Individual differences and the reliability of 2F1-FZ distortion product otoacoustic emissions: Effects of time-of-day, stimulus variables, and gender

Author(s): McClelland, W. A., Weiner, J., McFarland, D. J.

Journal/Book: J Speech Hear Res. 1996; 39: 10801 Rockville Pike Rd, Rockville, MD 20852-3279. Amer Speech-Lang-Hearing Assn. 1138-1148.

Abstract: Distortion product otoacoustic emissions (DPOAEs) measured from the ear canal can be a sensitive tool to detect changes in cochlear function over time. However, if multiple-measurement procedures are to be useful clinically, testing needs to be reliable and sources of variability within individuals should be known. Herein, the influence oi time-of-day (TOD), stimulus frequency, stimulus sound pressure level (SPL), and gender were evaluated on 2f1-f2 DPOAE amplitude in 16 adult volunteers with normal hearing, The effects of oral temperature and resting-pulse rate were also assessed. This study demonstrated a TOD main effect, with a period approximating one cycle-per-day. The magnitude of this effect averaged less than one dB and was not dependent on stimulus (frequency or SPL) or participant variables (gender, oral temperature, or resting-pulse rate), nor was it synchronized to a particular point-in-time, Stimulus level and gender effects on DPOAEs across frequency were also observed, Using generalizability theory (GT), DP iso-level/frequency profiles (DPILFPs) were found to be reliable measures within-subjects over a contiguous 24-hour time period. Significant and reliable between-subject differences were also documented. This study demonstrates the influence of stimulus and participant variables, quantifies the within-subject reliability over a 24-hour lime period, and confirms that significant and reliable between-subject differences exist on DPOAEs across frequency; SPL, and gender.

Note: Article Cacace AT, Albany Med Coll, Dept Surg, Div Otolaryngol, 47 New Scotland Ave, Albany,NY 12208 USA

Keyword(s): distortion product otoacoustic emissions; individual differences; reliability gender effects; circadian rhythm; MIDDLE-EAR PRESSURE; AUDITORY-SENSITIVITY; SOUND CALIBRATION; IMPAIRED EARS; FREQUENCY; HEARING; HUMANS; VULNERABILITY; DEPENDENCE; AMPLITUDE

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