Spontaneous activity of first- and second-order neurons in the frog olfactory system
Identifieur interne : 001340 ( Main/Exploration ); précédent : 001339; suivant : 001341Spontaneous activity of first- and second-order neurons in the frog olfactory system
Auteurs : Jean-Pierre Rospars [France] ; Petr Lánsk [République tchèque] ; Jean Vaillant [France] ; Patricia Duchamp-Viret [France] ; André Duchamp [France]Source :
- Brain Research [ 0006-8993 ] ; 1994.
English descriptors
- KwdEn :
Abstract
The spontaneous activity of first-order neurons (neuroreceptors of the mucosa) and second-order neurons (mitral cells of the bulb) was recorded extracellularly in the frog olfactory system. To assess the influence of peripheral inputs upon mitral cells, the bulb was either normally connected or partially deafferented. Our first set of findings concern the firing behavior. We found that most neurons generated interspike intervals (ISIs) that were stationary in mean and variance, and were not serially correlated at first and second order. Individual spikes in mitral cells and bursts of spikes in neuroreceptors were found to be generated by a Poisson process. Stochastic modeling suggests that the Poissonian behavior depends on the mean value of the membrane potential at the axon hillock. In these models, the mean potential in mitral cells would be far below the firing threshold and in neuroreceptors it would fluctuate at random between two states, one close to resting potential (between bursts) and the other close to the firing threshold with occasional crossings (within bursts). Secondly, partially deafferented mitral cells had significantly higher activity and lower variance than mitral cells receiving normal afferent input. This effect gives evidence that peripheral inputs influence mitral cells at rest not only through direct excitation but also through indirect inhibition exerted by local neurons. Thus, the unstimulated state of the olfactory bulb would not be qualitatively different from its stimulated state in the sense that both states involve the same types of synaptic interactions. Consequently, understanding the synaptic relationships that take place in the bulb network can benefit from studies of its spontaneous activity.
Url:
DOI: 10.1016/0006-8993(94)90793-5
Affiliations:
- France, République tchèque
- Auvergne-Rhône-Alpes, Bohême centrale, Rhône-Alpes, Île-de-France
- Lyon, Prague, Versailles, Villeurbanne
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when="1994">1994</date><biblScope unit="volume">662</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="31">31</biblScope><biblScope unit="page" to="44">44</biblScope></imprint><idno type="ISSN">0006-8993</idno></series><idno type="istex">EF0B4EE3F572C6C418E99CED0EDC5F5BDE87A410</idno><idno type="DOI">10.1016/0006-8993(94)90793-5</idno><idno type="PII">0006-8993(94)90793-5</idno><idno type="ArticleID">94907935</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0006-8993</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Mitral cell</term><term>Olfaction</term><term>Receptor cell</term><term>Single neuron modeling</term><term>Spontaneous activity</term><term>Stochastic process</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The spontaneous activity of first-order neurons (neuroreceptors of the mucosa) and second-order neurons (mitral cells of the bulb) was recorded extracellularly in the frog olfactory system. To assess the influence of peripheral inputs upon mitral cells, the bulb was either normally connected or partially deafferented. Our first set of findings concern the firing behavior. We found that most neurons generated interspike intervals (ISIs) that were stationary in mean and variance, and were not serially correlated at first and second order. Individual spikes in mitral cells and bursts of spikes in neuroreceptors were found to be generated by a Poisson process. Stochastic modeling suggests that the Poissonian behavior depends on the mean value of the membrane potential at the axon hillock. In these models, the mean potential in mitral cells would be far below the firing threshold and in neuroreceptors it would fluctuate at random between two states, one close to resting potential (between bursts) and the other close to the firing threshold with occasional crossings (within bursts). Secondly, partially deafferented mitral cells had significantly higher activity and lower variance than mitral cells receiving normal afferent input. This effect gives evidence that peripheral inputs influence mitral cells at rest not only through direct excitation but also through indirect inhibition exerted by local neurons. Thus, the unstimulated state of the olfactory bulb would not be qualitatively different from its stimulated state in the sense that both states involve the same types of synaptic interactions. Consequently, understanding the synaptic relationships that take place in the bulb network can benefit from studies of its spontaneous activity.</div></front></TEI><affiliations><list><country><li>France</li><li>République tchèque</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Bohême centrale</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Lyon</li><li>Prague</li><li>Versailles</li><li>Villeurbanne</li></settlement></list><tree><country name="France"><noRegion><name sortKey="Rospars, Jean Pierre" sort="Rospars, Jean Pierre" uniqKey="Rospars J" first="Jean-Pierre" last="Rospars">Jean-Pierre Rospars</name></noRegion><name sortKey="Duchamp Viret, Patricia" sort="Duchamp Viret, Patricia" uniqKey="Duchamp Viret P" first="Patricia" last="Duchamp-Viret">Patricia Duchamp-Viret</name><name sortKey="Duchamp, Andre" sort="Duchamp, Andre" uniqKey="Duchamp A" first="André" last="Duchamp">André Duchamp</name><name sortKey="Rospars, Jean Pierre" sort="Rospars, Jean Pierre" uniqKey="Rospars J" first="Jean-Pierre" last="Rospars">Jean-Pierre Rospars</name><name sortKey="Vaillant, Jean" sort="Vaillant, Jean" uniqKey="Vaillant J" first="Jean" last="Vaillant">Jean Vaillant</name></country><country name="République tchèque"><region name="Bohême centrale"><name sortKey="Lansk, Petr" sort="Lansk, Petr" uniqKey="Lansk P" first="Petr" last="Lánsk">Petr Lánsk</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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