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Related Concept Videos

Olfaction01:25

Olfaction

45.8K
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: Oct 14, 2025

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

Olfactory Context Dependent Memory: Direct Presentation of Odorants

Published on: September 18, 2018

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Time Course of Odor Categorization Processing.

Jisub Bae1, Kwangsu Kim2, Sun Ae Moon2

  • 1Brain Engineering Convergence Research Center, Daegu Gyeungbuk Institute of Science and Technology (DGIST), Daegu, South Korea.

Cerebral Cortex Communications
|November 8, 2021
PubMed
Summary
This summary is machine-generated.

This study reveals how the brain processes odors within milliseconds. Specific brainwave patterns (theta and gamma frequencies) at distinct times correlate with how we perceive smell quality.

Keywords:
EEGgammaodor categorizingodor qualityolfactory processingolfactory systemthetatime course

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Area of Science:

  • Neuroscience
  • Olfactory Processing
  • Sensory Perception

Background:

  • Odor categorization involves complex neurological processes with temporal and spatial activation.
  • Limited human data exists on millisecond-level odor processing and its temporal mechanisms.
  • Understanding temporal dynamics is crucial as different brain areas activate at specific times during sensory input.

Purpose of the Study:

  • To investigate how the human brain categorizes odors at specific time intervals.
  • To identify temporal patterns in neural activity related to odor perception.

Main Methods:

  • Utilized multivariate electroencephalography (EEG) analysis.
  • Focused on analyzing neural signals within specific millisecond time windows and frequency bands (theta and gamma).

Main Results:

  • Similarly perceived odors elicited comparable EEG signals at theta frequency (50-100, 150-200, 350-400 ms).
  • Significant neural activation occurred at gamma frequency (100-150, 350-400 ms).
  • Olfactory-associated brain regions, including the orbitofrontal cortex, showed activation at these frequencies and times.

Conclusions:

  • Specific temporal intervals in neural activity are linked to odor quality processing.
  • Findings support the role of distinct time windows and brainwave frequencies in central olfactory processing.