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Wheelrunning suppression is impaired when IFIs are short. Magnitude, indicated by the maximal percent change from baseline, is equivalent for all groups, but duration varies with the IFI of the stimulus pattern. The effects of flashes are shown in comparison with that elicited by a 5 min light pulse (□) administered beginning at time zero, as indicated by the open bar. All other groups received 10 flashes delivered with the IFIs indicated, the first flash delivered at time zero.
