the reward system.