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Piriform cortex functional heterogeneity revealed by cellular responses to odours
P Litaudon1, C Amat, B Bertrand
1Neurosciences et Systèmes Sensoriels, Université Lyon I-CNRS, 50 avenue Tony Garnier, 69366 Lyon cedex 07, France. litaudon@olfac.University-lyon1.fr
The European Journal of Neuroscience
|June 20, 2003
Summary
The piriform cortex (PC) processes smells differently across its regions. Anterior PC responds during breathing transitions, while posterior PC activity is linked to inhalation or exhalation, revealing functional specialization.
Area of Science:
- Neuroscience
- Olfactory System Research
Background:
- The piriform cortex (PC) role in olfactory processing is largely unknown.
- Previous studies on PC neuron responses to odors overlooked functional heterogeneity.
Purpose of the Study:
- Investigate spatial functional heterogeneity of the piriform cortex.
- Characterize piriform cortex neuron responses to odors across anterior-posterior regions.
Main Methods:
- Recorded extracellular neuronal activity in urethane-anesthetized rats.
- Stimulated rats with odors, analyzing responses across the anterior to posterior piriform cortex.
- Examined cell activity synchronization with breathing patterns.
Main Results:
- A significant percentage of PC cells were silent at rest, increasing from anterior to posterior.
- Many cells showed no response to odors, with non-responsiveness increasing anteriorly to posteriorly.
- Neuronal activity synchronized with respiration; anterior PC showed phase-locking with inhalation-exhalation transitions, posterior PC with inhalation/exhalation.
Conclusions:
- Data confirm spatial functional heterogeneity within the piriform cortex.
- Anterior PC activity may be driven by olfactory bulb afferents.
- Posterior PC activity likely involves more complex entrainment mechanisms.