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Group mean normalized distance traveled during reinforced IRTs and longer unreinforced IRTs after saline or amphetamine injection. Double asterisks indicate significant differences (p<.01) as determined by analysis of variance. Horizontal brackets show the groupings of data to which the double asterisks pertain (e.g., the main effect of saline versus amphetamine was significant). Vertical brackets on each bar show +/− 1 SEM..
