Complejidad de patrones dinámicos en oscilaciones estocásticas corticales

dc.contributor.advisorAlonso Malaver, Carlos Eduardospa
dc.contributor.advisorMartínez H, Johannspa
dc.contributor.authorMendoza Ruiz, Jorgespa
dc.date.accessioned2020-07-08T15:45:16Zspa
dc.date.available2020-07-08T15:45:16Zspa
dc.date.issued2020-01-20spa
dc.description.abstractThis work presents the results of the study of two dynamical parameters from cortical stochastic oscillations in time series of a 40-subjects group of healthy adults in resting state (RS): normalized permutation entropy (H) and statistical complexty (C). 190 signals from different cortical regions of interest (ROI) were analyzed in four frequency bands broadly used in neuroscience, especially alpha band due to its high association with RS. Through symbolic representation, ordinal patterns distribution is obtained for each signal, and it is used to compute the statistics H and C in different frequency bands. A relationship between these parameters, frequency bands and observation dimension (D) was observed, as well as an spatial clustering is revealed for the ROI with greater dynamic parameter values in different lobes. Furthermore to the objectives of this work, the clustering coeficient was computed as a measure of centrality of functional networks obtained for each frequency band. A high dynamic and topological parameter values are observed in occipital and parietal lobes for alpha frequency band revealing relevant cortical activity in such regions of high cognitive processing during ER. A potential linear relationship between dynamics and structure through H and clustering coeficient was explored. It was concluded the absense of such relationship between these parameters globally and discriminated by cortical lobe.spa
dc.description.abstractEn el presente trabajo se exponen los resultados del estudio de dos parámetros dinámicos de oscilaciones estocásticas corticales en mediciones realizadas a 40 sujetos sanos en estado de reposo (ER): la entropía de permutación normalizada (H) y la complejidad estadística (C). Se estudian 190 series de tiempo de diferentes regiones de interés (ROI) de la corteza cerebral para cuatro bandas de frecuencia ampliamente trabajadas en neurociencia, especialmente la banda alpha, debido a su alta asociación al ER. Por medio de la representacion simbólica se obtiene la distribución de los patrones de orden de cada serie, a partir de las cuales se computan los estadísticos H y C en las bandas de frecuencia. Se observa una relación entre los parámetros dinámicos respecto a la banda de frecuencia, la dimensión de observacion (D) y la concentración espacial de las ROI que tienen mayores valores en los parámetros dinámicos asociando lobulos corticales específi cos en cada banda de frecuencia. Adicionalmente a los objetivos de esta tesis, se explora el parámetro estructural del coe ficiente de agrupamiento como medida de centralidad de las redes funcionales obtenidas para cada banda de frecuencia. La banda de frecuencia alpha exhibe altos valores de parámetros dinámicos y topólogicos en los lóbulos occipital y parietal, revelando la existencia de actividad cortical relevante en dichas regiones durante ER. Además, se estudia la posible existencia de una relación lineal entre la dinámica y estructura, representadas en el parámetro H y el coe ficiente de agrupamiento. Se determina así, una ausencia de relaciones lineales entre ambos parámetros a nivel general al discriminar por lóbulo cortical.spa
dc.description.additionalLos resultados obtenidos en el presente trabajo se han presentado en un manuscrito, en conjunto con otros colaboradores, a la revísta científica Chaos.spa
dc.description.degreelevelMaestríaspa
dc.format.extent58spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.citationMendoza-Ruiz, Jorge (2020) Complejidad de patrones en oscilaciones estocásticas corticales. Maestría thesis, Universidad Nacional de Colombia - Sede Bogotá.spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/77753
dc.language.isospaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentDepartamento de Estadísticaspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Estadísticaspa
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dc.rightsDerechos reservados - Universidad Nacional de Colombiaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial 4.0 Internacionalspa
dc.rights.spaAcceso abiertospa
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/spa
dc.subject.ddc500 - Ciencias naturales y matemáticasspa
dc.subject.proposalBandas de frecuenciaspa
dc.subject.proposalFrequency bandseng
dc.subject.proposalPatrones de ordenspa
dc.subject.proposalOrdinal Patterneng
dc.subject.proposalEntropyeng
dc.subject.proposalEntropíaspa
dc.subject.proposalComplexityeng
dc.subject.proposalComplejidadspa
dc.subject.proposalSistema dinámicospa
dc.subject.proposalDynamical Systemeng
dc.subject.proposalRedes complejasspa
dc.subject.proposalComplex networkseng
dc.titleComplejidad de patrones dinámicos en oscilaciones estocásticas corticalesspa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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