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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:
Sleep Apnea01:21

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
Teeth01:15

Teeth

The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
Nonconscious Mimicry01:13

Nonconscious Mimicry

Nonconscious mimicry occurs when individuals alter their mannerisms to match the behaviors and expressions of those nearby, without intention.
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...
Mechanism of Breathing II: Expiration01:23

Mechanism of Breathing II: Expiration

The Physiology of Expiration: A Seamless Respiratory Process
Expiration, or exhaling, is a complex physiological process that begins as the inspiratory muscles begin to relax. This relaxation triggers a series of events that epitomize the efficiency of the respiratory system.
Mechanism of Expiration:

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Related Experiment Video

Updated: Jun 14, 2026

A Laboratory Method to Measure Contagious Yawning in Rats
06:49

A Laboratory Method to Measure Contagious Yawning in Rats

Published on: June 14, 2019

Yawning throughout life.

F Giganti, P Salzarulo

    Frontiers of Neurology and Neuroscience
    |April 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Yawning frequency changes throughout life, decreasing in preterm infants and the elderly, but increasing in school-aged children. This behavior appears to regulate arousal across all life stages.

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    Published on: April 28, 2020

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Behavioral Science

    Background:

    • Yawning is an innate behavior observed from fetal development through infancy, childhood, and into old age.
    • Yawning patterns exhibit significant variations across the human lifespan, differing from fetal stages to adulthood and old age.

    Purpose of the Study:

    • To investigate the developmental trajectory of yawning frequency across the human lifespan.
    • To explore the relationship between yawning and arousal states at different life stages.

    Main Methods:

    • Observational studies tracking yawning frequency in fetuses, preterm infants, children, adults, and the elderly.
    • Correlation analysis of yawning patterns with sleepiness and arousal levels.

    Main Results:

    • Yawning frequency decreases in preterm infants (31-40 weeks postconceptional age) and the elderly, while increasing in school-aged children.
    • Adult yawning frequency correlates with sleepiness, except upon waking. Diurnal variations in yawning are absent in fetuses and preterm infants but present in adults.
    • Yawning is linked to arousal modulation, often preceding motor activation in preterm infants and occurring during sleep transitions in adults.

    Conclusions:

    • Yawning serves as a crucial mechanism for arousal regulation throughout the lifespan, with its frequency and patterns evolving significantly from prenatal development to old age.
    • Understanding the developmental changes in yawning provides insights into neurodevelopmental processes and arousal modulation strategies.