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Age-related differences in auditory evoked potentials as a function of task modulation during speech-nonspeech

Katharina Simone Rufener1, Franziskus Liem2, Martin Meyer3

  • 1Neuroplasticity and Learning in the Normal Aging Brain (HAB LAB), University of Zurich Zurich, Switzerland ; International Normal Aging and Plasticity Imaging Center (INAPIC), University of Zurich Zurich, Switzerland.

Brain and Behavior
|March 22, 2014
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Summary
This summary is machine-generated.

Older adults show distinct brain responses to speech and non-speech sounds, even when attention is focused. These auditory processing differences emerge earlier than behavioral changes, offering new insights into aging and auditory selective attention.

Keywords:
AgingEEGN1P2attentionspeech

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Processing

Background:

  • Aging impacts cognitive functions like memory and attention.
  • Language and speech processing are also affected by age, due to auditory system decline and cognitive changes.
  • Electrophysiological correlates of auditory selective attention in aging are not fully understood.

Purpose of the Study:

  • Investigate early electrophysiological markers of auditory selective attention in young and older adults using EEG.
  • Compare brain responses to speech and non-speech stimuli under varying attentional demands.

Main Methods:

  • Cross-sectional study design with young (20-32 years) and older (60-74 years) healthy adults.
  • Electroencephalography (EEG) to record brain activity.
  • Two tasks involving words/pseudowords as targets and white noise as distractors to modulate attention.

Main Results:

  • Behavioral accuracy was similar between age groups, regardless of attention modulation.
  • N1 and P2 auditory evoked potentials (AEPs) showed age-specific modulation based on attentional focus.
  • These modulations occurred for both speech and non-speech stimuli.

Conclusions:

  • Age-related differences in AEPs suggest distinct underlying neural processing.
  • These electrophysiological changes may reflect processing alterations not captured by behavioral measures.
  • Findings highlight the sensitivity of early auditory processing to aging and attention.