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Aging-related changes of EEG synchronization during a visual working memory task.

Chaolin Teng1, Yao Cheng1, Chao Wang1

  • 11The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Institute of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049 Shaanxi Province People's Republic of China.

Cognitive Neurodynamics
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Older adults show reduced brainwave synchronization during working memory tasks, impacting performance. This decline in EEG synchronization may contribute to age-related working memory capacity loss.

Keywords:
AgingEEGSynchronizationWorking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Aging Research

Background:

  • Working memory (WM) capacity declines with healthy aging.
  • Understanding the neural mechanisms underlying this decline is crucial.
  • Electroencephalography (EEG) measures brain electrical activity, offering insights into cognitive processes.

Purpose of the Study:

  • To investigate differences in EEG synchronization between young and older adults during a working memory task.
  • To evaluate the utility of Synchronization Likelihood (SL) for assessing EEG synchronization in aging.

Main Methods:

  • Recorded EEG signals from 14 young and 12 older adults in resting and task states.
  • Calculated Synchronization Likelihood (SL) across 19 electrodes and delta, theta, alpha1, alpha2, and beta frequency bands.
  • Compared SL values between age groups during a working memory task.

Main Results:

  • Older adults exhibited significantly decreased EEG synchronization in alpha1, alpha2, and beta bands during the WM task.
  • Reduced EEG synchronization in the beta band was also observed in older adults during the resting state.
  • Poorer task performance correlated with decreased EEG synchronization in the older group.

Conclusions:

  • Reduced EEG synchronization, particularly in higher frequency bands, is associated with working memory decline in healthy aging.
  • Synchronization Likelihood (SL) is a viable method for assessing age-related changes in brain activity.
  • Decreased neural synchronization may be a contributing factor to age-associated working memory impairments.