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Linear-regression slopes (mean ± 1 SD) for nonnormalized amplitudes (top; nV/min) and latencies (bottom; µs/min) as a function of time. Two response peaks represent peripheral (P1N1) and central (P2N2) components of the VsEP amplitudes, whereas response peaks P1 and P2 represent peripheral and central components of the VsEP latencies, respectively. Solid circles, control group; open circles, ketorolac group.
