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Abstract
The purpose of this investigation was to compare the effects of monaural and binaural stimulation on unilaterally-measured vestibular evoked myogenic potential (VEMP) magnitude and latency. The subjects were eighteen normal-hearing adults with no history of vestibular disease. Monaural VEMPs were acquired with air-conducted (AC) and bone-conducted (BC) 500 Hz tone bursts presented at 95 dB nHL and 70 dB nHL, respectively. These stimuli were simultaneously paired with 95 dB nHL contralateral tone bursts at 250, 500, 750, or 1000 Hz during acquisition of binaural VEMPs. Results indicated that AC-VEMP relative magnitudes decreased in each of the binaural conditions compared to the monaural condition. However, no changes in relative magnitude between conditions occurred for BC-VEMPs. Similar latencies were observed for monaural and binaural VEMPs. Differences in bilateral interaction seen between the AC-VEMP and BC-VEMP conditions are consistent with modification of sound transmission through the ear during presentations of binaural sound.
| Acronyms | ||
| AC | = | Air-conducted |
| Ag/AgCl | = | Silver/silver chloride |
| ANOVA | = | Analysis of variance |
| BC | = | Bone-conducted |
| dB nHL | = | Decibels normal hearing level |
| EMG | = | electro-myogram |
| ms | = | Millisecond |
| s | = | Second |
| SCM | = | Sternocleidomastoid |
| VEMP | = | Vestibular evoked myogenic potential |
| Acronyms | ||
| AC | = | Air-conducted |
| Ag/AgCl | = | Silver/silver chloride |
| ANOVA | = | Analysis of variance |
| BC | = | Bone-conducted |
| dB nHL | = | Decibels normal hearing level |
| EMG | = | electro-myogram |
| ms | = | Millisecond |
| s | = | Second |
| SCM | = | Sternocleidomastoid |
| VEMP | = | Vestibular evoked myogenic potential |
Sumario
El propósito de esta investigación fue comparar el efecto de la estimulación monoaural y binaural en la magnitud y la latencia de los potenciales evocados vestibulares miogénicos. Los sujetos fueron dieciocho adultos normoyentes sin antecedentes de patología vestibular. Se obtuvieron VEMP con burst tonales de 500 Hz por vía aérea (AC) y vía ósea (BC) a 95 dB nHL y 70 dB nHL, respectivamente. Estos estímulos fueron pareados simultáneamente con tonos bust contralaterales a 95 dB nHL a 250, 500, 750 y 1000 Hz para la adquisición de VEMP binaurales. Los resultados indican que la magnitud relativa de los AC-VEMP decrece en cada una de las condiciones binaurales comparado con la condición monoaural. Sin embargo, no hubo cambios en la magnitud relativa entre condiciones en los BC-VEMP. Se observaron latencias similares para VEMP monoaural y binaural. Las diferencias en la interacción bilateral observada entre las condiciones de los AC-VEMP y BC-VEMP son consistentes con la modificación en la transmisión sonora a través del oído durante la presentación del sonido binaural.