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Bar graphs show grand means of SICI across interstimulus intervals of 2 and 3 ms at baseline and 1.5 h (diazepam) and 2 h (lorazepam) after drug administration. Error bars are standard deviations. SICI is expressed as the amplitude of the conditioned MEP normalised to the unconditioned test MEP (y-axis). Lorazepam and diazepam increase SICI significantly and to similar extents (*P < 0.05).
