Figure 3
Inter-individual differences in activity of rats measured during the EXT schedule: A: distribution of individual scores of rats (mean number of presses over the last 5 sessions) and selection of hypoactive (LOWEXT, scores < 8) hyperactive (HIGHEXT, scores > 20) and intermediate rats (INTFI). B: Mean number of lever presses by each group during the 5 min EXT component as a function of 1 min segments of the EXT period.