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Increased Functional Brain Network Efficiency During Audiovisual Temporal Asynchrony Integration Task in Aging.

Bin Wang1,2, Peizhen Li1, Dandan Li1

  • 1College of Computer Science and Technology, Taiyuan University of Technology, Taiyuan, China.

Frontiers in Aging Neuroscience
|October 26, 2018
PubMed
Summary
This summary is machine-generated.

Older adults show increased brain network efficiency during audiovisual integration tasks, suggesting potential difficulties with attention and cognitive control compared to younger adults. This highlights age-related differences in processing synchronized and unsynchronized sensory information.

Keywords:
EEGagingaudiovisual integrationfunctional connectivitytheta and alpha bands

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Gerontology

Background:

  • Audiovisual integration is crucial for perception and changes across the lifespan.
  • Age-related differences in functional connectivity during audiovisual temporal asynchrony tasks are not well understood.

Purpose of the Study:

  • To investigate age-related changes in functional connectivity during audiovisual temporal asynchrony integration.
  • To compare brain network dynamics between young and old adults in response to audiovisual stimuli.

Main Methods:

  • Electroencephalograms (EEGs) were recorded from young and old adults during an audiovisual temporal asynchrony integration task.
  • Phase lag index (PLI)-weighted functional connectivity networks were analyzed in theta and alpha frequency bands.

Main Results:

  • Audiovisual integration tasks dynamically modulated functional connectivity networks.
  • Younger adults showed stronger integration effects in AV and V50A conditions.
  • Older adults exhibited higher global and local network efficiencies and degree in theta and alpha bands, indicating increased cognitive demand.

Conclusions:

  • Older adults' higher network efficiencies suggest potential challenges in attention and cognitive control during audiovisual tasks with temporal asynchrony.
  • Network efficiencies were associated with integration timing only in young adults.
  • Findings offer insights into the network topography of older adults during audiovisual integration, emphasizing increased connectivity and efficiency under cognitive load.