Since dopamine is primarily an inhibitory neurotransmitter involved in voluntary movement, individuals who are deficient in dopamine would exhibit

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Dopamine deficiency is associated with uncontrollable movement, also known as dyskinesia. This is the hallmark symptom of Parkinson's disease, which is caused by a loss of dopamine-secreting neurons in the substantia nigra region of the brain. Without enough dopamine to regulate movement, individuals with Parkinson's may experience tremors, rigidity, and difficulty initiating and coordinating voluntary movements.

Since Dopamine Is Primarily an Inhibitory Neurotransmitter Involved in Voluntary