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Related Concept Videos

Olfaction01:25

Olfaction

46.5K
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...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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...
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Related Experiment Video

Updated: Nov 6, 2025

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Deconstructing the mouse olfactory percept through an ethological atlas.

Diogo Manoel1, Melanie Makhlouf1, Charles J Arayata2

  • 1Sidra Medicine, PO Box 26999, Doha, Qatar.

Current Biology : CB
|May 6, 2021
PubMed
Summary

Researchers mapped mouse olfactory behavior, revealing diverse responses to odors and concentrations. Mouse odor perception shares fundamental properties with humans, aiding comparative studies.

Keywords:
behaviorchemoinformaticsmachine learningodorolfactoryperception

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Area of Science:

  • Neuroscience
  • Ethology
  • Sensory Biology

Background:

  • Odor perception in non-human animals remains largely unexplored.
  • Understanding animal olfaction is crucial for comparative sensory science.

Purpose of the Study:

  • To create a comprehensive olfactory ethological atlas for mice.
  • To investigate the relationship between odorant properties, concentration, and behavioral responses.
  • To compare mouse olfactory perception with human perception.

Main Methods:

  • Collected behavioral data from mice exposed to 73 diverse odorants at various concentrations.
  • Utilized machine learning to predict odorant identity based on observed behaviors.
  • Analyzed correlations between odorant physicochemical properties, concentration, and behavioral outcomes.

Main Results:

  • Mouse olfactory behavior is highly diverse and significantly influenced by odorant identity and concentration.
  • Behavioral data from other mice predicted the presented odorant with 82% accuracy (two-odorant choice).
  • Unique odorant identification from behavior was achieved 20% on the first try and 46% within five attempts.
  • Mouse and human olfactory perception share key properties: valence, physicochemical influence, and concentration effects.

Conclusions:

  • The mouse olfactory ethological atlas provides a foundational resource for understanding rodent olfaction.
  • Mouse olfactory perception, while distinct, shares fundamental organizational principles with human perception.
  • This study establishes a framework for future cross-species comparative olfactory research.