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Shorter spike durations characterize a population of rapid-firing VTA neurons with GABA characteristics (Steffensen et al. 1998). To increase the probability of GABA neuron selection, we excluded units with half-AP durations >0.5 ms (gray bars) to form a group identified as high-firing/short-duration neurons, using 1 SD as a cutoff between short- and long-duration units.
