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Related Experiment Video

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Alpha phase dynamics predict age-related visual working memory decline.

Tam T Tran1, Nicole C Hoffner1, Sara C LaHue2

  • 1Neurosciences Graduate Program, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, United States.

Neuroimage
|September 1, 2016
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Older adults show poorer working memory due to less consistent alpha brainwave activity. Changes in alpha phase dynamics may contribute to age-related cognitive decline.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Alpha oscillations (7-14Hz) are known to respond to visual cues.
  • The neural response to alerting cues and its modulation by aging is less understood.

Purpose of the Study:

  • To investigate how visual cortical alpha activity relates to working memory performance in younger and older adults.
  • To explore the impact of healthy aging on the neural response to alerting cues.

Main Methods:

  • Scalp electroencephalography (EEG) was used to measure brain activity.
  • Participants (younger: 20-30 years; older: 60-70 years) performed a working memory task with visual alerting cues.

Main Results:

  • Older adults exhibited slower response times and reduced accuracy at high memory loads.
  • Older adults demonstrated less consistent cue-evoked alpha phase resetting compared to younger adults.
  • Alpha phase prior to stimulus presentation predicted response time, but this relationship was weaker in older adults.

Conclusions:

  • Reduced consistency in alpha phase dynamics, particularly before stimulus presentation, may underlie age-related working memory deficits.
  • Changes in alpha phase resetting are a potential neural mechanism contributing to cognitive decline in healthy aging.