Rôle de l'inhibition intra- et inter-glomérulaire dans la synchronisation neuronale et le codage phéromonal chez manduca sexta

ISBN : 978-2-9532965-0-1Une synchronisation neuronale est observée dès le premier étage de traitement du système olfactif, à savoir le lobe antennaire chez l'insecte. Dans le cas du papillon de nuit Manduca sexta, cette synchronisation est plus importante en présence du mélange phéromonal qu'en présence d'un composé simple. Dans cet article, nous proposons un modèle du complexe macroglomérulaire qui reproduit les données expérimentales et permet de mettre en lumière le rôle de l'inhibition intra- et inter-glomérulaire dans la synchronisation neuronale et le codage phéromonal

A computational model of the moth macroglomerular complex Belmabrouk

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The uses of mid-infrared spectral information from milk recording organization to certify milk geographic origin

peer reviewedThis study investigated the opportunity to detect the geographic origin of milk from the midinfrared (MIR) analysis of milk. Milk MIR spectral data related to milk recording data were available in the Belgium Walloon Region via European project OptiMIR (INTERREG IVB North West Europe Program). In Wallonia, the Ardenne region is associated to a traditional product of the area, a appellation d'origine “Beurre d’Ardennes”. Therefore, discrimination studies were conducted to distinguish Ardennes region from the rest of Wallonia. A total of 542,733 Walloon spectral records linked to their geographic origin were used (97,369 of MIR spectra for Ardennes region and 450,326 for the rest of Wallonia). The spectral data selected and pre-treated were adjusted for the effects of breeds, months, years and days in milk using ab appropriate mixed model. To test the MIR ability for milk authentication, chemometric tools, such as quadratic discriminant analysis were applied to the adjusted spectrafor three MIR spectral regions (e.g. 930-1600 cm-1, 1710-1810 per cm and 2560-2990 per cm). Results of classification showed that 94% of the records from the Ardernnes region were properly classified. Based on this results, MIR spectroscopy techniques may provide useful fingerprints to detect geographic origin and could be potentially used in routine management decision and quality assurance tools

Modelling the cellular mechanisms underlying the multiphasic response of moth pheromone-sensitive projection neurons

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Modelling the cellular mechanisms underlying the multiphasic response of moth pheromone-sensitive projection neurons (PNs)

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Modelling the cellular mechanisms underlying the multiphasic response of moth pheromone-sensitive projection neurons

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Interaction of cellular and network mechanisms for efficient pheromone coding in moths

Sensory systems, both in the living and in machines, have to be optimized with respect to their environmental conditions. The pheromone subsystem of the olfactory system of moths is a particularly well-defined example in which rapid variations of odor content in turbulent plumes require fast, concentration-invariant neural representations. It is not clear how cellular and network mechanisms in the moth antennal lobe contribute to coding efficiency. Using computational modeling, we show that intrinsic potassium currents (IA and ISK) in projection neurons may combine with extrinsic inhibition from local interneurons to implement a dual latency code for both pheromone identity and intensity. The mean latency reflects stimulus intensity, whereas latency differences carry concentration-invariant information about stimulus identity. In accordance with physiological results, the projection neurons exhibit a multiphasic response of inhibitionexcitationinhibition. Together with synaptic inhibition, intrinsic currents IA and ISK account for the first and second inhibitory phases and contribute to a rapid encoding of pheromone information. The first inhibition plays the role of a reset to limit variability in the time to first spike. The second inhibition prevents responses of excessive duration to allow tracking of intermittent stimuli

Role of local inhibition and neuronal properties in a model of the moth macroglomerular complex.

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Modelling the cellular mechanisms underlying the multiphasic response of moth pheromone-sensitive projection neurons

International audienc