Don Keith Brown

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This study examined gender differences in f(1)- and f(2)-sweep distortion product otoacoustic emission (DPOAE) phase delay measures in 60 normal-hearing human adults. Phase delay measures were obtained at six different f(2) frequencies ranging from 1.1 to 6.0 kHz (f(2)/f(1) ratios were 1.1-1.3). Primary levels for f(2) were 45 and 50 dB SPL (f(1)f(2)).(More)
A method is presented here in which cochlear traveling wave delays are estimated through the measurement of distortion product emission phase (DPE) responses. This method assumes that the site of generation of DPEs is at the f2 place. Eighteen adult female and 18 adult male human ears, all with normal hearing, underwent DPE testing. For each ear, DPE phase(More)
Distortion product emission (DPE) growth functions, demographic data, and pure tone thresholds were recorded in 229 normal-hearing and hearing-impaired ears. Half of the data set (115 ears) was used by a discriminant analysis routine to classify DPE and demographic features into either a normal pure tone threshold (PTT) group or an impaired PTT group (PTT(More)
OBJECTIVE The objective of this study was to evaluate the accuracy and cost effectiveness of three different methods of hearing screening in newborns. DESIGN A prospective, randomized cohort design was used. One hundred and five newborns were tested in this preliminary study. SETTING The study was conducted in a tertiary care hospital setting in both(More)
Phase measurements of distortion product otoacoustic emissions (DPOAE) provide an estimate of round-trip travel times in the cochlea. This study examined differences in f1- and f2-sweep round-trip delays estimated from DPOAE phase responses in 20 normal-hearing adult human subjects as a function of f2 frequency and sound intensity. Eight different f2(More)
This study examined cochlear filter response properties derived from f1- and f2-sweep phase delay difference measures in 60 normal hearing human adults. Seven different f2 frequencies ranging from 1.1 to 9.2 kHz were presented (f2/f1 ratios of 1.1-1.3). F2 intensity level was varied in 5 dB steps from 30 to 50 dB SPL (the level of f1 was 15 dB above the(More)
Functional aspects of human cochlear maturation were studied with distortion-product otoacoustic emissions (DPE). Cochlear travel times were measured on basis of the phase-frequency relationship for DPEs in 54 term-born babies (36 to 42 weeks conceptional age [CA]) for f2 frequencies from 1.7 to 10 kHz, and the results were compared with a normaltive data(More)