TY - JOUR
T1 - Ossicular motion related to middle ear transmission delay in gerbil
AU - De La Rochefoucauld, Ombeline
AU - Kachroo, Puja
AU - Olson, Elizabeth S.
N1 - Funding Information:
We thank John Rosowski and an anonymous reviewer for their helpful comments on the manuscript. We are grateful to Mike Ravicz, John Rosowski and Nigel Cooper for sharing the data of Fig. 9 . We also thank Wei Dong, Shyam Khanna, Wim Decraemer, John Rosowski, Glenis Long and Mike Ravicz for many discussions on delays. This work was supported by the NIH/NIDCD ( DC003130 ) and the Emil Capita Foundation .
PY - 2010
Y1 - 2010
N2 - The middle ear transmits sound efficiently from the air in the ear canal (EC) to the fluid filled cochlea. In gerbil, middle ear transmission produces a constant pressure gain between the EC and the cochlea of ~25 dB from 2 to 40 kHz, and a delay-like phase corresponding to a ~25-30 μs delay. The mechanisms by which the air-born signal is collected and delivered to the cochlea are not thoroughly understood, and the source of the delay is controversial. We investigated these issues by observing ossicular motion along a single line of sight, roughly parallel to the EC and perpendicular to the stapes footplate. Measurements were made at the umbo, the long process of the manubrium, across the malleus-incus joint, at the long process of the incus, and the stapes head. While the overall delay between EC pressure and stapes velocity was fairly constant with frequency, subcomponents of the delay were frequency dependent. Up to ~17 kHz, most of the overall delay was between the EC and umbo with a much smaller contribution along the ossicles, whereas in the range from ~17 to 30 kHz, more of the overall delay was along the ossicles.
AB - The middle ear transmits sound efficiently from the air in the ear canal (EC) to the fluid filled cochlea. In gerbil, middle ear transmission produces a constant pressure gain between the EC and the cochlea of ~25 dB from 2 to 40 kHz, and a delay-like phase corresponding to a ~25-30 μs delay. The mechanisms by which the air-born signal is collected and delivered to the cochlea are not thoroughly understood, and the source of the delay is controversial. We investigated these issues by observing ossicular motion along a single line of sight, roughly parallel to the EC and perpendicular to the stapes footplate. Measurements were made at the umbo, the long process of the manubrium, across the malleus-incus joint, at the long process of the incus, and the stapes head. While the overall delay between EC pressure and stapes velocity was fairly constant with frequency, subcomponents of the delay were frequency dependent. Up to ~17 kHz, most of the overall delay was between the EC and umbo with a much smaller contribution along the ossicles, whereas in the range from ~17 to 30 kHz, more of the overall delay was along the ossicles.
UR - http://www.scopus.com/inward/record.url?scp=78649845498&partnerID=8YFLogxK
U2 - 10.1016/j.heares.2010.07.010
DO - 10.1016/j.heares.2010.07.010
M3 - Article
C2 - 20696229
AN - SCOPUS:78649845498
SN - 0378-5955
VL - 270
SP - 158
EP - 172
JO - Hearing research
JF - Hearing research
IS - 1-2
ER -