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Age-related decrease in cortical excitability circadian variations during sleep loss and its links with cognition.

Giulia Gaggioni1, Julien Q M Ly2, Vincenzo Muto1

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Neurobiology of Aging
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Summary
This summary is machine-generated.

Cortical excitability dynamics are dampened in older adults during sleep deprivation, mitigating cognitive decline. This suggests reduced brain adaptability may underlie aging-related cognitive changes.

Keywords:
AgingCircadianCognitionCortical excitabilitySleep

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Area of Science:

  • Neuroscience
  • Cognitive Aging
  • Sleep Research

Background:

  • Cortical excitability is crucial for cognition and affected by sleep-wake cycles.
  • Age-related cognitive decline is linked to altered cortical excitability.
  • The impact of prolonged wakefulness on cortical excitability in aging is not well understood.

Purpose of the Study:

  • To investigate age-related differences in cortical excitability dynamics during extended wakefulness.
  • To explore the association between these dynamics and the neurobehavioral effects of sleep loss on executive functions.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) and electroencephalography (EEG) to repeatedly assess frontal cortical excitability.
  • Recruited 13 young and 12 older healthy participants undergoing sleep deprivation.

Main Results:

  • No significant difference in overall cortical excitability between age groups.
  • Older adults exhibited dampened variations in cortical excitability during prolonged wakefulness.
  • This dampening correlated with reduced negative impacts of sleep loss on executive functions.

Conclusions:

  • Reduced cortical excitability dynamics in older adults may stem from diminished sleep homeostasis and circadian influences.
  • This suggests decreased brain adaptability and cognitive flexibility in aging.
  • Further research is needed to confirm behavioral associations and explore interventions to maintain cortical excitability dynamics.