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Related Experiment Videos

Rapid olfactory processing implicates subcortical control of an olfactomotor system.

Bradley N Johnson1, Joel D Mainland, Noam Sobel

  • 1Joint Graduate Program in Bioengineering, University of California, Berkeley, California 94720, USA. bnjohnso@socrates.berkeley.edu

Journal of Neurophysiology
|April 25, 2003
PubMed
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The brain rapidly adjusts sniff volume based on odor concentration, suggesting a subcortical feedback loop controls this olfactomotor response. This mechanism fine-tunes sniffing within milliseconds of odor detection.

Area of Science:

  • Neuroscience
  • Sensory Physiology
  • Olfactory System Research

Background:

  • Sniffing behavior is known to change with odor concentration.
  • This suggests an underlying neural feedback mechanism linking sensory input to motor output.
  • The precise timing and neural basis of this olfactomotor control remain largely uncharacterized.

Purpose of the Study:

  • To investigate the temporal dynamics of the olfactomotor feedback mechanism.
  • To determine how quickly sniff motor output adjusts to changes in odor concentration.
  • To explore the potential neural pathways involved in this rapid sensory-motor integration.

Main Methods:

  • Utilized air-dilution olfactometry with a computer-controlled system for precise odorant delivery.
  • Employed mass flow controllers, temperature, and humidity control for standardized conditions.

Related Experiment Videos

  • Measured nasal airflow with a highly sensitive pneumatotachograph to analyze sniff parameters.

    • Main Results:

    • Sniff volume demonstrated a significant inverse relationship with odor concentration (P < 0.0001).
    • Sniff flowrate became concentration-dependent as early as 160 ms (propionic acid) and 260 ms (phenethyl alcohol) after sniff onset.
    • Initial sniff phases (approx. 150 ms) were uniform and concentration-independent.

    Conclusions:

    • The rapid adjustments in sniff volume indicate a fast olfactomotor feedback loop.
    • Subcortical neural mechanisms, potentially similar to those in visual and auditory systems, likely mediate this control.
    • This feedback system allows for efficient modulation of sensory input based on odor concentration.