Dopamine is a neurotransmitter with a vital role in several functions of the brain: sleep, mood, motivation, behavior, reward, cognition, attention and voluntary movements. As a result, any type of stress can be a significant influence on the cerebral dopaminergic (DA) system. It can also be defned as A neurotransmitter to do with motor behaviour and is implicated in a number of mental conditions.

DOPAMINE (DA): "Dopamine is a neural transmitter that causes many mental conditions if it is not working correctly."