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Registros recuperados: 26
Primeira ... 12 ... Última
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A model of stimulus-specific neural assemblies in the insect antennal lobe Inra
Martinez, D.; Montejo, N..
A fundamental question in computational neuroscience is to understand how interactions between neurons underlie sensory coding and information storage. In the first relay of the insect olfactory system, odorant stimuli trigger synchronized activities in neuron populations. Synchronized assemblies may arise as a consequence of inhibitory coupling, because they are disrupted when inhibition is pharmacologically blocked. Using computational modelling, we studied the role of inhibitory, noisy interactions in producing stimulus-specific synchrony. So far, experimental data and modelling studies indicate that fast inhibition induces neural synchrony, but it remains unclear how desynchronization occurs. From theoretical analysis and computer simulations, we found...
Tipo: Journal Article Palavras-chave: DROSOPHILE; NEURONE; OLFACTION; INSECTE; MODELE; LOBE ANTENNAIRE; ODEUR; STIMULUS; ANALYSE STATISTIQUE OLFACTORY-BULB; INHIBITORY NEURONS; OSCILLATORY SYNCHRONIZATION; ODOR REPRESENTATION; OUTPUT NEURONS; NETWORK MODEL; DROSOPHILA; DYNAMICS; DISCRIMINATION; INFORMATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201028bfe973&uri=/notices/prodinra1/2010/10/
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Antennal pathways in the central nervous system of a blood-sucking bug, Rhodnius prolixus Inra
Barrozo, R.B.; Couton, L.; Lazzari, C.R.; Insauti, T.C.; Minoli, S.A.; Fresquet, N.; Rospars, J.P.; Anton, S..
The haematophagous bug Rhodnius prolixus has been a model system in insect physiology for a long time. Recently, several studies have been devoted to its sensory systems, including olfaction. However, few data are available on the basic organisation of the nervous system in this species. By means of neuronal backfills, histology, confocal microscopy and three-dimensional reconstruction methods, we have characterized the projection patterns of antennal sensory neurons within the central nervous system of this disease-vector insect. We established the first partial three-dimensional map of the antennal lobe (AL) of a hemipteran insect. The ALs of this species are relatively diffuse structures, which nevertheless show a glomerular organisation. Based on...
Tipo: Journal Article Palavras-chave: RHODNIUS PROLIXUS; ARTHROPODA; HEXAPODA; INSECTE; HEMIPTERA; SYSTEME NERVEUX CENTRAL; NEURONE; OLFACTION; HISTOLOGIE; MICROSCOPIE CONFOCALE; CARTE TRIDIMENSIONNELLE; LOBE ANTENNAIRE; GLOMERULE; HETEROPTERA; REDUVIIDAE ANTENNAL LOBE; THREE-DIMENSIONAL RECONSTRUCTION; QUANTITATIVE ANALYSIS; DISEASE-VECTOR INSECT; ANTENNAL PROJECTIONS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f9cf078d&uri=/notices/prodinra1/2010/11/
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Calcium activates a chloride conductance likely involved in olfactory receptor neuron repolarization in the moth Spodoptera littoralis Inra
Pézier, A.; Grauso, M.; Acquistapace, A.; Monsempes, C.; Rospars, J.P.; Lucas, P..
The response of insect olfactory receptor neurons (ORNs) to odorants involves the opening of Ca2+-permeable channels, generating an increase in intracellular Ca2+ concentration. Here, we studied the downstream effect of this Ca2+ rise in cultured ORNs of the moth Spodoptera littoralis. Intracellular dialysis of Ca2+ from the patch pipette in whole-cell patch-clamp configuration activated a conductance with a K-1/2 of 2.8 mu M. Intracellular and extracellular anionic and cationic substitutions demonstrated that Cl- carries this current. The anion permeability sequence I- > NO3- > Br- > Cl- > CH3SO(3)(-) >> gluconate(-) of the Ca2+-activated Cl- channel suggests a weak electrical field pore of the channel. The Ca2+-activated current partly...
Tipo: Journal Article Palavras-chave: CALCIUM; OLFACTION; NEURONE; RECEPTEUR; MITE; SPODOPTERA LITTORALIS; LEPIDOPTERA; INSECTE; CANAL A CALCIUM; CHLORURE; PERMEABILITE; CONCENTRATION; TENEUR EN CALCIUM NUCLEOTIDE-GATED CHANNELS; SMOOTH-MUSCLE-CELLS; PROTEIN-KINASE-C; ANTENNAL NEURONS; SENSORY NEURONS; IN-VITRO; CURRENTS; TRANSDUCTION; VOLUME; CILIA.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010398ba406&uri=/notices/prodinra1/2010/10/
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Centrally acting agents and visceral sensitivity Inra
Fioramonti, J.; Buéno, L..
Tipo: Journal Article Palavras-chave: ANTIDEPRESSEUR; SEROTONINE; AMITRIPTYLINE; HYPERSENSIBILITE; CERVEAU; NEURONE; SYSTEME NERVEUX CENTRAL; EFFET SUR LA DOULEUR; MORPHINE; SENSIBILITE INTESTINALE.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0500023816109859&uri=/notices/prodinra1/2009/11/
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Classification of stimuli based on stimulus-response curves and their variability Inra
Lansky, P.; Pokora, O.; Rospars, J.P..
Neuronal responses evoked in sensory neurons by static stimuli of various intensities are usually characterized by their input-output transfer function, i.e. by plotting the firing frequency (or any other measurable neuron response) versus the corresponding stimulus intensity. The aim of the present article is to determine the stimulus intensities which can be considered as "the most important" from two different points of view: transferring as much information as possible and coding the intensity as precisely as possible. These two problems are very different because, for example, an informative signal may be difficult to identify. We show that the role of noise is crucial in both problems. To obtain the range of stimuli which are the best identified, we...
Tipo: Journal Article Palavras-chave: BRUIT; NEURONE; STIMULUS; PROPRIETE SENSORIELLE; TEST DE FISHER; METHODE STATISTIQUE; MODELISATION; MODELE GENERIQUE; THEORIE DE L'INFORMATION; TRANSFERT DE L'INFORMATION FISHER INFORMATION; INFORMATION THEORY; NOISE; RESPONSE CURVE; SENSORY NEURONS; STIMULUS IDENTIFICATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010822d069&uri=/notices/prodinra1/2010/10/
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Cloning of an octopamine/tyramine receptor and plasticity of its expression as a function of adult sexual maturation in the male moth Agrotis ipsilon Inra
Duportets, L.; Barrozo, R.B.; Bozzolan, F.; Gaertner, C.; Anton, S.; Gadenne, C.; Debernard, S..
In the male moth Agrotis ipsilon behavioural response and antennal lobe (AL) neuron sensitivity to the female-produced sex pheromone increase with age and juvenile hormone (JH) level. We recently showed that the neuromodulator, octopamine (OA), interacts with JH in this age-dependent olfactory plasticity. To further elucidate its role, we cloned a full cDNA encoding a protein that presents biochemical features essential to OA/tyramine receptor (AipsOAR/TAR) function. The AipsOAR/TAR transcript was detected predominantly in the antennae, the brain and, more specifically, in ALs where its expression level varied concomitantly with age. This expression plasticity indicates that AipsOAR/TAR might be involved in central processing of the pheromone signal during...
Tipo: Journal Article Palavras-chave: LOBE ANTENNAIRE; LEPIDOPTERA; NOCTUIDAE; AGROPIS IPSILON; RECEPTEUR; OLFACTION; MITE; INSECTE; MATURATION SEXUELLE; ARTHROPODA; HEXAPODA; NEURONE; PHEROMONE; HORMONE; ADNC; CLONAGE; COMPORTEMENT SEXUEL; ATTRACTIF SEXUEL ANTENNAL LOBE; OCTOPAMINE/TYRAMINE RECEPTOR; OLFACTORY PROCESSING; MATURATION; EXPRESSION PLASTICITY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20102d18e75d&uri=/notices/prodinra1/2011/02/
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Competitive and noncompetitive odorant interactions in the early neural coding of odorant mixtures Inra
Rospars, J.P.; Lansky, P.; Chaput, M.; Duchamp-Viret, P..
Most olfactory receptor neurons (ORNs) express a single type of olfactory receptor that is differentially sensitive to a wide variety of odorant molecules. The diversity of possible odorant-receptor interactions raises challenging problems for the coding of complex mixtures of many odorants, which make up the vast majority of real world odors. Pure competition, the simplest kind of interaction, arises when two or more agonists can bind to the main receptor site, which triggers receptor activation, although only one can be bound at a time. Noncompetitive effects may result from various mechanisms, including agonist binding to another site, which modifies the receptor properties at the main binding site. Here, we investigated the electrophysiological...
Tipo: Journal Article Palavras-chave: CODAGE; MODELE; OLFACTION; NEURONE; RECEPTEUR; ODEUR; INTERACTION MOLECULAIRE; CONCENTRATION; ANALYSE STATISTIQUE  SENSORY CODING; OLFACTORY RECEPTOR NEURON; IN VIVO; SIGNAL TRANSDUCTION; ALLOSTERY; MIXTURE INTERACTION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105031bac0&uri=/notices/prodinra1/2010/10/
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Computational model of the insect pheromone transduction cascade Inra
Gu, Y.; Lucas, P.; Rospars, J.P..
All sensory neurons transduce their natural stimulus, whether a molecule, a photon, or a mechanical force, in an electrical current flowing through their sensory membrane via similar molecular and ionic mechanisms. Olfactory receptor neurons (ORNs), whose stimuli are volatile molecules, are no exception, including one of the best known: the exquisitely sensitive ORNs of male moths that detect the sexual pheromone released by conspecific females. We provide a detailed computational model of the intracellular molecular mechanisms at work in this ORN type. We describe qualitatively and quantitatively how the initial event, the interaction of pheromone molecules with specialized receptors at the ORN surface, is amplified through a sequence of linked...
Tipo: Journal Article Palavras-chave: MODELE; INSECTE; PHEROMONE; NEURONE; RECEPTEUR; MITE; PROTEINE; ACTIVITE ENZYMATIQUE; CANAL A CALCIUM; CANAL A POTASSIUM; PROTEINE KINASE C; CALMODULINE; OLFACTION OLFACTORY RECEPTOR NEURONS; PROTEIN-KINASE-C; DROSOPHILA ODORANT RECEPTORS; ANTHERAEA-POLYPHEMUS; CHLORIDE CURRENT; PHOSPHOLIPASE-C; BOMBYX-MORI; SENSILLA TRICHODEA; DEGRADING ENZYME; CATION CHANNELS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010634023e&uri=/notices/prodinra1/2010/10/
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Continued Neurogenesis in Adult Drosophila as a Mechanism for Recruiting Environmental Cue-Dependent Variants Inra
Rokia-Mille, S.B.; Tinette, S.; Engler, G.; Arthaud Hugonin, L.; Tares-Amichot, S.; Robichon, A..
BackgroundThe skills used by winged insects to explore their environment are strongly dependent upon the integration of neurosensory information comprising visual, acoustic and olfactory signals. The neuronal architecture of the wing contains a vast array of different sensors which might convey information to the brain in order to guide the trajectories during flight. In Drosophila, the wing sensory cells are either chemoreceptors or mechanoreceptors and some of these sensors have as yet unknown functions. The axons of these two functionally distinct types of neurons are entangled, generating a single nerve. This simple and accessible coincidental signaling circuitry in Drosophila constitutes an excellent model system to investigate the developmental...
Tipo: Journal Article Palavras-chave: DROSOPHILE; INSECTES AILES; NEURONE; ARCHITECTURE NEURONALE; AILE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201194be1698&uri=/notices/prodinra1/2011/04/
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Efficient olfactory coding in the pheromone receptor neuron of a moth Inra
Kostal, L.; Lansky, P.; Rospars, J.P..
Efficient coding is an overarching principle, well tested in visual and auditory neurobiology, which states that sensory neurons are adapted to the statistical characteristics of their natural stimulus - in brief, neurons best process those stimuli that occur most frequently. To assess its validity in olfaction, we examine the pheromone communication of moths, in which males locate their female mates by the pheromone they release. We determine the characteristics of the pheromone plume which are best detected by the male reception system. We show that they are in agreement with plume measurements in the field, so providing quantitative evidence that this system also obeys the efficient coding principle. Exploring the quantitative relationship between the...
Tipo: Journal Article Palavras-chave: ANTHERAEA POLYPHEMUS; INSECTE; LEPIDOPTERA; ANALYSE STATISTIQUE; CHEMORECEPTEUR; MODELE CINETIQUE; MITE; OLFACTION; PHEROMONE; NEURONE; RECEPTEUR; STIMULATION; COMMUNICATION; MODELISATION; PROBABILITE ORIENTAL FRUIT MOTH; ANTHERAEA-POLYPHEMUS; KINETIC-MODEL; INFORMATION; STIMULATION; PLUMES; CELLS; CHEMORECEPTORS; FLUCTUATIONS; ACTIVATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f45c7b7b&uri=/notices/prodinra1/2010/10/
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Electron microscope observations on the calyces of the insect brain National Institute of Agronomic Research
Trujillo-Cenóz, O.; Melamed, J..
The pedunculate bodies consist of three fibrillar regions: calyces, stalk, and roots. A group of small association neurons (the globule cells) lies within and around the calyces. The synaptic region of the calyces shows, under the phase contrast microscope, small, dense circumscribed areas of neuropil corresponding to the so-called “glomeruli” of light microscopists. The electron microscope demonstrated that each glomerulus consists of a large central nerve ending and several thin peripheral fibers. The central ending is filled with small vesicles. Mitochondria and dense granules are found intermixed with the vesicular material. The peripheral fibers contain mitochondria, slender tubules, and a few vesicles. The origin of the central ending and...
Tipo: Journal Article-postprint Palavras-chave: INSECT; BRAIN; NEURONE; PEDUNCULATE BODY; CALYCE; ELECTRON MICROSCOPE; INSECTE; CERVEAU.
Ano: 1962 URL: http://hdl.handle.net/2174/513
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Hedonic taste in Drosophila revealed by olfactory receptors expressed in taste neurons Inra
Hiroi, M.; Tanimura, T.; Marion-Poll, F..
Taste and olfaction are each tuned to a unique set of chemicals in the outside world, and their corresponding sensory spaces are mapped in different areas in the brain. This dichotomy matches categories of receptors detecting molecules either in the gaseous or in the liquid phase in terrestrial animals. However, in Drosophila olfactory and gustatory neurons express receptors which belong to the same family of 7-transmembrane domain proteins. Striking overlaps exist in their sequence structure and in their expression pattern, suggesting that there might be some functional commonalities between them. In this work, we tested the assumption that Drosophila olfactory receptor proteins are compatible with taste neurons by ectopically expressing an olfactory...
Tipo: Journal Article Palavras-chave: NEURONE; RECEPTEUR; PROTEINE; SENSATION; GOUT; FONCTION PHYSIOLOGIQUE; INSECTE; ARTHROPODA; HEXAPODA; STIMULUS; SUCRE; CAFEINE  OLFACTION; NEURON; PROTEIN RECEPTOR; TASTE; DROSOPHILA.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201058c69fd&uri=/notices/prodinra1/2010/10/
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Interleukin-6 activates arginine vasopressin neurons in the supraoptic nucleus during immune challenge in rats Inra
Palin, K.; Moreau, M. L..; Sauvant, J.; Orcel, H.; Nadjar, A.; Duvoid-Guillou, A.; Dudit, J.; Rabié, A.; Moos, F..
The increase of plasma arginin-vasopressin (AVP) release, which translates hypothalamic AVP neuron activation in response to immune challenge, appears to occur independently of plasma osmolality or blood pressure changes. Many studies have shown that major inflammatory mediators produced in response to peripheral inflammation, such as prostaglandin (PG)-E2 and interleukin (IL)-1β, excite AVP neurons. However, in vivo electrical activation of AVP neurons was still not assessed in relation to plasma AVP release, osmolality, or blood pressure or to the expression and role of inflammatory molecules like PG-E2, IL-1β, IL-6, and tumor necrosis factor-{alpha} (TNF{alpha}). This study aims at elucidating those factors that underlie the activation of AVP neurons in...
Tipo: Journal Article Palavras-chave: HORMONE ANTIDIURÉTIQUE; NEURONE; CERVEAU; DIURÈSE; OSMOLALITÉ; PRESSION ARTÉRIELLE; NOYAU SUPRA-OPTIQUE; PLASMA; PROSTAGLANDINE; INTERLEUKINE; FACTEUR DE NÉCROSE TUMORALE; ACTIVATION DES NEURONES LIPOPOLYSACCHARIDE INDUCED-HYPOTHALAMIC VASOPRESSIN NEURON ACTIVATION; BRAIN CYTOKINES; DIURESIS; PLASMA OSMOLALITY; BLOOD PRESSURE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009179193ce&uri=/notices/prodinra1/2010/09/
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Mating-induced transient inhibition of responses to sex pheromone in a male moth is not mediated by octopamine or serotonin Inra
Barrozo, R.; Jarriault, D.; Simeone, X.; Gaertner, C.; Gadenne, C.; Anton, S..
In the male moth, Agrotis ipsilon, mating induces a transient inhibition of behavioural and central nervous responses to sex pheromone. Newly mated males are not attracted to sex pheromone, and the sensitivity of their antennal lobe (AL) neurons is lower than in virgin males. This rapid transient olfactory inhibition prevents them from re-mating unsuccessfully until they have refilled their sex glands. We hypothesized that this olfactory ‘switch off’ might be controlled by neuromodulators such as biogenic amines. To test our hypothesis, we studied the effects of octopamine (OA) and serotonin (5-hydroxytryptamine, 5-HT) on the coding properties of pheromone-sensitive AL neurons in virgin and newly mated males. We show that AL neuron sensitivity increased in...
Tipo: Journal Article Palavras-chave: AGROTIS IPSILON; INSECTE; MITE; OLFACTION; ODEUR; LOBE ANTENNALE; PHEROMONE SEXUELLE; ATTRACTIF SEXUEL; SEROTONINE; PLASTICITE; SYSTEME NERVEUX CENTRAL; NEURONE; RECEPTEUR; OCTOPAMINE; NOCTUIDAE; LEPIDOPTERA OLFACTORY CODING; MOTH; ANTENNAL LOBE; SEX PHEROMONE; PROJECTION NEURON; MATING; OCTOPAMINE; SEROTONIN; PLASTICITY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e7ad9fc3&uri=/notices/prodinra1/2010/09/
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Modelling and sensitivity analysis of the reactions involving receptor, G-protein and effector in vertebrate olfactory receptor neurons Inra
Halnes, G.; Ulfhielm, E.; Eklöf Ljunggren, E.; Hellgren-Kotaleski, J.; Rospars, J.P..
A biochemical model of the receptor, G-protein and effector (RGE) interactions during transduction in the cilia of vertebrate olfactory receptor neurons (ORNs) was developed and calibrated to experimental recordings of cAMP levels and the receptor current (RC). The model describes the steps from odorant binding to activation of the effector enzyme which catalyzes the conversion of ATP to cAMP, and shows how odorant stimulation is amplified and delayed by the RGE transduction cascade. A time-dependent sensitivity analysis was performed on the model. The model output-the cAMP production rate-is particularly sensitive to a few, dominant parameters. During odorant stimulation it depends mainly on the initial density of G-proteins and the catalytic constant for...
Tipo: Journal Article Palavras-chave: NEURONE; RECEPTEUR; MODELE BIOCHIMIQUE; MODELISATION; PROTEINE; ANALYSE STATISTIQUE; SENSITIVITE OLFACTION; RECEPTOR NEURON; BIOCHEMICAL MODEL; SENSITIVITY ANALYSIS; RECEPTOR POTENTIAL; SIGNAL TRANSDUCTION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010de3b6771&uri=/notices/prodinra1/2010/10/
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Molecular evolution of the crustacean hyperglycemic hormone family in ecdysozoans Inra
Montagné, N.; Desdevises, Y.; Soyez, D.; Toullec, J.-Y..
Background: Crustacean Hyperglycemic Hormone (CHH) family peptides are neurohormones known to regulate several important functions in decapod crustaceans such as ionic and energetic metabolism, molting and reproduction. The structural conservation of these peptides, together with the variety of functions they display, led us to investigate their evolutionary history. CHH family peptides exist in insects (Ion Transport Peptides) and may be present in all ecdysozoans as well. In order to extend the evolutionary study to the entire family, CHH family peptides were thus searched in taxa outside decapods, where they have been, to date, poorly investigated. Results: CHH family peptides were characterized by molecular cloning in a branchiopod crustacean, Daphnia...
Tipo: Journal Article Palavras-chave: HORMONE; GLYCEMIE; TENEUR EN SUCRE; HYPERGLYCEMIE; PROTEINE; ANALYSE PHYLOGENETIQUE; VITELLOGENESE; NEURONE; PEPTIDE; TENEUR EN PROTEINE; CLONAGE MOLECULAIRE; SEQUENCE NUCLEOTIDIQUE; PHYLOGENIE; PCR; ACIDE AMINE; BRACHIOPODA; COLLEMBOLA; EUCARYOTE; DAPHNIA MAGNA; FOLSOMIA CANDIDA; ECDYSOZOA VITELLOGENESIS-INHIBITING ACTIVITY; ARMADILLIDIUM-VULGARE CRUSTACEA; SHRIMP LITOPENAEUS-VANNAMEI; TRANSPORT PEPTIDE ITP; MAXIMUM-LIKELIHOOD; NUCLEOTIDE SUBSTITUTION; PHYLOGENETIC ANALYSIS; PERIPHERAL NEURONS; PROTEIN EVOLUTION; EYESTALK REMOVAL.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107696ebf9&uri=/notices/prodinra1/2010/10/
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Neuroanatomical organization of gonadotropin-releasing hormone neurons during the oestrus cycle in the ewe Inra
Batailler, M.; Caraty, A.; Malpaux, B.; Tillet, Y..
Tipo: Journal Article Palavras-chave: NEUROANATOMIE; CYCLE OESTRIEN; GNRH; LH; NEURONE; OESTROGENE; PLASTICITE; PHASE FOLLICULAIRE; PHASE PROGESTATIVE; REPRODUCTION.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0500034004110592&uri=/notices/prodinra1/2009/11/
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Ordinary glomeruli in the antennal lobe of male and female tortricid moth Grapholita molesta (Busck) (Lepidoptera: Tortricidae) process sex pheromone and host-plant volatiles Inra
Varela, N.; Avilla, J.; Gemeno, C.; Anton, S..
Both sexes of Grapholita molesta, a key pest of stone fruits, are able to detect host-plant volatiles and the sex pheromone emitted by females, and to modify their behaviour accordingly. How olfactory information is processed in the central nervous system is unknown. Intracellular recordings and stainings were used to characterize antennal lobe (AL) neuron responses to single pheromone components, a behaviourally active blend of five peach volatiles and a pear-fruit ester. AL neurons with different response patterns responded to pheromone components and plant volatiles. In males more neurons responded specifically to the main pheromone component than in females, whereas neurons responding to all three pheromone components were more abundant in females....
Tipo: Journal Article Palavras-chave: LOBE ANTENNAIRE; CYDIA MOLESTA; ARTHROPODA; HEXAPODA; TORTRICIDAE; INSECTE; PHEROMONE SEXUELLE; ATTRACTIF SEXUEL; NEURONE; ODEUR; GLOMERULE GRAPHOLITA MOLESTA; OLFACTION; ANTENNAL LOBE; PHEROMONE; INTRACELLULAR RECORDING AND STAINING.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201157fcd7c0&uri=/notices/prodinra1/2011/03/
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Ornstein-Uhlenbeck model neuron revisited Inra
Lansky, P.; Rospars, J.P..
The temporal patterns of action potentials fired by a two-point stochastic neuron model were investigated. In this model the membrane potential of the dendritic compartment follows the Orstein-Uhlenbeck process and is not affected by the spiking activity. The axonal compartment, corresponding to the spike initiation site, is described by a simplified RC circuit. Estimators of the mean and variance of the input, based on a sampling of the axonal membrane potential, were derived and applied to simulated data. The dependencies of the mean firing frequency and of the coefficient of variation and serial correlation of interspike intervals on the mean and variance of the input were also studied by computer simulation in both 1- and 2-point models. The main...
Tipo: Journal Article Palavras-chave: FREQUENCE LINEAIRE; NEURONE; BRUIT.
Ano: 1995 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9600003053057621&uri=/notices/prodinra1/2010/11/
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Quantitative analysis of sex-pheromone coding in the antennal lobe of the moth Agrotis ipsilon: a tool to study network plasticity Inra
Jarriault, D.; Gadenne, C.; Rospars, J.P.; Anton, S..
To find a mating partner, moths rely on pheromone communication. Released in very low amounts, female sex pheromones are used by males to identify and localize females. Depending on the physiological state (i.e. age, reproductive state), the olfactory system of the males of the noctuid moth Agrotis ipsilon is `switched on or off'. To understand the neural basis of this behavioural plasticity, we performed a detailed characterization of the qualitative, quantitative and temporal aspects of pheromone coding in the primary centre of integration of pheromonal information, the macroglomerular complex (MGC) of the antennal lobe. MGC neurons were intracellularly recorded and stained in sexually mature virgin males. When stimulating antennae of males with the...
Tipo: Journal Article Palavras-chave: AGROTIS IPSILON; ARTHROPODA; HEXAPODA; INSECTE; PHEROMONE; MITE; PLASTICITE; ATTRACTIF SEXUEL; NEURONE; OLFACTION; LOBE ANTENNAIRE OLFACTORY CODING; MOTH; ANTENNAL LOBE; SEX-PHEROMONE; PROJECTION NEURON; SPIKE TRAIN ANALYSIS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010352d8cb4&uri=/notices/prodinra1/2010/10/
Registros recuperados: 26
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