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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Brain Waves01:23

Brain Waves

Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...

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Related Experiment Video

Updated: May 15, 2026

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
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Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo

Published on: March 31, 2016

Local experience-dependent changes in the wake EEG after prolonged wakefulness.

Ching-Sui Hung1, Simone Sarasso, Fabio Ferrarelli

  • 1Department of Psychiatry, University of Wisconsin, Madison, Madison, WI 53719, USA.

Sleep
|January 5, 2013
PubMed
Summary

Prolonged wakefulness increases sleep pressure, leading to local theta waves in specific brain regions. This experience-dependent plasticity enhances subsequent sleep intensity in those same areas.

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

Related Experiment Videos

Last Updated: May 15, 2026

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
10:19

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo

Published on: March 31, 2016

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
08:58

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

Area of Science:

  • Neuroscience
  • Sleep Research
  • Cognitive Neuroscience

Background:

  • Prolonged wakefulness elevates sleep pressure, globally increasing slow wave activity (SWA) and theta activity in sleep electroencephalogram (EEG).
  • Rodent studies reveal 'local sleep' phenomena during wakefulness, characterized by slow/theta waves in specific cortical areas.
  • Experience-dependent plasticity is increasingly recognized as a local regulator of sleep.

Purpose of the Study:

  • To investigate if extended practice of specific tasks increases local intermittent theta waves in human EEG.
  • To determine if these local EEG changes exceed global changes associated with prolonged wakefulness.
  • To explore the relationship between task-specific brain circuit activation and local sleep phenomena.

Main Methods:

  • 16 healthy participants underwent high-density EEG recordings during two experiments involving prolonged wakefulness (≥24 hours).
  • Participants engaged in a language task (audiobook listening) and a visuomotor task (driving simulator).
  • EEG data were analyzed for global and regional changes in theta power and SWA during wakefulness.

Main Results:

  • Both tasks induced global increases in resting wake EEG theta power and sleepiness after 24 hours of wakefulness.
  • Task-specific, regional increases in wake theta power were observed: left frontal for language, posterior parietal for driving.
  • Local wake theta power changes correlated with concurrent local increases in sleep low frequencies, including SWA.

Conclusions:

  • Extended, experience-dependent plasticity in specific brain circuits leads to localized increases in wake theta EEG power.
  • These localized EEG changes during wakefulness are followed by intensified sleep, specifically SWA, in the same brain regions.
  • This suggests a local regulation of sleep intensity tied to prior neural activity and plasticity.