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Effect of stimulus intensity on cVEMPs. In part A, the subject had no response to two trials of AC sound delivered at 95 dB (tone bursts of 500 Hz, 2 ms). Increasing the stimulus intensity to 100 and 105 dB revealed a normal reflex. In part B, a different subject had no response to BC stimulation delivered to the forehead in the midline with stimulus intensity 40 Vpp, but had a normal response to a stronger stimulus.
