ERP generation elicited by old and new objects at latency of 250-350, 350-450, 450-550, and 550-650 ms after stimulus onset. Under the null hypothesis that there are no regional specific generators, the current density will be distributed around global mean by virtue of the global normalization. Under the alternate hypothesis of a regionally specific generator, the mean current density will be significantly different from global mean. These images were thresholded at t = 14.75 (P < 0.05 family wise error, extent k = 50). Right panel demonstrates reductions in cortical sources by old objects in the right middle occipital gyrus (BA 18, 19)/cuneus (BA 17), right fusiform gyrus (BA 37), left superior temporal gyrus (BA 22) and right inferior frontal gyrus (BA 45) at250-350, 350-450, 450-550, and 550-650 ms post-stimulus, respectively (t = 3.36, P < 0.005 uncorrected, extent k = 50). L/A: left anterior, R/P: right posterior.