Figure 1

Inter-individual differences in impulsivity of rats measured in the FCN8 task. A: distribution of individual scores of rats (mean chain length over the last 7 days) and selection of rats with high level of inhibition (HIGH_FCN, scores > 8) low level of inhibition (LOW_FCN, scores < 6) and intermediate levels (INT_FCN); B: distribution (%) of mean chain lengths of efficient (≥ 8) or inefficient chains (< 8) of the three groups. Optimal performance (8) is indicated by the vertical line. C: percentage mean of efficient chains; D: total number of presses per min and E: number of sessions needed to reach the test phase of the three groups. ANOVA (NK): ***, p < .001 for comparisons between LOW and HIGH groups; °°°, p < .001 for comparisons between LOW and INT groups.