It is surely no coincidence that much of the activity Dr Okubo found is in that characteristically human part of the brain, the enlarged cerebral cortex, rather than in the limbic system.

ECONOMIST: Emotion is essential to human survival

By contrast, Paxil ramped up activity in the cortex, while dampening activity in the limbic parts of the brain responsible for emotions.

FORBES: Magazine Article

One of serotonin's jobs is to show growing nerve cells how they should connect from the frontal cortex, where reasoning takes place, to the limbic system, the seat of many emotional responses.

ECONOMIST: Diet and the unborn child