Chem. Senses 25: 561-573,
2000
© Oxford University Press 2000
Exposure to Behaviourally Relevant Odour Reveals Differential Characteristics in Rat Central Olfactory Pathways as Studied through Oscillatory Activities
Institut des Sciences Cognitives, CNRS-UPR 9075, 67 Boulevard Pinel, F-69675 Bron, France, 1 Department of Zoology, University of Oklahoma, Norman, OK 73019, USA and 2 Neurosciences et Systèmes Sensoriels, ERS 5020, CNRS-UCB Lyon I, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
Correspondence to be sent to: Rémi Gervais, Institut des Sciences Cognitives, CNRS UPR 9075, 67 Boulevard Pinel, F-69675 Bron, France. e-mail: chabaud{at}isc.cnrs.fr
This study investigated how changes in nutritional motivation modulate odour-related oscillatory activities at several levels of the olfactory pathway in non-trained rats. Local field potential recordings were obtained in freely moving animals in the olfactory bulb (OB), anterior and posterior parts of the piriform cortex (APC and PPC respectively) and lateral entorhinal cortex (EC). Dynamic signal analysis detected changes in power during odour presentation for several frequency bands The results showed that in most cases odour presentation was associated with changes in a wide 15–90 Hz frequency band of activity in each olfactory structure. However, nutritional state modulated initial responses to food odour (FO) in the OB and EC selectively in the 15–30 Hz frequency band. Changes in nutritional state also modulated responses to repeated FO stimuli. Habituation was expressed differentially across structures with a clear dissociation between the two parts of the piriform cortex. Finally, systemic injections of scopolamine (0.125 mg/kg) selectively blocked expression of the nutritional modulation in the OB found in the ß band. These results suggest that internal state can differentially modulate odour processing among different olfactory areas and point to a cholinergic-sensitive ß band oscillation during presentation of a behaviourally meaningful odorant.
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