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Top: average normalized peak-to-peak amplitude (VEMPn). Bottom: average VEMP inhibition depth (VEMPid). Data from 500 (a, e), 750 (b, f), 1,000 (c, g) and 2,000 Hz (d, h) for multiple sound levels. Error bars represent 95% confidence intervals. The effect of frequency is significantly larger at the higher sound levels, and the effect of stimulus level is significantly larger in the dehiscent group compared to the other groups.
