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A, time courses of MEP amplitude following QPS at various ISIs without priming (mean ±s.e.m.). B, stimulus–response function of QPS-induced plasticity. Normalized amplitudes of MEP measured at 30 min after QPS as a function of the reciprocal of ISI of QPS: mean (±s.e.m.) of baseline. Note that the x-axis is logarithmic. Asterisks denote significant difference from QPS-30 ms (*P < 0.05).
