OBJECTIVE: To evaluate methods for estimating thresholds of vestibular evoked myogenic potentials (VEMPs) and ocular VEMPs (OVEMPs) produced by impulsive transmastoid acceleration (ITA). DESIGN: VEMPs and OVEMPs were obtained simultaneously from subjects in supine posture with both head and eyes elevated. Thresholds to ITA were measured using four different response identification methods. STUDY SAMPLE: Twelve adult subjects with no history of auditory or vestibular deficits. RESULTS: VEMP and OVEMP thresholds were found within the range of -8 to -26 dB re 0.2 g, with overall VEMP thresholds being lower than OVEMP thresholds by average of 3-10 dB, depending on the method used. CONCLUSION: VEMPs can be obtained at lower ITA stimulation levels than OVEMPs. Threshold values depend on the method used to define response presence.
OBJECTIVE: To evaluate methods for estimating thresholds of vestibular evoked myogenic potentials (VEMPs) and ocular VEMPs (OVEMPs) produced by impulsive transmastoid acceleration (ITA). DESIGN: VEMPs and OVEMPs were obtained simultaneously from subjects in supine posture with both head and eyes elevated. Thresholds to ITA were measured using four different response identification methods. STUDY SAMPLE: Twelve adult subjects with no history of auditory or vestibular deficits. RESULTS: VEMP and OVEMP thresholds were found within the range of -8 to -26 dB re 0.2 g, with overall VEMP thresholds being lower than OVEMP thresholds by average of 3-10 dB, depending on the method used. CONCLUSION: VEMPs can be obtained at lower ITA stimulation levels than OVEMPs. Threshold values depend on the method used to define response presence.
Authors: James G Colebatch; Danielle L Dennis; Sendhil Govender; Peggy Chen; Neil P McAngus Todd Journal: Exp Brain Res Date: 2014-05-18 Impact factor: 1.972