Dopamine is both a neurotransmitter and a neurohormone produced in multiple areas of the brain. As a hormone, it is often associated with pleasant experiences. Receiving an unexpected reward may cause your heart to speed up and increase your alertness due to the sudden release of dopamine. As a neurotransmitter, it transmits signals associated with concentration and motor skills. Conditions such as Parkinson’s Disease and schizophrenia are associated with an interruption in the brain’s production of dopamine.