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Related Concept Videos

Olfaction01:25

Olfaction

46.2K
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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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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...
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Related Experiment Video

Updated: Oct 20, 2025

Sampling and Analysis of Animal Scent Signals
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Sampling and Analysis of Animal Scent Signals

Published on: February 13, 2021

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Olfaction: Source separation in a single sniff.

Joshua Harvey1, Dmitry Rinberg2

  • 1Neuroscience Institute, NYU Langone Health, New York, NY 10016, USA.

Current Biology : CB
|September 14, 2021
PubMed
Summary
This summary is machine-generated.

Mammalian olfaction is faster than previously believed. Mice can distinguish rapid scent changes up to 40 Hz, suggesting high-bandwidth olfactory processing capabilities in mammals.

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Olfactory Research

Background:

  • Mammalian olfaction is crucial for survival and behavior.
  • Previous understanding suggested slower olfactory processing speeds.
  • The mechanisms enabling rapid scent discrimination remain largely unknown.

Purpose of the Study:

  • To investigate the temporal resolution limits of mammalian olfaction.
  • To explore the potential for high-bandwidth olfactory processing in mammals.
  • To understand the neural basis of rapid scent discrimination.

Main Methods:

  • Behavioral experiments with mice to test olfactory discrimination.
  • Stimuli designed to probe fine temporal structures in scent.
  • Analysis of discrimination thresholds at various frequencies.

Main Results:

  • Mice demonstrated the ability to discriminate olfactory stimuli with fine temporal differences.
  • Discrimination was successful at frequencies up to 40 Hertz (Hz).
  • This indicates a higher temporal processing capacity than previously assumed.

Conclusions:

  • Mammalian olfaction operates at significantly higher bandwidths than previously thought.
  • The findings challenge existing models of olfactory processing speed.
  • Further research is needed to elucidate the neural mechanisms underlying this rapid olfactory capability.