Time–frequency decomposition of click evoked otoacoustic emissions in children

Mishra, Samarth; Biswal, Milan

doi:10.1016/j.heares.2016.03.003

Cited by 12 publications

(7 citation statements)

References 79 publications

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“…MIRs can contaminate estimates of SFOAE delay, and the fine-structure they produce is mostly non-informative. To focus on the primary reflection at the probe frequency and eliminate longer-latency contributions, various signal processing methods have been implemented (e.g., Konrad-Martin and Keefe, 2005;Schairer et al, 2006;Shera and Bergevin, 2012;Abdala et al, 2014a;Mishra and Biswal, 2016).…”

Section: Sfoae Analysismentioning

confidence: 99%

Swept-tone stimulus-frequency otoacoustic emissions: Normative data and methodological considerations

Abdala

Guardia

Shera

2018

The Journal of the Acoustical Society of America

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Stimulus-frequency otoacoustic emissions (SFOAEs) are reflection-source emissions, and are the least familiar and perhaps most underutilized otoacoustic emission. Here, normative SFOAE data are presented from a large group of 48 young adults at probe levels from 20 to 60 dB sound pressure level (SPL) across a four-octave frequency range to characterize the typical SFOAE and describe recent methodological advances that have made its measurement more efficient. In young-adult ears, SFOAE levels peaked in the low-to-mid frequencies at mean levels of ∼6-7 dB SPL while signal-to-noise ranged from 23 to 34 dB SPL and test-retest reliability was ±4 dB for 90% of the SFOAE data. On average, females had ∼2.5 dB higher SFOAE levels than males. SFOAE input/output functions showed near linear growth at low levels and a compression threshold averaging 35 dB SPL across frequency. SFOAE phase accumulated ∼32-36 cycles across four octaves on average, and showed level effects when converted to group delay: low-level probes produced longer SFOAE delays. A "break" in the normalized SFOAE delay was observed at 1.1 kHz on average, elucidating the location of the putative apical-basal transition. Technical innovations such as the concurrent sweeping of multiple frequency segments, post hoc suppressor decontamination, and a post hoc artifact-rejection technique were tested.

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Section: Sfoae Analysismentioning

confidence: 99%

Swept-tone stimulus-frequency otoacoustic emissions: Normative data and methodological considerations

Abdala

Guardia

Shera

2018

The Journal of the Acoustical Society of America

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“…In addition to long-latency MIRs, early components of the SFOAE can be contaminated by the probe and suppressor, which overlap in time. To focus on the main reflection site, various signal processing methods have been implemented (e.g., Abdala, Guérit, Luo, & Shera, 2014; Konrad-Martin & Keefe, 2005; Mishra & Biswal, 2016; Schairer, Ellison, Fitzpatrick, & Keefe, 2006; Shera & Bergevin, 2012). We applied the inverse fast Fourier transform (FFT) to extract the SFOAE and eliminate these artifacts as described below.…”

Section: Methodsmentioning

confidence: 99%

Swept-Tone Stimulus-Frequency Otoacoustic Emissions in Human Newborns

2019

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Several types of otoacoustic emissions have been characterized in newborns to study the maturational status of the cochlea at birth and to develop effective tests of hearing. The stimulus-frequency otoacoustic emission (SFOAE), a reflection-type emission elicited with a single low-level pure tone, is the least studied of these emissions and has not been comprehensively characterized in human newborns. The SFOAE has been linked to cochlear tuning and is sensitive to disruptions in cochlear gain (i.e., hearing loss) in adult subjects. In this study, we characterize SFOAEs evoked with rapidly sweeping tones in human neonates and consider the implications of our findings for human cochlear maturation. SFOAEs were measured in 29 term newborns within 72 hr of birth using swept tones presented at 2 oct/s across a four-octave frequency range (0.5–8 kHz); 20 normal-hearing young adults served as a control group. The prevalence of SFOAEs in newborns was as high as 90% (depending on how response “presence” was defined). Evidence of probe-tip leakage and abnormal ear-canal energy reflectance was observed in those ears with absent or unmeasurable SFOAEs. Results in the group of newborns with present stimulus-frequency emissions indicate that neonatal swept-tone SFOAEs are adult-like in morphology but have slightly higher amplitude compared with adults and longer SFOAE group delays. The origin of these nonadult-like features is probably mixed, including contributions from both conductive (ear canal and middle ear) and cochlear immaturities.

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“…OAE latency is often estimated using various time–frequency analysis methods (e.g. [ 46 – 49 ]). However in some recent studies of TBOAEs, a much simpler approach based on the Hilbert transform has been used (e.g.…”

Section: Methodsmentioning

confidence: 99%

Otoacoustic emissions from ears with spontaneous activity behave differently to those without: Stronger responses to tone bursts as well as to clicks

2018

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It has been reported that both click-evoked otoacoustic emissions (CEOAEs) and distortion product otoacoustic emissions (DPOAEs) have higher amplitudes in ears that possess spontaneous otoacoustic emissions (SOAEs). The general aim of the present study was to investigate whether the presence of spontaneous activity in the cochlea affected tone-burst evoked otoacoustic emissions (TBOAEs). As a benchmark, the study also measured growth functions of CEOAEs. Spontaneous activity in the cochlea was measured by the level of synchronized spontaneous otoacoustic emissions (SSOAEs), an emission evoked by a click but closely related to spontaneous otoacoustic emissions (SOAEs, which are detectable without any stimulus). Measurements were made on a group of 15 adults whose ears were categorized as either having recordable SSOAEs or no SSOAEs. In each ear, CEOAEs and TBOAEs were registered at frequencies of 0.5, 1, 2, and 4 kHz, and input/output functions were measured at 40, 50, 60, 70, and 80 dB SPL. Global and half-octave-band values of response level and latency were estimated. Our main finding was that in ears with spontaneous activity, TBOAEs had higher levels than in ears without. The difference was more apparent for global values, but were also seen with half-octave-band analysis. Input/output functions had similar growth rates for ears with and without SSOAEs. There were no significant differences in latencies between TBOAEs from ears with and without SSOAEs, although latencies tended to be longer for lower stimulus levels and lower stimulus frequencies. When TBOAE levels were compared to CEOAE levels, the latter showed greater differences between recordings from ears with and without SSOAEs. Although TBOAEs reflect activity from a more restricted cochlear region than CEOAEs, at all stimulus frequencies their behavior still depends on whether SSOAEs are present or not.

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Time–frequency decomposition of click evoked otoacoustic emissions in children

Cited by 12 publications

References 79 publications

Swept-tone stimulus-frequency otoacoustic emissions: Normative data and methodological considerations

Swept-tone stimulus-frequency otoacoustic emissions: Normative data and methodological considerations

Swept-Tone Stimulus-Frequency Otoacoustic Emissions in Human Newborns

Otoacoustic emissions from ears with spontaneous activity behave differently to those without: Stronger responses to tone bursts as well as to clicks

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