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. 1999 Feb 1;514(Pt 3):895–903. doi: 10.1111/j.1469-7793.1999.895ad.x

Figure 3. Comparison of intracortical inhibition and facilitation induced by circular and figure-of-eight coils.

Figure 3

A, time course of inhibition (at ISIs of 2-5 ms) and facilitation (at ISIs of 10-25 ms) induced in the BB muscle using a circular (large filled circles) and a focal figure-of-eight (small filled circles) coil. Stimulus intensities as in Fig. 1. Each point corresponds to the mean size (±s.e.m.) of the conditioned MEP in 3 subjects. Changes induced by the conditioning subthreshold stimuli were remarkably similar with either coil. B, time course of inhibition and facilitation in the OP (○) and BB (•) muscles. A focal figure-of-eight coil was used and stimulus intensity was set at 80 % of the rest MTh for the conditioning stimulus and at 125 % of the MTh for the test stimulus for both muscles. Each point corresponds to the mean size (±s.e.m.) of the conditioned MEP in 2 subjects. In BB, inhibition at ISIs of 2-5 ms was less marked and facilitation at ISIs of 10-25 ms was more marked than in the OP.