Document Detail

Effects of click rate and electrode orientation on threshold of the auditory brainstem response.
MedLine Citation:
PMID:  2601318     Owner:  NLM     Status:  MEDLINE    
This study evaluated the effects of stimulus presentation rate and electrode orientation on ABR threshold. Six normal-hearing adults served as subjects. ABRs were recorded from three orthogonal electrode pairs in response to click stimuli at rates of 48 and 21/s. Psychophysical thresholds were determined for each of these stimuli, and ABRs were recorded with stimuli between 0 and 10 dB SL in 2-dB steps. A ratio of ABR signal strength to noise variance (Fsp) was the criterion used to define threshold. Specifically, an Fsp value of 2.25, equivalent to a 95% response confidence using 5 and 250 degrees of freedom, was the criterion used to determine response presence within a maximum of 10,000 sweeps per average. Results revealed that, for normal-hearing adult subjects, click rate up to 48/s does not influence the sensation level at which a detectable response can be found, and a nearly vertical electrode orientation is optimal for recording the response at low levels. The predicted difference between psychophysical and ABR thresholds with a vertical electrode orientation, using 10,000 sweeps per average, up to 48 clicks per second, and an Fsp criterion of 2.25 is 4.4 dB.
Y S Sininger; M Don
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of speech and hearing research     Volume:  32     ISSN:  0022-4685     ISO Abbreviation:  J Speech Hear Res     Publication Date:  1989 Dec 
Date Detail:
Created Date:  1990-01-30     Completed Date:  1990-01-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376336     Medline TA:  J Speech Hear Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  880-6     Citation Subset:  IM    
Electrophysiology Lab, House Ear Institute, Los Angeles, CA 90057.
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MeSH Terms
Auditory Threshold
Brain Stem*
Differential Threshold
Evoked Potentials, Auditory*

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

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