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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influ?ncia da postura da m?o na identifica??o da lateralidade: uma an?lise eletrofisiol?gica

Souza, Rafaela Faustino Lacerda de 28 April 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-29T19:39:00Z No. of bitstreams: 1 RafaelaFaustinoLacerdaDeSouza_DISSERT.pdf: 5684674 bytes, checksum: 3dacbe77213824eafb322509b6e0ab0c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-09-03T00:18:23Z (GMT) No. of bitstreams: 1 RafaelaFaustinoLacerdaDeSouza_DISSERT.pdf: 5684674 bytes, checksum: 3dacbe77213824eafb322509b6e0ab0c (MD5) / Made available in DSpace on 2016-09-03T00:18:23Z (GMT). No. of bitstreams: 1 RafaelaFaustinoLacerdaDeSouza_DISSERT.pdf: 5684674 bytes, checksum: 3dacbe77213824eafb322509b6e0ab0c (MD5) Previous issue date: 2016-04-28 / Estudos recentes t?m demonstrado que o reconhecimento da lateralidade de m?os em uma perspectiva de segunda pessoa engaja processos de imag?tica motora. No entanto, pouco se sabe sobre a atividade e contribui??o das regi?es sens?rio-motoras corticais nesse processo. O objetivo do presente estudo ? mostrar como a rota??o mental de est?mulos visuais de partes do corpo influenciam o processamento neural dessas regi?es atrav?s da modula??o da atividade oscilat?ria de grupos neuronais nas faixas alfa e beta. Para tanto, realizamos a an?lise da perturba??o espectral relacionada ao evento (ERSP) do registro eletroencefalogr?fico (EEG) de 20 sujeitos engajados no reconhecimento da lateralidade de m?os apresentadas em uma tela de computador. Os resultados mostram que a supress?o da amplitude das frequ?ncias alfa e beta foi maior nas regi?es sens?rio-motoras e que caracter?sticas do est?mulo (como orienta??o da m?o, vis?o, postura de dedos e lateralidade) s?o capazes de modular esses componentes oscilat?rios em diferentes regi?es, sugerindo etapas distintas para o processamento da tarefa cognitiva. / Recent studies demonstrated that during third-person handedness recognition the subject engages motor imagery processes. However, little is known about the functional aspects of sensorimotor regions? participation in this process. The present study aims to show how motor imagery of body parts during handedness judgment influences neural processing in these regions by modulating the oscillatory behavior of neuronal populations in both the alpha and beta frequencies. Therefore, we analyzed the event-related spectral perturbation of electroencephalography (EEG) recordings of 20 subjects engaged in handedness recognition of stimuli presented on a computer screen. The results revealed the supression of both alpha and beta EEG amplitude on sensorimotor regions and that characteristics of the stimulus (such as hand orientation, vision, posture fingers and laterality) were able to modulate these oscilatory components in distinct regions, suggesting different stages of task processing.

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