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Related Concept Videos

Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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:
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Olfaction01:25

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...

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Related Experiment Video

Updated: May 9, 2026

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity
06:13

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity

Published on: January 19, 2024

Narcolepsy and odor: preliminary report.

L Dominguez-Ortega1, E Díaz-Gállego, F Pozo

  • 1Unidad de Medicina de Familia y Unidad de Sueño Clínica Ruber, Instituto para la investigación de los trastornos del sueño (IITS), Madrid, Spain.

Semergen
|July 10, 2013
PubMed
Summary
This summary is machine-generated.

Trained dogs can detect a distinct odor in narcoleptic patients, suggesting personal smell could aid in narcolepsy diagnosis. This olfactory detection offers a potential new screening method for narcolepsy.

Keywords:
Adiestramiento caninoCanine scent detectionCompuestos orgánicos volátilesDetección olfativa caninaDistrofia miotónica tipo IDogs trainingElectronic noseHipersomniaHypersomniaMyotonic dystrophy type 1NarcolepsiaNarcolepsyNarices electrónicasPolisomnografíaPolysomnographyVolatile Organic Compounds

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Last Updated: May 9, 2026

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity
06:13

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity

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A Free-breathing fMRI Method to Study Human Olfactory Function
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A Free-breathing fMRI Method to Study Human Olfactory Function

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Olfactory Context Dependent Memory: Direct Presentation of Odorants
04:47

Olfactory Context Dependent Memory: Direct Presentation of Odorants

Published on: September 18, 2018

Area of Science:

  • Medical research
  • Olfactory detection
  • Sleep disorders

Background:

  • Narcolepsy diagnosis relies on clinical evaluation and sleep studies.
  • Identifying reliable biomarkers for narcolepsy is crucial for early detection.

Purpose of the Study:

  • To investigate if narcoleptic patients possess a unique body odor detectable by trained dogs.
  • To explore the potential of olfactory cues in diagnosing narcolepsy.

Main Methods:

  • Collected sweat samples from 12 narcoleptic patients and 22 healthy controls.
  • Two trained dogs independently assessed samples for odor detection without prior knowledge of the source.
  • Dog's detection results were compared against established narcolepsy diagnostic criteria.

Main Results:

  • Trained dogs correctly identified 11 out of 12 narcoleptic patients.
  • Dogs incorrectly identified 3 out of 22 healthy controls as positive.
  • A significant difference in odor detection was observed between narcoleptic patients and controls.

Conclusions:

  • Narcoleptic patients exhibit a characteristic odor detectable by trained canines.
  • Olfactory testing using trained dogs shows promise as a novel screening tool for narcolepsy.
  • This research opens avenues for developing objective, non-invasive diagnostic methods for narcolepsy.