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When rats are forced to drink a morphine solution as their only source of fluid, they eventually reverse their initial preference and drink more morphine than water in a two-bottle preference test. The cause of this shift in preference was examined with the taste reactivity test which involves the analysis of fixed action patterns elicited by taste solutions infused into rats' mouths. Three morphine concentrations and two levels of motivation were studied. A greater percentage of ingestivedoi:10.1037//0735-7044.99.2.290 pmid:3843713 fatcat:tff2cwntlbh7lmrdm37apkhqre