| http://www.w3.org/ns/prov#value | - Natural rewards include satisfaction of physiological drives (e.g. hunger and reproduction) and unnatural rewards are learned and involve satisfaction of acquired pleasures such as hedonic sensations derived from alcohol and other drugs, as well as from gambling and other risk-taking behaviors. (Olsen, 2011).The DRD2 gene is responsible for the synthesis of dopamine D2 receptors (Grady et al., 198
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