Learning-induced oscillatory activities correlated to odour recognition: a network activity

In trained behaving rats, the expression of a prominent beta oscillatory activity in the olfactory system was previously identified as a correlate of odour recognition. The aim of the present study was to assess the putative role of a functional coupling between the olfactory bulb (OB) and higher st...

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Bibliographic Details
Published in:The European journal of neuroscience 2006-04, Vol.23 (7), p.1801-1810
Main Authors: Martin, Claire, Gervais, Rémi, Messaoudi, Belkacem, Ravel, Nadine
Format: Article
Language:English
Subjects:
Anesthetics, Local - pharmacology
Animals
Cerebral Cortex - physiology
Discrimination Learning
Electrophysiology
Feedback
feedback control
Lidocaine - pharmacology
Life Sciences
Male
Nerve Net
neural assemblies
neural plasticity
Odorants
Olfactory Bulb - physiology
olfactory system
Periodicity
rat
Rats
Rats, Wistar
Recognition (Psychology)
Smell
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Summary:In trained behaving rats, the expression of a prominent beta oscillatory activity in the olfactory system was previously identified as a correlate of odour recognition. The aim of the present study was to assess the putative role of a functional coupling between the olfactory bulb (OB) and higher structures in this activity. We performed a unilateral inactivation of the medial part of the olfactory peduncle by lidocaine infusion. Inactivation deprived the OB from most of its centrifugal afferences, including feedback connections from the piriform cortex (PC) while sparing the ascending fibres from the OB to higher cortical structures. This treatment reduced the amplitude of odour‐induced oscillatory beta responses both in OB and PC. In parallel, gamma activity classically observed in these two structures during spontaneous activity displayed a strong enhancement. Results suggest that odour‐induced oscillatory response could be the emergent feature of an olfactory functional network set up through learning.
ISSN:0953-816X
1460-9568
DOI:10.1111/j.1460-9568.2006.04711.x