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The Journal of Neuroscience, August 19, 2009, 29(33):10287-10298; doi:10.1523/JNEUROSCI.0505-09.2009

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Behavioral/Systems/Cognitive
The Way an Odor Is Experienced during Aversive Conditioning Determines the Extent of the Network Recruited during Retrieval: A Multisite Electrophysiological Study in Rats

Julie Chapuis,¹ Samuel Garcia,¹ Belkacem Messaoudi,¹ Marc Thevenet,¹ Guillaume Ferreira,² Remi Gervais,¹ and Nadine Ravel¹

¹Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche (UMR) 5020 Neurosciences Sensorielles Comportement Cognition, Université Lyon 1, Université de Lyon, F-69366 Lyon, France, and ²UMR INRA 85-CNRS 6175-Université Tours, F-37380 Nouzilly, France

Correspondence should be addressed to Julie Chapuis, CNRS UMR 5020 Neurosciences Sensorielles Comportement Cognition, Université Lyon 1, 50, avenue Tony Garnier, F-69366 Lyon cedex 07, France. Email: jchapuis{at}olfac.univ-lyon1.fr

Recent findings have revealed the importance of orthonasal and retronasal olfaction in food memory, especially in conditioned odor aversion (COA); however, little is known about the dynamics of the cerebral circuit involved in the recognition of an odor as a toxic food signal and whether the activated network depends on the way (orthonasal vs retronasal) the odor was first experienced. In this study, we mapped the modulations of odor-induced oscillatory activities through COA learning using multisite recordings of local field potentials in behaving rats. During conditioning, orthonasal odor alone or associated with ingested odor was paired with immediate illness. For all animals, COA retrieval was assessed by orthonasal smelling only. Both types of conditioning induced similarly strong COA. Results pointed out (1) a predictive correlation between the emergence of powerful beta (15–40 Hz) activity and the behavioral expression of COA and (2) a differential network distribution of this beta activity according to the way the animals were exposed to the odor during conditioning. Indeed, for both types of conditioning, the aversive behavior was predicted by the emergence of a strong beta oscillatory activity in response to the odor in the olfactory bulb, piriform cortex, orbitofrontal cortex, and basolateral amygdala. This network was selectively extended to the infralimbic and insular cortices when the odor was ingested during acquisition. These differential networks could participate in different food odor memory; these results are discussed in line with recent behavioral results that indicate that COA can be formed over long odor-illness delays only if the odor is ingested.

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Received Jan. 30, 2009; revised June 15, 2009; accepted June 20, 2009.

Correspondence should be addressed to Julie Chapuis, CNRS UMR 5020 Neurosciences Sensorielles Comportement Cognition, Université Lyon 1, 50, avenue Tony Garnier, F-69366 Lyon cedex 07, France. Email: jchapuis{at}olfac.univ-lyon1.fr

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