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Selection of high impulsive (HI) and low impulsive (LI) rats, based on their indifference points, calculated as an average of the last 4 days of a stable baseline period on the delayed reward task. HI had a significant lower preference for the large reward compared to LI on all but the 0 s delay. HI high impulsive (n = 13), LI low impulsive (n = 12). *p < 0.001
