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. 2009 Sep 30;35(2):388–400. doi: 10.1038/npp.2009.142

Figure 5.

Figure 5

Performance on measures of ‘impulsive choice'. (a) Performance on the delay-discounting task averaged across the last five test sessions (days 26–30) for bHR (n=13, black circles) and bLR (n=13, open circles) rats. Data represent the mean+SEM for the percent of trials on which the larger delayed reward was chosen and are illustrated for 0, 3, 6, 12, and 24 s intervals. bHR rats tended to choose the larger delayed reward more than bLR rats across delay intervals. (b) Performance on the probabilistic-choice task averaged across the last five test sessions (days 20–24) for bHR (n=18) and bLR (n=12) rats from S17. Data represent the mean+SEM for the percent of trials on which the probabilistic lever was chosen at probabilities 1, 0.75, 0.5, 0.375, and 0.125. bHR and bLR rats did not significantly differ on this task, but both groups showed a decrease in their choice for the larger reward with decreasing probabilities.