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Ipsilateral and contralateral acoustic reflexes were studied in neonates using 220 and 660 Hz probe tones and 500, 1000, 2000, and 4000 Hz activators. Activator sound pressure level was measured in all ears. Ipsilateral and contralateral reflexes were detected three times more frequently with a 660 Hz probe tone than with a 220 Hz probe tone. The maximum detection rate (76%) occurred with 1000 and 2000 Hz ipsilateral activators and the 660 probe tone. There was no significant difference between neonatal and adult ipsilateral thresholds at 500, 1000, and 4000 Hz. Neonatal intrameatal sound pressure levels for ipsilateral activators were found to be significantly higher than would be indicated from the otoadmittance meter manufacturer's specifications.
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