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Related Experiment Video

Updated: Feb 9, 2026

Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Active Sampling State Dynamically Enhances Olfactory Bulb Odor Representation.

Rebecca Jordan1, Izumi Fukunaga1, Mihaly Kollo1

  • 1Neurophysiology of Behaviour Laboratory, Francis Crick Institute, London NW1 5AT, UK; Department of Neuroscience, Physiology & Pharmacology, University College London, London WC1E 6BT, UK.

Neuron
|June 5, 2018
PubMed
Summary
This summary is machine-generated.

Mice actively sniff to enhance olfactory bulb (OB) odor processing during learning. This active sampling, particularly in tufted cells, boosts odor representation rapidly, exceeding simple feedforward input.

Keywords:
active samplingbehaviorcontextlearningolfactionolfactory bulbsniffing

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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Sensory processing

Background:

  • The olfactory bulb (OB) is crucial for initial odor information processing.
  • Contextual and learned information significantly modulates OB activity.
  • Understanding the mechanisms of this modulation is key to olfactory research.

Purpose of the Study:

  • To investigate the mechanistic basis of contextual modulation in the olfactory bulb.
  • To examine how rapid learning episodes affect odor responses in mitral/tufted cells (MTCs).
  • To correlate active sniffing strategies with changes in odor representation.

Main Methods:

  • Whole-cell recordings were used to measure odor responses in identified MTCs.
  • Odor responses were analyzed across rapid learning episodes in mice.
  • Active sniffing behaviors were monitored and correlated with neural activity.

Main Results:

  • Diverse odor response changes in MTCs occurred within the first sniff cycle during learning.
  • Active sniffing strategies developed by motivated mice corresponded with enhanced odor representation.
  • Response changes during active sampling surpassed predictions from feedforward input alone.
  • Response changes were highly correlated in tufted cells but not mitral cells, indicating cell-type specificity.

Conclusions:

  • Active sampling is strongly linked to enhanced olfactory bulb responsiveness on rapid timescales.
  • Cell-type-specific mechanisms contribute to odor representation during active sampling.
  • Behavioral strategies like active sniffing play a significant role in olfactory perception and learning.