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Related Concept Videos

Olfaction01:25

Olfaction

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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

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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: Feb 23, 2026

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Measuring Olfactory Processes in Mus musculus.

Heather Schellinck1

  • 1Dept. of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada.

Behavioural Processes
|September 9, 2017
PubMed
Summary

This review explores olfactory acuity and odor discrimination learning, focusing on neurotransmitters like noradrenaline and acetylcholine. It also examines pattern recognition and models of human disease, recommending experimental improvements for better understanding of olfactory processes.

Keywords:
AcuityMethodologyMiceOdour discriminationReview

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Area of Science:

  • Neuroscience
  • Olfactory research

Background:

  • Olfactory acuity and odor discrimination are complex processes.
  • Understanding the neural mechanisms is crucial for both basic science and disease modeling.

Purpose of the Study:

  • To review existing literature on olfactory acuity and odor discrimination learning.
  • To discuss the role of neurotransmitters (noradrenaline, acetylcholine) in these processes.
  • To assess methodologies and their impact on experimental results.

Main Methods:

  • Literature review of olfactory studies.
  • Analysis of research on neurotransmitter involvement.
  • Evaluation of pattern recognition and disease models in olfaction.

Main Results:

  • Current research highlights the involvement of noradrenaline and acetylcholine in odor discrimination.
  • Methodological variations can lead to disparate findings in olfactory studies.
  • Pattern recognition plays a role in how olfactory information is processed.

Conclusions:

  • Further research is needed to refine experimental designs for olfactory studies.
  • Improving reliability and validity is key to advancing our understanding of olfactory processes.
  • This work provides a foundation for future investigations into healthy and diseased olfactory systems.