We have investigated the effectiveness of two bone conducted stimuli in producing vestibular evoked myogenic potentials (VEMPs) following stimulation along mid-sagittal skull sites. Twenty subjects (mean age 24, range: 18 to 34 years; 6 males; 14 females) were studied using a smoothed impulse and a 500 Hz tone burst applied to Nz, Fpz, AFz, Fz, FCz and Cz with both compressive and rarefactive onset phases. Cervical (cVEMPs) and ocular VEMPs (oVEMPs) were recorded as well as linear acceleration in 3 axes. cVEMPs evoked by 500 Hz showed no change in response polarity to either stimulus location or phase. cVEMPs evoked by the impulsive stimulus showed larger initial peak amplitudes at AFz and Fz using compressive stimuli and differences in initial peak latency between the two phases. In contrast, amplitude, latency and response polarity for oVEMPs were markedly affected by stimulus location and phase which were similar for both BC stimuli, with little correlation with induced acceleration of the head. Latencies were earliest at AFz and Fz where compressive onset stimuli evoked an initial negativity (average latency 8.6-11.0 ms). At other sites compressive onset stimuli usually evoked oVEMPs with an initial positivity. We conclude that both 500 Hz and impulsive stimuli are effective means of evoking cVEMPs and oVEMPs from mid sagittal skull sites. The effects depend upon both location and phase and differ for oVEMPs and cVEMPs. Initial negativities for oVEMPs following compressive stimuli were most consistently obtained using the AFz and Fz sites.
- bone conduction
- Copyright © 2016, Journal of Applied Physiology