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Dynamic functional connectivity and its behavioral correlates beyond vigilance.

Amiya Patanaik1, Jesisca Tandi1, Ju Lynn Ong1

  • 1Center for Cognitive Neuroscience, Neuroscience and Behavioral Disorders Program, Duke-NUS Medical School, National University of Singapore, Singapore.

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|April 29, 2018
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Summary
This summary is machine-generated.

Dynamic functional connectivity states (DCS) predict vigilance changes in adolescents, especially after sleep restriction. This brain activity pattern reveals individual differences in cognitive vulnerability to sleep loss.

Keywords:
Dynamic functional connectivity (fMRI)Global signalSleep deprivationSpeed of processingVigilanceWorking memory

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Cognitive Psychology

Background:

  • Resting-state functional connectivity and global signal fluctuations correlate with vigilance.
  • Associations with other behavioral measures remain unclear.

Purpose of the Study:

  • To investigate the relationship between dynamic functional connectivity states (DCS) and behavioral measures in adolescents.
  • To assess how sleep restriction impacts these relationships and unmasks cognitive vulnerabilities.

Main Methods:

  • 52 healthy adolescents underwent resting-state fMRI scans after adequate sleep and subsequent sleep restriction.
  • Sliding window analysis identified two distinct DCS ('low arousal' and 'high arousal').
  • Participants were grouped based on the temporal predominance of these DCS.

Main Results:

  • The relative time spent in DCS predicted group differences in vigilance at baseline and its decline after sleep restriction.
  • DCS predicted cognitive vulnerabilities in processing speed and working memory following sleep restriction, but not at baseline.
  • DCS temporal predominance did not predict mood or sleepiness, indicating specific behavioral predictions.

Conclusions:

  • Dynamic functional connectivity states are sensitive to vigilance and cognitive performance changes induced by sleep restriction.
  • DCS may serve as a biomarker for predicting individual susceptibility to sleep-related cognitive deficits.
  • Global signal fluctuations are linked to vigilance and potentially head motion during low arousal states.