Cai Ken Y, Rosengren Sally M, Colebatch James G
Prince of Wales Clinical School and Neuroscience Research Australia, University of New South Wales, Sydney, N.S.W., Australia.
Audiol Neurootol. 2011;16(5):277-88. doi: 10.1159/000321988. Epub 2010 Dec 11.
Sinusoidal forces with frequencies of 100 and 500 Hz and initial positive or negative polarities were delivered to the mastoids and Fz in normal subjects. We investigated whether the cVEMPs and oVEMPs evoked were sensitive to the polarity (phase) of vibration. With mastoid stimulation at 100 Hz, medial head acceleration produced cVEMPs with earlier latency (15.5 ms) than lateral acceleration (19.7 ms) and oVEMPs with later latency (13.8 ms) than lateral acceleration (10.6 ms). As the stimulus frequency increased, the difference in latency decreased, but was still present at 500 Hz. A similar pattern occurred following stimulation at Fz. Our results show that the initial direction of bone-conducted vibration affects both cVEMP and oVEMP properties even at relatively high frequencies.
向正常受试者的乳突和Fz施加频率为100和500Hz、初始极性为正或负的正弦力。我们研究了诱发的颈肌前庭诱发肌源性电位（cVEMPs）和眼肌前庭诱发肌源性电位（oVEMPs）是否对振动的极性（相位）敏感。在100Hz乳突刺激时，内侧头部加速度产生的cVEMPs潜伏期（15.5ms）比外侧加速度产生的潜伏期（19.7ms）更早，oVEMPs潜伏期（13.8ms）比外侧加速度产生的潜伏期（10.6ms）更晚。随着刺激频率增加，潜伏期差异减小，但在500Hz时仍存在。在Fz刺激后也出现类似模式。我们的结果表明，即使在相对高频时，骨传导振动的初始方向也会影响cVEMP和oVEMP特性。
