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    Most of us are familiar with reports of lab animals that, when presented with a lever that provides opioids or cocaine, will press the lever over and over at the expense of food and water (Deneau, Yanagita, and Seevers 1969; Weeks 1962; Deroche-Gamonet, Belin, and Piazza 2004). This paradigm has not only been used by researchers to study drug effects but also entered the culture as an anti-drug parable. In the most famous of these types of studies (Olds and Milner 1954) the lever wasn't deliveri…Read more