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J Am Acad Audiol 2000; 11(07): 383-389
DOI: 10.1055/s-0042-1748125
Original Article

Effect of Age on Interaural Asymmetry of Event-Related Potentials in a Dichotic Listening Task

James Jerger
School of Human Development, University of Texas at Dallas, Richardson, Texas
,
Deborah Moncrieff
currently Department of Communication Sciences and Disorders, University of Florida, Florida
,
Ralf Greenwald
School of Human Development, University of Texas at Dallas, Richardson, Texas
,
Ilse Wambacq
School of Human Development, University of Texas at Dallas, Richardson, Texas
,
Amanda Seipel
School of Human Development, University of Texas at Dallas, Richardson, Texas
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Abstract

Three groups of subjects, children, young adults, and elderly persons with presbyacusis, were tested in a directed attention, quasidichotic paradigm in which continuous speech was monitored for syntactically and/or semantically anomalous words. The task evoked an event-related potential (ERP) characterized by a positive peak in the latency region of 600 to 1000 msec. ERPs were separately averaged for target-word-right and target-word-left conditions. Amplitude and latency measures at the peak of the global field power waveform were calculated. Amplitude was significantly larger in children than in either adult group. In children and young adults, both amplitude and latency measures were equivalent for target-right and target-left conditions, but in elderly persons, latency was significantly greater in the target-left than in the target-right condition. Topographic maps of amplitude at the peak of the ERP waveform showed maximal positivity symmetrically distributed around the midline centroparietal area in both right-attended and left-attended conditions. In elderly persons, however, maximal positivity in the left-attended condition was significantly delayed relative to maximal positivity in the right-attended condition. Results are consistent with previous findings of interaural asymmetry in a dichotic listening task in elderly persons.

Abbreviations: ERP = event-related potential, GFP = global field power, VEOG = vertical electro-ocular activity

Key Words

Aging - dichotic - event-related potential - interaural asymmetry


Publication History

Article published online:
12 April 2022

© 2000. American Academy of Audiology. This article is published by Thieme.

Thieme Medical Publishers, Inc.
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