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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.
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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.
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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: Jun 16, 2025

Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Published on: October 31, 2011

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Odor encoding by fine-timescale spike synchronization patterns in the olfactory bulb.

Jesse C Werth1, Matthew Einhorn1, Thomas A Cleland1

  • 1Department of Psychology, Cornell University, Ithaca, New York, United States.

Journal of Neurophysiology
|June 14, 2025
PubMed
Summary
This summary is machine-generated.

Olfactory bulb gamma oscillations synchronize specific neuron populations, encoding odor quality, not concentration. This spike timing mechanism allows for concentration-invariant odor information transfer.

Keywords:
gamma oscillationsmultielectrode arrayoptogeneticsslice electrophysiologyspike timing

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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Neural oscillations

Background:

  • Mammalian olfactory bulb (OB) generates endogenous gamma oscillations during odor sampling.
  • These oscillations involve neural circuit dynamics and millisecond-timescale spike timing constraints.
  • The role of OB gamma oscillations in odor representation remains unclear.

Purpose of the Study:

  • To investigate if gamma-timescale spike synchronization is odor-specific and replicable.
  • To determine if spike-timing metrics perform additional signal processing.
  • To understand how OB neural dynamics encode odor information.

Main Methods:

  • Utilized OB slice recordings.
  • Employed optogenetic stimulation to create 'fictive odorants' via patterned stimulation of olfactory sensory neuron arbors.
  • Analyzed spike timing dynamics and synchronization patterns.

Main Results:

  • A subset of mitral/tufted cells strongly phase-locked to evoked gamma oscillations.
  • These cells exhibited tightly coupled spike-spike synchrony on the gamma timescale.
  • Synchronized neuron populations encoded fictive odorant quality, not concentration, and were conserved across trials.

Conclusions:

  • OB gamma-timescale spike synchronization is a concentration-invariant mechanism for encoding and exporting odor information.
  • This temporal coding is crucial for piriform cortex processing.
  • Non-synchronized spikes are less likely to contribute to ensemble odor representation.