Dopamine Pathways. In the brain, dopamine plays an important role in the regulation of reward and movement. As part of the reward pathway, dopamine is manufactured in nerve cell bodies located within the ventral tegmental area (VTA) and is released in the nucleus accumbens and the prefrontal cortex. Its motor functions are linked to a separate pathway, with cell bodies in the substantia nigra that manufacture and release dopamine into the striatum (Image Source: Wikipedia)

A recent study published in the journal Frontiers in Human Neuroscience focused on the neurotransmitter dopamine  – —the “pleasure chemical” – in the extroverted brain, finding that the reason extroverts seem to experience stronger positive emotions may be all about how their brains process the memory of rewards.

Reference:

Depue R.A. and Fu Y. Front. On the nature of extraversion: variation in conditioned contextual activation of dopamine-facilitated affective, cognitive, and motor processes. Hum. Neurosci. 13 June 2013