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Dual encoding of muscle tension and eye position by abducens motoneurons


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dc.creator Davis López de Carrizosa, María América es
dc.creator Morado Díaz, Camilo José es
dc.creator Miller, Joel M es
dc.creator Rodríguez de la Cruz, Rosa María es
dc.creator Pastor Loro, Ángel Manuel es 2019-02-18T11:58:28Z 2019-02-18T11:58:28Z 2011
dc.identifier.citation Davis López de Carrizosa, M.A., Morado Díaz, C.J., Miller, .M., Rodríguez de la Cruz, R.M. y Pastor Loro, Á.M. (2011). Dual encoding of muscle tension and eye position by abducens motoneurons. Journal of neuroscience, 31 (6), 2271-2279.
dc.identifier.issn 1529-2401 es
dc.description.abstract Extraocular muscle tension associated with spontaneous eye movements has a pulse-slide-step profile similar to that of motoneuron firing rate. Existing models only relate motoneuron firing to eye position, velocity and acceleration. We measured and quantitatively compared lateral rectus muscle force and eye position with the firing of abducens motoneurons in the cat to determine fundamental encoding correlations. During fixations (step), muscle force increased exponentially with eccentric eye position, consistent with a model of estimate ensemble motor innervation based on neuronal sensitivities and recruitment order. Moreover, firing rate in all motoneurons tested was better related to eye position than to muscle tension during fixations. In contrast, during the postsaccadic slide phase, the time constant of firing rate decay was closely related to that of muscle force decay, suggesting that all motoneurons encode muscle tension as well. Discharge characteristics of abducens motoneurons formed overlapping clusters of phasic and tonic motoneurons, thus, tonic units recruited earlier and had a larger slide signal. We conclude that the slide signal is a discharge characteristic of the motoneuron that controls muscle tension during the postsaccadic phase and that motoneurons are specialized for both tension and position-related properties. The organization of signal content in the pool of abducens motoneurons from the very phasic to the very tonic units is possibly a result of the differential trophic background received from distinct types of muscle fibers. es
dc.format application/pdf es
dc.language.iso eng es
dc.publisher Society for Neuroscience es
dc.relation.ispartof Journal of Neuroscience, 31 (6), 2271-2279.
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 Internacional *
dc.rights.uri *
dc.subject motor control es
dc.subject abducens es
dc.subject oculomotor es
dc.subject motoneurons es
dc.subject muscle tension es
dc.subject eye movements es
dc.title Dual encoding of muscle tension and eye position by abducens motoneurons es
dc.type info:eu-repo/semantics/article es
dc.type.version info:eu-repo/semantics/publishedVersion es
dc.rights.accessrights info:eu-repo/semantics/openAccess es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Zoología es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Fisiología es
dc.relation.publisherversion 10.1523/JNEUROSCI.5416-10.2011 es
dc.identifier.doi 10.1523/JNEUROSCI.5416-10.2011 es
idus.format.extent 8 p. es
dc.journaltitle Journal of Neuroscience es
dc.publication.volumen 31 es
dc.publication.issue 6 es
dc.publication.initialPage 2271 es
dc.publication.endPage 2279 es
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