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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
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...
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:
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...
Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Understanding Sleep01:11

Understanding Sleep

Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...

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Related Experiment Video

Updated: May 17, 2026

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
06:23

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

Published on: September 22, 2020

Inhibitory Decay and Supercritical Brain Dynamics During Sleep Deprivation.

Dai Zhang1,2, Liqin Zhou3, Rong Wang1,2

  • 1Department of Radiology, The Second Affiliated Hospital of Anhui Medical University, Hefei, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 15, 2026
PubMed
Summary

Sleep deprivation (SD) causes brain networks to become unstable, shifting from near-critical to supercritical states. This instability is linked to reduced inhibitory control, impacting brain-wide dynamics.

Keywords:
criticalityexcitation–inhibition balanceinhibitory efficacyneuronal avalanchesresting‐state fMRIsleep deprivation

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Related Experiment Videos

Last Updated: May 17, 2026

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
06:23

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

Published on: September 22, 2020

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

Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • Sleep deprivation (SD) alters brain dynamics, but the underlying circuit mechanisms are not fully understood.
  • Understanding how brain networks transition during extended wakefulness is crucial for cognitive health.

Purpose of the Study:

  • To investigate the circuit-level changes in brain dynamics during 36 hours of continuous wakefulness.
  • To identify the specific neural mechanisms driving large-scale propagation instability caused by sleep deprivation.

Main Methods:

  • Utilized resting-state functional Magnetic Resonance Imaging (rs-fMRI) BOLD signals from 26 participants scanned across seven time points over 36 hours.
  • Applied neuronal avalanche metrics (branching ratio, mean avalanche size) to assess brain criticality.
  • Employed a recurrent excitatory-inhibitory network model to simulate and interpret findings.

Main Results:

  • A progressive shift from near-critical to supercritical brain propagation was observed, indicated by an increasing branching ratio.
  • This shift was network-heterogeneous, with visual and sensorimotor networks deviating most, while the limbic network remained near-critical.
  • Changes in criticality correlated with subjective sleep pressure but not vigilance lapses.
  • Functional connectivity analysis revealed a shift toward more high-degree nodes.

Conclusions:

  • Inhibitory decay is a plausible circuit-level mechanism driving large-scale propagation instability during sleep deprivation.
  • The findings suggest that reduced inhibitory efficacy can explain the observed shift towards supercriticality and network resilience patterns.
  • This research provides a mechanistic link between sleep deprivation, brain network instability, and potential cognitive consequences.