Ocular vestibular evoked myogenic potentials and the importance of the bifid response

Bifid responses are common with respect to evoked potentials. Visual evoked potentials frequently show this phenomenon (Jones and Blume, 1985; Marra, 1990; Rouseff et al., 2005) but are rarely seen in physiologically normal individuals. Their presence often indicates a demyelinating process like multiple sclerosis. Another reason for their presence in visual evoked potentials is interference from a P135 waveform, which is a peripheral half field component (American Clinical Neurophysiology Society, 2006) superimposing onto the visual evoked potential waveform (Halliday, 1993).

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