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Related Concept Videos

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Nightmares and Night Terrors

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Nightmares and night terrors represent two distinct types of sleep disturbances that differ in timing, characteristics, and the sleeper's recall of the event. Nightmares are vivid, disturbing dreams that usually awaken the sleeper from REM sleep, a stage of sleep where brain activity is high, and dreams are most frequent. Upon awakening, individuals often have detailed recollections of their nightmares, which can include themes of threats to survival, security, or self-esteem.
Nightmares...
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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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.
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Lucid dreaming is a unique state of consciousness where an individual realizes they are dreaming while still in the dream. This awareness allows them to manipulate their dream environment consciously. Researchers like Stephen LaBerge have significantly contributed to the understanding of lucid dreams, highlighting that during these dreams, certain areas of the brain, such as the prefrontal cortex, that involve self-awareness and thought evaluation show increased activity.
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Restless Leg Syndrome (RLS), also known as Willis-Ekbom disease, is a neurological disorder characterized by an uncontrollable urge to move the legs due to uncomfortable sensations. These sensations typically occur during periods of rest or inactivity, particularly when lying down or sitting, and can severely disrupt sleep.
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Related Experiment Video

Updated: Jun 25, 2025

Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats
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Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats

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REM sleep: Out-dreaming fear.

Brittany J Dugan1, Jimmy J Fraigne1, John Peever1

  • 1Department of Cell and Systems Biology, University of Toronto, Toronto ON, Canada.

Current Biology : CB
|May 21, 2024
PubMed
Summary

Forgetting fear is crucial for adaptation, but how it works in the brain is unknown. New research shows the infralimbic cortex, especially during REM sleep, helps extinguish fear memories.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Science

Background:

  • Fear memory extinction is vital for adapting to changing environments.
  • The precise neural pathways governing the forgetting of fear remain largely uncharacterized.
  • Understanding fear forgetting mechanisms is critical for developing treatments for fear-related disorders.

Purpose of the Study:

  • To elucidate the neural underpinnings of fear memory extinction.
  • To investigate the role of specific brain regions and sleep states in the forgetting of fear.

Main Methods:

  • Utilized advanced neuroimaging and electrophysiological techniques in animal models.
  • Monitored neural activity in the infralimbic cortex during various behavioral tasks and sleep stages.
  • Correlated infralimbic cortex activity patterns during REM sleep with fear memory recall and extinction.

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Related Experiment Videos

Last Updated: Jun 25, 2025

Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats
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Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats

Published on: August 22, 2020

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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12:51

Investigating the Neural Mechanisms of Aware and Unaware Fear Memory with fMRI

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Main Results:

  • Identified a significant contribution of infralimbic cortex activity to the extinction of fear memories.
  • Demonstrated that this contribution is particularly pronounced during Rapid Eye Movement (REM) sleep.
  • Established a direct link between specific neural firing patterns in the infralimbic cortex during REM sleep and the successful forgetting of fear.

Conclusions:

  • Infralimbic cortex activity during REM sleep is a key mechanism for fear memory extinction.
  • This finding sheds light on the neurobiology of forgetting and adaptation.
  • Offers potential therapeutic targets for conditions involving impaired fear extinction, such as PTSD.