As mentioned earlier (image 3), information is communicated in the brain via a process called neurotransmission. Neurotransmission involves a variety of chemical substances called "neurotransmitters." One such neurotransmitter is called "dopamine." In the normal communication process, dopamine is released by a neuron into the synapse (the small gap between neurons). The dopamine then binds with specialized proteins called "dopamine receptors" (see image) on the neighboring neuron, thereby sending a signal to that neuron.
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National Institute of Drug Abuse (2007). 6: Neurotransmission. In Understanding Drug Abuse and Addiction: What Science Says. Retrieved from http://www.drugabuse.gov/publications/teaching-packets/understanding-drug-abuse-addiction/section-i/6-neurotransmission
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