Dopamine is involved in a variety of brain functions and pathways, and produces both excitatory and inhibitory postsynaptic potentials. Dopamine is synthesized in the presynaptic neuron from the amino acids phenylalanine and tyrosine. "Phasic" dopamine release is characterized by burst firing and is thought to occur in response to behavioral stimuli, such as those that may predict reward. In contrast, "tonic" dopamine release is slow and irregular. Dopamine is released from... [continues]
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