Acoustic distortion products (ADP) from the ears of term infants and young adults using low stimulus levels

Brown, Ann M.; Sheppard, Sarah; Russell, Paul T.

doi:10.3109/03005369409086577

Cited by 31 publications

(15 citation statements)

References 23 publications

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“…There is evidence to suggest that infants and children may have DPOAE of greater amplitude than adults (Dorn et al, 1998;Brown et al, 1994;Prieve et al, 1997). These effects are small, however, and do not reach statistical signi cance in many of the studies.…”

Section: Introductionmentioning

confidence: 84%

Normal values for distortion product otoacoustic emissions in children: a study using primary levels previously demonstrated to be optimum for identification of hearing loss

Brook¹,

Trussell²,

Hilton³

et al. 2001

Scandinavian Audiology

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No published data exist for normal values of distortion product otoacoustic emissions (DPOAE) in children at primary levels f1 = 65 dB and f2 = 55 dB SPL. These primary levels have been previously demonstrated to be optimal for identi cation of hearing impaired ears in adults. A total of 102 normal children underwent audiological assessment, including exclusion of middle ear disease, pure tone audiometry and DPOAE DP-grams (primaries L1/L2 = 65/55 dB SPL, f1:f2 = 1.22). There was a statistically signi cant decrease in DPOAE amplitude with increasing age. DPOAE amplitude was also dependent on the frequency of f2. However, there was wide inter-and intra-individual variation in DPOAE amplitude at different frequencies of f2. There was also a large overlap between the range of values of DPOAE amplitude between the adjacent age groups. Detailed assessment of DPOAE in children is feasible in the clinical setting. These normal values should prove invaluable in future studies; however, the large range of normal values means that cross-sectional studies may not be able to detect small variations in cochlear function.

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Section: Introductionmentioning

confidence: 84%

Normal values for distortion product otoacoustic emissions in children: a study using primary levels previously demonstrated to be optimum for identification of hearing loss

Brook¹,

Trussell²,

Hilton³

et al. 2001

Scandinavian Audiology

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“…Brown et al ͑1994͒ reported that DPOAE levels in neonates were approximately 10 dB higher than they were in a group of adults for f 2 frequencies ranging from 1000 to 8000 Hz, but only the difference at the f 2 frequency of 1000 Hz was significant. Bergman et al ͑1995͒ also reported that DPOAE levels measured from graduates of the neonatal intensive care unit ͑NICU͒ and term neonates were higher than those from a group of older children and adults across a broad frequency span, but did not indicate whether these differences were statistically significant.…”

Section: Introductionmentioning

confidence: 86%

Basic characteristics of distortion product otoacoustic emissions in infants and children

Prieve

Fitzgerald

Schulte

et al. 1997

The Journal of the Acoustical Society of America

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Distortion-product otoacoustic emissions at the 2 f1-f2 frequency (DPOAEs) are being advocated as a clinical tool for diagnosis of peripheral auditory pathology. Because they can be measured quickly and noninvasively, they may be an excellent method for identifying hearing loss in infants and children. However, few studies have examined the characteristics of DPOAEs in infants and children or detailed if, and how, their responses differ from those of adults. The purpose of the current study was to determine basic characteristics of DPOAEs in infants, toddlers, children, and young adults and to define any differences among age groups. An additional goal was to ensure that the presence of spontaneous otoacoustic emissions (SOAEs) did not confound any developmental effect. DPOAE input/output (I/O) functions at seven f2 frequencies and SOAEs were measured from one ear of 196 subjects. Children aged less than 1 yr had significantly higher mean DPOAE levels than older children and adults, and children aged 1-3 yr had higher mean DPOAE levels than teens and adults. These differences were dependent on frequency but were independent of f2 level and SOAE status. At every f2 frequency, groups of individuals having SOAEs had higher mean DPOAE levels than those not having SOAEs.

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“…A decade of work from various laboratories has found that DPOAE-based measures of cochlear function are not completely adult-like in human infants ͑Brown et al, 1994;Lasky, 1998;Abdala, 2001b. Brown and colleagues ͑1994͒ reported immature cochlear filtering in newborns at 4000 Hz, as measured by DPOAE f 2 / f 1 -ratio functions.…”

Section: A Dpoaes To Study Maturation Of Auditory Peripheral Functionmentioning

confidence: 96%

A comparative study of distortion-product-otoacoustic-emission fine structure in human newborns and adults with normal hearing

Dhar

Abdala

2007

The Journal of the Acoustical Society of America

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Distortion product otoacoustic emissions (DPOAE) measured in human newborns are not adult-like. More than a decade of work from various investigators has created a well-developed body of evidence describing these differences but the putative anatomy or physiology has only been partially explained. Recently, Abdala and Keefe [J. Acoust. Soc. Am. 120, 3832-3842 (2006)] have identified outer and middle ear immaturities that at least partially describe the differences observed between newborn and adult input-output functions and suppression tuning curves. DPOAE fine structure characteristics and their maturation have not been examined to any extent in the literature. Fine structure characteristics in two groups of ten newborns and young adults with normal hearing sensitivity are compared here. Consistent with previous reports, the newborns show higher DPOAE levels; greater fine structure depth and wider fine structure spacing is also observed in the newborns. Differences in fine structure morphology are also observed between the two age groups. While some of these findings are attributable to an immature outer and middle ear system in the newborns, it is argued that some observed differences in fine structure characteristics might be due to remnant immaturities in passive motion of the basilar membrane in the newborn cochlea.

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Acoustic distortion products (ADP) from the ears of term infants and young adults using low stimulus levels

Cited by 31 publications

References 23 publications

Normal values for distortion product otoacoustic emissions in children: a study using primary levels previously demonstrated to be optimum for identification of hearing loss

Normal values for distortion product otoacoustic emissions in children: a study using primary levels previously demonstrated to be optimum for identification of hearing loss

Basic characteristics of distortion product otoacoustic emissions in infants and children

A comparative study of distortion-product-otoacoustic-emission fine structure in human newborns and adults with normal hearing

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