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A variable-frequency probe-tone acoustic-impedance bridge has been developed to enable an artifact-free pure-tone acoustic reflex study to be carried out on neonates. Contralateral reflex thresholds for pure tones, broadband noise, and filtered noise were measured in 28 newborns aged 4-8 days. The mean reflex threshold for the broadband noise was 73 dB SPL,(More)
Acoustic reflex impedance measurements are made on forty-seven normal and two otosclerotic ears using fixed probe frequencies from 220 to 2000 Hz. In general, the reflex increases the middle ear impedance up to 700 Hz probe frequency and decreases it thereafter. It is postulated that this characteristic is related to removal of the cochlear fluid resistance(More)
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