Natural rewards stimulate dopamine neurotransmission.
Eating something that you enjoy or being stimulated sexually can cause dopamine levels to increase. In these graphs, dopamine is being measured inside the brains of animals. Its increase is shown in response to food or sex cues. This basic mechanism of controlled dopamine release and reuptake has been carefully shaped and calibrated by evolution to reward normal activities critical for our survival.
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National Institute on Drug Abuse (July 1 2008). Natural rewards stimulate dopamine neurotransmission.. In Addiction Science: From Molecules to Managed Care. Retrieved from http://www.drugabuse.gov/publications/addiction-science/why-do-people-abuse-drugs/natural-rewards-stimulate-dopamine-neurotransmission