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Aging attenuated theta response during multistable perception.

Kurtuluş Mert Küçük1, Birgit Mathes2, Christina Schmiedt-Fehr3

  • 1Department of Psychology, Izmir University of Economics, Izmir, Turkey.

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|March 13, 2023
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Summary
This summary is machine-generated.

Older adults show slower perceptual reversals due to impaired frontal theta activity. This electrophysiological finding reveals age-related changes in how the brain integrates visual information, impacting cognitive function.

Keywords:
EEGagingevent-related oscillationsmultistable perceptiontheta oscillationstop-down processes

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Multistable stimuli cause spontaneous perceptual shifts, with reversal rates declining in older adults.
  • Electrophysiological evidence for age-related declines in perceptual reversal is lacking.
  • Theta activity is implicated in perceptual processing and integration.

Purpose of the Study:

  • To investigate age-related changes in theta activity associated with decreased perceptual reversal rates.
  • To explore the electrophysiological correlates of impaired multistable perception in older adults.

Main Methods:

  • Electroencephalography (EEG) recorded from young and older adults viewing stroboscopic alternative motion (SAM).
  • Time-frequency analysis of theta band (4-8 Hz) amplitudes using Morlet wavelet convolution.
  • Comparison of EEG data and perceptual performance (reversal rates, accuracy, reaction time) between age groups.

Main Results:

  • Older adults exhibited lower SAM reversal rates, decreased accuracy, and increased reaction time variability.
  • Diminished frontal theta response was observed in older adults during perceptual reversals.
  • Parietal theta remained intact, showing a robust correlation with reversal rates, unlike frontal theta.

Conclusions:

  • Impaired top-down facilitation of perceptual reversals in older adults contributes to a bottom-up resolution of multistability.
  • Age-related degradation in sensory areas may slow reversals by affecting bottom-up processing.
  • This study provides the first electrophysiological evidence for age-related impairments in multistable perceptual integration.