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Mean (± SEM) percent change in preference for methamphetamine from not pre-exposed, no-shift controls on (a) day 1, (b) days 1-7, and (c) days 8-14 of two-bottle choice testing. * p < 0.05 in (a) indicates a significant difference from not pre-exposed shift and not-pre-exposed no-shift groups; * p < 0.05 in (b) indicates a significant difference from methamphetamine pre-exposed no-shift and not-pre-exposed shift groups. n = 8 animals/group.
