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The Projections of Mitral Cells from Small Local Regions of the Olfactory Bulb: An Anterograde Tracing Study Using PHA-L (Phaseolus vulgaris Leucoagglutinin).

The European journal of neuroscience·1991

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Temporal Patterns in Spontaneous and Odour-evoked Mitral Cell Discharges Recorded in Anaesthetized Freely Breathing

M. A. Chaput¹, N. Buonviso, F. Berthommier

¹Laboratoire de Physiologie Neurosensorielle, CNRS, Université Claude Bernard, Lyon I, 69622 Villeurbanne Cedex, France.

The European Journal of Neuroscience

|January 1, 1992

Summary

Mitral cell activity in the olfactory system synchronizes with respiration during odor stimulation. Unsynchronized cells become synchronized, suggesting enhanced responsiveness to olfactory inputs.

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Area of Science:

Neuroscience
Olfactory System
Respiratory Physiology

Background:

Mitral cells are key components of the olfactory bulb.
Their activity patterns during respiration are not fully understood.
How odor stimulation alters these patterns requires detailed investigation.

Purpose of the Study:

To investigate mitral cell activity distribution during the respiratory cycle in freely breathing animals.
To determine how odor stimulation modifies these temporal activity patterns.

Main Methods:

Analysis of 1408 recorded mitral cell activity sequences.
Observation of spontaneous activity and activity during odor stimulation.
Categorization of activity patterns as unsynchronized, simple excitatory, simple suppressive, or complex synchronized.

Main Results:

Most spontaneous mitral cell activity was unsynchronized with respiration.
Odor stimulation induced a high proportion of synchronized patterns (excitatory, suppressive, complex).
Synchronized patterns phase-locked to specific respiratory phases, with shifts observed during stimulation.

Conclusions:

Odor stimulation significantly alters mitral cell activity, inducing synchronization.
Unsynchronized mitral cells show a greater propensity to become synchronized under stimulation.
This suggests a mechanism for enhanced olfactory processing of sensory information.