Abstract
Effect of changes in stimulus levels of both lower (f1) and higher (f2) stimulus tones on phases of 2f1-f2 component of the distortion product otoacoustic emission (DPOAE) was examined in five normal hearing adults. The f2 was fixed at 4004 Hz in all of the measurements, and the stimulus frequency ratio (f2/f1) was varied from 1.15 to 1.3. Change of the level of lower stimulus tone (L1) and the level of higher stimulus tone (L2) showed different effects on the DPOAE phases. The phase lags increased with increasing L1, when f2/f1 was above 1.22, whereas the phase gains increased with increasing L1, when f2/f1 was below 1.22. On the other hand, the difference in L2 minimally affected DPOAE phase at most f1s. The previous studies about basilar membrane vibration revealed that phase lags increase with increasing stimulus level, when the stimulus frequency is below the best frequency, while phase gains increase with increasing stimulus level, when the stimulus frequency is above the best frequency, and the effect of phase change in stimulus level diminished, when the stimulus frequency was far above the best frequency. Based on the comparison between the results of the present study and the previous findings of others concerning basilar membrane vibration, the DPOAE generation site is assumed to be located at apical of the peak of the f2 traveling wave.
| Original language | English |
|---|---|
| Pages (from-to) | 152-158 |
| Number of pages | 7 |
| Journal | Hearing Research |
| Volume | 152 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2001 |
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Keywords
- Basilar membrane vibration
- Cochlear mechanics
- Distortion product
- Otoacoustic emission
- Phase
ASJC Scopus subject areas
- Sensory Systems
Cite this
Effects of changes in stimulus level on phases of distortion product otoacoustic emissions. / Harada, Tatsuhiko; Ogawa, Kaoru; Inoue, Yasuhiro; Kanzaki, Jin.
In: Hearing Research, Vol. 152, No. 1-2, 2001, p. 152-158.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of changes in stimulus level on phases of distortion product otoacoustic emissions
AU - Harada, Tatsuhiko
AU - Ogawa, Kaoru
AU - Inoue, Yasuhiro
AU - Kanzaki, Jin
PY - 2001
Y1 - 2001
N2 - Effect of changes in stimulus levels of both lower (f1) and higher (f2) stimulus tones on phases of 2f1-f2 component of the distortion product otoacoustic emission (DPOAE) was examined in five normal hearing adults. The f2 was fixed at 4004 Hz in all of the measurements, and the stimulus frequency ratio (f2/f1) was varied from 1.15 to 1.3. Change of the level of lower stimulus tone (L1) and the level of higher stimulus tone (L2) showed different effects on the DPOAE phases. The phase lags increased with increasing L1, when f2/f1 was above 1.22, whereas the phase gains increased with increasing L1, when f2/f1 was below 1.22. On the other hand, the difference in L2 minimally affected DPOAE phase at most f1s. The previous studies about basilar membrane vibration revealed that phase lags increase with increasing stimulus level, when the stimulus frequency is below the best frequency, while phase gains increase with increasing stimulus level, when the stimulus frequency is above the best frequency, and the effect of phase change in stimulus level diminished, when the stimulus frequency was far above the best frequency. Based on the comparison between the results of the present study and the previous findings of others concerning basilar membrane vibration, the DPOAE generation site is assumed to be located at apical of the peak of the f2 traveling wave.
AB - Effect of changes in stimulus levels of both lower (f1) and higher (f2) stimulus tones on phases of 2f1-f2 component of the distortion product otoacoustic emission (DPOAE) was examined in five normal hearing adults. The f2 was fixed at 4004 Hz in all of the measurements, and the stimulus frequency ratio (f2/f1) was varied from 1.15 to 1.3. Change of the level of lower stimulus tone (L1) and the level of higher stimulus tone (L2) showed different effects on the DPOAE phases. The phase lags increased with increasing L1, when f2/f1 was above 1.22, whereas the phase gains increased with increasing L1, when f2/f1 was below 1.22. On the other hand, the difference in L2 minimally affected DPOAE phase at most f1s. The previous studies about basilar membrane vibration revealed that phase lags increase with increasing stimulus level, when the stimulus frequency is below the best frequency, while phase gains increase with increasing stimulus level, when the stimulus frequency is above the best frequency, and the effect of phase change in stimulus level diminished, when the stimulus frequency was far above the best frequency. Based on the comparison between the results of the present study and the previous findings of others concerning basilar membrane vibration, the DPOAE generation site is assumed to be located at apical of the peak of the f2 traveling wave.
KW - Basilar membrane vibration
KW - Cochlear mechanics
KW - Distortion product
KW - Otoacoustic emission
KW - Phase
UR - http://www.scopus.com/inward/record.url?scp=0035134152&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035134152&partnerID=8YFLogxK
U2 - 10.1016/S0378-5955(00)00246-X
DO - 10.1016/S0378-5955(00)00246-X
M3 - Article
C2 - 11223289
AN - SCOPUS:0035134152
VL - 152
SP - 152
EP - 158
JO - Hearing Research
JF - Hearing Research
SN - 0378-5955
IS - 1-2
ER -