Comparison of umbo velocity in air- and bone-conduction

详细信息    查看全文

• 作者：Christof R??sli ; David Chhan ; Christopher Halpin ; John J. Rosowski
• 刊名：Hearing Research
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：290
• 期：1-2
• 页码：83-90
• 全文大小：513 K

文摘

This study investigates the ossicular motion produced by bone-conducted (BC) sound in live human ears. Laser Doppler Vibrometry was used to measure air conduction (AC)- and BC-induced umbo velocity (V_U) in both ears of 10 subjects, 20 ears total. Sound pressure in the ear canal (P_EC) was measured simultaneously. For air conduction, V_U at standard hearing threshold level was calculated. For BC, ¦¤V was defined as the difference between V_U and the tympanic ring velocity (an estimate of the skull velocity measured in the ear canal). ¦¤V and P_EC at BC standard hearing threshold were calculated. ¦¤V at standard BC threshold was significantly smaller than V_U at standard AC threshold between 500?Hz and 2000?Hz. Ear canal pressure at BC threshold tended to be smaller than for AC below 3000?Hz (with significant differences at 1000?Hz and 2000?Hz). Our results are most consistent with inertia of the ossicles and cochlear fluid driving BC hearing below 500?Hz, but with other mechanisms playing a significant role at higher frequencies. Sound radiated into the external ear canal might contribute to BC hearing at 3000?Hz and above.