| 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 (Suhara et al, 2001) derived from alcohol and other drugs, as well as from gambling and other risk-taking behaviors (Hodge et al, 1996, 1998; Robbins and Everitt, 1996).
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