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Related Concept Videos

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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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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Non-invasive recording from the human olfactory bulb.

Behzad Iravani1, Artin Arshamian2,3, Kathrin Ohla4,5

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Summary

Researchers developed the Electrobulbogram (EBG), a novel non-invasive method to record signals from the human olfactory bulb (OB). This technique offers millisecond precision for studying olfactory processing and related neuropathologies.

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Olfactory System Research

Background:

  • Current non-invasive neuroimaging techniques cannot assess neural activity in the human olfactory bulb (OB).
  • The OB plays a crucial role in olfactory tasks and is implicated in various neuropathologies.
  • Existing methods lack the precision to study OB function in real-time.

Purpose of the Study:

  • To introduce a novel method for non-invasive, high-precision signal recording from the human olfactory bulb.
  • To validate the Electrobulbogram (EBG) as a reliable measure of OB activity.
  • To establish a tool for advancing olfactory research and clinical diagnostics.

Main Methods:

  • Utilized electroencephalography (EEG) electrodes placed at the nasal bridge.
  • Developed a new recording technique termed Electrobulbogram (EBG).
  • Validated signal localization to the OB and assessed temporal precision.

Main Results:

  • Demonstrated that EEG signals from the nasal bridge accurately represent human OB responses.
  • Confirmed the millisecond precision of the EBG recordings.
  • Showed that EBG signals are localized to the OB, reliable, and consistent with animal models.

Conclusions:

  • The Electrobulbogram (EBG) is a viable, non-invasive method for recording human OB activity.
  • EBG offers potential for translational olfactory research and clinical applications in neurodegenerative diseases.
  • This technique provides a new window into central olfactory processing.