Document Detail

Distortion product otoacoustic emissions: comparison of sequential versus simultaneous presentation of primary-tone pairs.
MedLine Citation:
PMID:  14708836     Owner:  NLM     Status:  MEDLINE    
This Grason-Stadler GSI-60 system for measuring distortion product otoacoustic emissions (DPOAEs) allows the examiner to present one set of primary-tone pairs at a time (i.e., sequential presentation), or to present as many as four sets of primary-tone pairs at a time (i.e., simultaneous presentation). The Sequential and Simultaneous protocols were used to compare administration times, DPOAEs, and noise floors (NFs) on normal-hearing subjects at three frequencies (f2 = 1000, 2000, and 4000 Hz) and eight intensities (L1 = 40-75 dB SPL in 5 dB steps; L2 = 30-65 dB SPL). The Simultaneous protocol was completed in less than half the time (mean = 2 minutes, 21 seconds) required for the Sequential protocol (mean = 5 minutes, 13 seconds). When stimulus intensity (L1) was <60 dB SPL, the Sequential and Simultaneous protocols yielded similar DPOAEs and NFs. However, at the higher L1 intensities, the NFs for the Simultaneous protocol were larger than those for the Sequential protocol. The higher Simultaneous NFs reflect the greater system distortion/noise generated by the GSI-60 instrumentation. Reliability was assessed using the standard error of measurement of the difference between two scores. The data revealed no significant differences between protocols, and suggest that differences between two DPOAEs are statistically significant if they exceed approximately 7 dB (95% confidence interval).
Randall C Beattie
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the American Academy of Audiology     Volume:  14     ISSN:  1050-0545     ISO Abbreviation:  J Am Acad Audiol     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2004-01-07     Completed Date:  2004-04-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9114646     Medline TA:  J Am Acad Audiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  471-84     Citation Subset:  IM    
Department of Communicative Disorders, California State University, Long Beach, CA 90840, USA.
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MeSH Terms
Acoustic Stimulation / instrumentation*
Analysis of Variance
Otoacoustic Emissions, Spontaneous / physiology*
Pitch Perception / physiology*
Reproducibility of Results
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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