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Updated: Sep 24, 2025

Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
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Sleep-Specific Processing of Auditory Stimuli Is Reflected by Alpha and Sigma Oscillations.

Malgorzata Wislowska1,2, Wolfgang Klimesch1, Ole Jensen3

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The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 4, 2022
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The sleeping brain processes auditory information, with theta oscillations showing vigilance-independent responses and alpha/sigma oscillations indicating sleep-specific processing. This reveals how sensory information is handled during different sleep stages.

Keywords:
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Area of Science:

  • Neuroscience
  • Sleep Research
  • Cognitive Science

Background:

  • Cognitive functions are increasingly found to be preserved during sleep.
  • Understanding the mechanisms of these preserved functions, especially sensory processing, is a key challenge.
  • Neural processing during sleep remains less understood compared to wakefulness.

Purpose of the Study:

  • To investigate dynamic changes in brain oscillations and connectivity during non-REM sleep in response to auditory stimuli.
  • To differentiate neural processing of environmental stimuli across the wake-sleep spectrum.
  • To explore the functional roles of theta (θ), alpha (α), and sigma (σ) oscillations during sleep.

Main Methods:

  • Simultaneous electroencephalography (EEG) and magnetoencephalography (MEG) recordings.
  • Analysis of brain oscillations and connectivity patterns in response to aurally presented names.
  • Comparison of neural responses across different vigilance states, including non-REM sleep.

Main Results:

  • Aurally presented names were processed and neuronally differentiated during sleep.
  • Two distinct oscillatory power increases were observed: vigilance state-independent θ synchronization post-stimulus onset.
  • Sleep-specific α/σ synchronization occurred post-stimulus offset, sensitive to information saliency and sleep stage.

Conclusions:

  • The sleeping brain exhibits distinct neural mechanisms for sensory processing compared to wakefulness.
  • Theta oscillations are involved in early stimulus processing, while alpha and sigma oscillations reflect later, sleep-stage-dependent processing.
  • These findings suggest a reorganization of sensory processing mechanisms during sleep initiation.