Document Detail

A study of logon-evoked middle latency responses in female subjects with normal hearing.
MedLine Citation:
PMID:  17684650     Owner:  NLM     Status:  MEDLINE    
The middle latency response (MLR) to an acoustic stimulus occurs between 10 and 80 ms. The waveform is characterized by a series of peaks and troughs labeled N0, P0, Na, Pa, Nb and Pb. Certain acoustic stimuli may excite specific cochlear areas in contrast with clicks, that activate the cochlea between 1000 and 4000 Hz. The logon stimulus activates segmentar areas of the cochlea and has advantages over clicks when assessing low frequency areas of the cochlea (below 1 kHz). AIM: The aim of this paper was to study the MLR electrophysiologic response when activated by logon stimuli at 500, 1000 and 2000 Hz. METHOD- a prospective and descriptive study. 14 female volunteers had normal otology and conventional audiology results. The stimulus was monoaural and ipsilateral (Cz/A1-2). RESULTS: the NaPa complex was readily identified compared to other complexes and was present in 100% of the tests done at 2000 Hz, and in 96.4% of the tests done at 500 and 1000 Hz. CONCLUSION: the logon stimulus at 500, 1000 and 2000 Hz elicits MLRs; the NaPa complex was the most frequent event and the 2000 Hz frequency elicited more responses than other frequencies.
Erika Maria Fukushima; Ney Penteado de Castro
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Brazilian journal of otorhinolaryngology     Volume:  73     ISSN:  1808-8694     ISO Abbreviation:  -     Publication Date:    2007 May-Jun
Date Detail:
Created Date:  2007-08-08     Completed Date:  2007-12-20     Revised Date:  2008-10-06    
Medline Journal Info:
Nlm Unique ID:  101207337     Medline TA:  Braz J Otorhinolaryngol     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  308-14     Citation Subset:  IM    
Santa Casa Medical School, Sao Paulo.
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MeSH Terms
Acoustic Stimulation
Audiometry, Evoked Response
Auditory Perception / physiology*
Evoked Potentials, Auditory*
Prospective Studies
Reaction Time / physiology*
Reference Values

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