Abstract
The developmental changes of distortion product otoacoustic emissions (DPOAEs) and
transient evoked otoacoustic emissions (TEOAEs) were evaluated in 275 normal subjects
aged from 1 month to 39 years. The DP-grams showed an M-shaped pattern with peaks
at 1587 Hz and 5042 Hz for all age groups. In subjects younger than 3 years, low frequency
DPOAEs did not rise above the noise floor. The DP levels at high frequency (5042 Hz)
did not change much from infancy to young adulthood (12.9–16.5 dB SPL), however, those
at low and middle frequency significantly decreased with age. Total echo power (TEP)
of TEOAE was greatest in early infancy, decreased rapidly before 6–7 years old, and
then decreased gradually (TEP=16.6−1.9 X ln (age)). Wave reproducibility was constant
across age. The frequency area peak power (FAPP) to middle and high frequency sounds
changed little with age, however, FAPP at low frequency sounds dramatically increased
with age. FAPP at 5000 Hz was relatively depressed levels at each age. The TEOAE value
was more prominent at middle and low frequencies while DPOAE was predominant at high
frequencies. These two measurements may reflect different functions of outer hair
cells in the developing cochlea.
Keywords
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Article info
Publication history
Accepted:
September 24,
1999
Received in revised form:
September 21,
1999
Received:
July 1,
1999
Identification
Copyright
© 2000 Elsevier Science B.V. Published by Elsevier Inc. All rights reserved.
