Individual variation in the propensity to approach the lever-CS or food cup after 5 days of Pavlovian training. J. MeyerPaul LovicVedran T. SaundersBenjamin M. YagerLindsay B. FlagelShelly D. MorrowJonathan E. RobinsonTerry 2013 <p>The number of lever deflections (A) and food cup entries (B) is shown for 1,878 individual rats (Subject Number), with the order of the cases randomized so the values are not clustered. Note that there is enormous individual variation in the preferred response.</p>