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Related Concept Videos

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...

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Related Experiment Video

Updated: Jul 6, 2026

Olfactory Behaviors Assayed by Computer Tracking Of Drosophila in a Four-quadrant Olfactometer
08:52

Olfactory Behaviors Assayed by Computer Tracking Of Drosophila in a Four-quadrant Olfactometer

Published on: August 20, 2016

A digital sequence method of dynamic olfactory characterization.

Julia Schuckel1, Andrew S French

  • 1Department of Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5.

Journal of Neuroscience Methods
|April 9, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a new dynamic olfactory stimulation system using pseudo-random binary signals. This method allows for predictable odorant concentration measurements, advancing sensory system research.

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Last Updated: Jul 6, 2026

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08:52

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Published on: August 20, 2016

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Published on: January 3, 2008

Area of Science:

  • Neuroscience
  • Sensory System Dynamics
  • Olfactory Stimulation

Background:

  • Dynamic characterization of sensory systems is crucial in neuroscience.
  • Chemoreceptors are challenging to study due to difficulties in controlling and measuring chemical concentrations.
  • Previous methods for olfactory stimulation lacked precision and efficiency.

Purpose of the Study:

  • To develop an improved method for dynamic olfactory stimulation.
  • To enable accurate measurement of system dynamics in chemosensory research.
  • To overcome limitations of existing olfactory stimulation techniques.

Main Methods:

  • Utilized rapid binary switching of odorant flow with pseudo-random binary signals (maximum-length sequences, M-sequences).
  • Integrated a software shift register for signal generation.
  • Employed photoionization of a surrogate tracer gas for detection.

Main Results:

  • Demonstrated predictable dynamic odorant concentration at the sensory receptor.
  • Characterized stimulation parameters based on air flow rate and spatial location.
  • Successfully measured the frequency response function of a Drosophila electroantennogram.

Conclusions:

  • The developed system offers higher frequency range stimulation and experimental simplicity.
  • This approach enhances the study of olfactory system dynamics.
  • Provides a robust platform for investigating chemoreceptor responses.