Korean Journal of Audiology (대한청각학회지)

The Korean Audiology Society (대한청각학회)
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Lateralization of the Dichotic Digits Test, Central Auditory Processes, and Evoked Potentials in Multiple Sclerosis

  • Penaloza, Yolanda (Laboratory of Central Auditory Processing Alterations Research, National Institute of Rehabilitation) ;
  • Valdivia, Martha (Department of Otoneurology, National Institute of Rehabilitation) ;
  • Poblano, Adrian (Laboratory of Cognitive Neurophysiology, National Institute of Rehabilitation)
  • Received : 2019.04.18
  • Accepted : 2019.08.29
  • Published : 2020.01.20
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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

Acknowledgement

Thanks to Teodoro Flores (MD), Blanca Flores (MD), and Sonia Borja (MD) from the Electrophysiology Department for their help in finding the recordings and their interpretation of neurophysiological studies of the case report. We must also thank the Departments of Audiology, Otoneurology, Phoniatrics, and Neurological Rehabilitation of the INR which provided us their evaluations and orientations regarding clinical, therapeutic, and rehabilitation findings.

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