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Related Experiment Videos

Aging affects hemispheric asymmetry on a competing speech task.

R R Greenwald1, J Jerger

  • 1Program in Applied Cognition and Neuroscience, School of Human Development, University of Texas at Dallas, USA.

Journal of the American Academy of Audiology
|May 3, 2001
PubMed
Summary

Aging impacts how the brain processes language, altering hemispheric asymmetry in event-related potentials (ERPs). This study reveals age-related shifts in brain wave patterns during speech comprehension.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Hemispheric asymmetry in language processing is well-documented.
  • Event-related potentials (ERPs) offer insights into the timing of cognitive processes.
  • The effects of aging on these neural dynamics are not fully understood.

Purpose of the Study:

  • To investigate how aging affects hemispheric asymmetry of ERPs during morphosyntactic anomaly detection in competing speech.
  • To compare ERP patterns across different age groups: children, young adults, and elderly individuals.

Main Methods:

  • Participants (children, young adults, elderly) listened to a narrative with embedded anomalous words.
  • Event-related potentials (ERPs) were recorded from 32 scalp sites.
  • Hemispheric asymmetry of positivity was analyzed in specific latency ranges.

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Main Results:

  • Anomalous words elicited a positivity in the 700-900 msec range across all age groups.
  • Children and young adults showed left-hemisphere dominance for asymmetry.
  • Elderly individuals exhibited delayed asymmetry (peaking at 1100 msec) with differing hemispheric preferences based on target location.

Conclusions:

  • Aging significantly alters hemispheric asymmetry in linguistic processing.
  • Neural patterns of speech comprehension change with age, affecting interhemispheric communication.