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J Audiol Otol > Epub ahead of print
DOI: https://doi.org/10.7874/jao.2019.00150    [Epub ahead of print] Published online November 4, 2019.
Lateralization of the Dichotic Digits Test, Central Auditory Processes, and Evoked Potentials in Multiple Sclerosis
Yolanda Peñaloza1,2  , Martha Valdivia3  , Adrián Poblano4 
1Laboratory of Central Auditory Processing Alterations Research, National Institute of Rehabilitation, Mexico City, México
2Postgraduate area, School of Medicine, The National Autonomous University of Mexico, Mexico City, México
3Department of Otoneurology, National Institute of Rehabilitation, Mexico City, México
4Laboratory of Cognitive Neurophysiology, National Institute of Rehabilitation, Mexico City, México
Correspondence  Yolanda Peñaloza ,Tel: +52-55-5489-6599, Fax: +52-55-5489-6599, Email: yrpenaloza@inr.gob.mx
Submitted: April 18, 2019  Accepted after revision: August 29, 2019
Abstract
Lateralization for central auditory processing (CAP) with dichotic digits recognition (DDR) test is believed expression of hemispheric dominance. Multiple sclerosis (MS) is considered an inflammatory and autoimmune alteration of central nervous system (CNS). Hearing alterations in MS and their role in CAP has not been well studied. A patient with MS and new kind of alteration in lateralization of CAP with DDR test is presented. A 53 year of age female with MS of 16 years of evolution, nine of them remained asymptomatic. She has a persistent advantage of the right ear for DDR test; but other monaural tests showed predominance of the left afferent pathway. Brainstem auditory evoked potentials (BAEPs) and long latency auditory evoked potentials (LLAEPs) showed adequate right response with deficits in organization of left response in BAEP, and N2 wave. In the contrary direction of previous publication, we disclosed advantage for DDR test, BAEP, and LLAEP in the right ear. We observed no left ear suppression; with predominance of correct left percentages in monaural psychoacoustics tests. We must keep on searching to find pathophysiological meaning of predominant of right or left auditory laterality as a CAP disorder in patients with MS.
Keywords: Central auditory processing disorder · Dichotic listening tests · Brainstem auditory evoked potentials · Evoked potentials · Multiple sclerosis


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