Short-term learning plotted as percentage correct for blocks of seven trials in which the location of the S+ port was held constant. Stimulus duration was 0.05 s for trials 1, 3, 5, and 7 and 3.0 s for trials 2, 4, and 6 of each block. Rats with CPu lesions did not complete a sufficient number of trials for inclusion in analyses. There were few errors for 3.0 s stimuli. Percentage correct for the 0.05 s stimuli increased incrementally as they were repeated. Rats in the mCPu group were less accurate on average but exhibited increased accuracy with repetition comparable with other groups. The performances of the control, VSt, and lCPu groups were highly similar and thus overlap extensively in this figure. Error bars represent SEM.