Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua

Detalhes bibliográficos
Ano de defesa: 2011
Autor(a) principal: Araujo, Ricardo Rafael de lattes
Orientador(a): Carreiro, Luiz Renato Rodrigues lattes
Banca de defesa: Boggio, Paulo Sérgio lattes, Haddad Junior, Hamilton lattes
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Presbiteriana Mackenzie
Programa de Pós-Graduação: Distúrbios do Desenvolvimento
Departamento: Psicologia
País: BR
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://dspace.mackenzie.br/handle/10899/22471
Resumo: Attention can be understood as a set of neural mechanisms that enhance the processing of relevant information, thoughts or actions while ignoring irrelevant or scattered stimuli. Thus, attention allows the organism to interact in a proper way with the environment. Among the brain structures associated with the control of attention, the Dorsolateral Prefrontal Cortex (DLPFC) has a remarkable role in current literature as a region associated with behavioral control. Transcranial Direct Current Stimulation (TDCS) is based on the application of a low intensity electric current through electrodes placed in the scalp, aimed at modulating the activity of different brain areas. This technique has been used to study brain functions. This study has the objective of verifying how attention can be modulated through the application of bilateral tDCS on DLPFC using measures of reaction time (RT) in tasks of temporal and spatial orientation. To accomplish that, two experiments were planned and executed. In the first one, which focused on the voluntary orienting of spatial attention, each participant had to orient attention to the position indicated by an arrow; in the second, on voluntary orienting of temporal attention, each participant had to orient attention to the most frequent time interval of visual targets. In both cases, participants had to respond as fast as possible when the target was displayed by pressing a joystick key. RTs were registered. The sample was composed of 18 undergraduate students, age range 19-25 years old (12 for the first experiment and 6 more for the second). In each experiment, subjects were submitted to three tDCS conditions (anodal, cathodal and sham) on the DLPFC during the undertaking of tests. Analyses of variance were made, in order to compare the involved factors. For the experiment of spatial orientation, the anodal condition produced lower RTs, when compared to sham. For the temporal orienting experiment it was observed that, in the anodal modulation, RTs were increased for the less frequent interval (500 ms), indicating that the anodal tDCS can have influenced in a more effective way attentional orienting to the most frequent intervals. Therefore it is possible to postulate the existence of a facilitating effect of anodal tDCS in the modulation of DLPFC, which generated an impact in attentional orienting, lowering RTs to the valid condition (spatial) when compared to sham tDCS.
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spelling 2016-03-15T19:39:42Z2020-03-19T15:19:51Z2011-06-292020-03-19T15:19:51Z2011-02-25http://dspace.mackenzie.br/handle/10899/22471Attention can be understood as a set of neural mechanisms that enhance the processing of relevant information, thoughts or actions while ignoring irrelevant or scattered stimuli. Thus, attention allows the organism to interact in a proper way with the environment. Among the brain structures associated with the control of attention, the Dorsolateral Prefrontal Cortex (DLPFC) has a remarkable role in current literature as a region associated with behavioral control. Transcranial Direct Current Stimulation (TDCS) is based on the application of a low intensity electric current through electrodes placed in the scalp, aimed at modulating the activity of different brain areas. This technique has been used to study brain functions. This study has the objective of verifying how attention can be modulated through the application of bilateral tDCS on DLPFC using measures of reaction time (RT) in tasks of temporal and spatial orientation. To accomplish that, two experiments were planned and executed. In the first one, which focused on the voluntary orienting of spatial attention, each participant had to orient attention to the position indicated by an arrow; in the second, on voluntary orienting of temporal attention, each participant had to orient attention to the most frequent time interval of visual targets. In both cases, participants had to respond as fast as possible when the target was displayed by pressing a joystick key. RTs were registered. The sample was composed of 18 undergraduate students, age range 19-25 years old (12 for the first experiment and 6 more for the second). In each experiment, subjects were submitted to three tDCS conditions (anodal, cathodal and sham) on the DLPFC during the undertaking of tests. Analyses of variance were made, in order to compare the involved factors. For the experiment of spatial orientation, the anodal condition produced lower RTs, when compared to sham. For the temporal orienting experiment it was observed that, in the anodal modulation, RTs were increased for the less frequent interval (500 ms), indicating that the anodal tDCS can have influenced in a more effective way attentional orienting to the most frequent intervals. Therefore it is possible to postulate the existence of a facilitating effect of anodal tDCS in the modulation of DLPFC, which generated an impact in attentional orienting, lowering RTs to the valid condition (spatial) when compared to sham tDCS.A atenção pode ser compreendida como um conjunto de mecanismos neurais que facilitam o processamento de informações, pensamentos ou ações relevantes enquanto ignoram outros irrelevantes ou dispersos. Deste modo a atenção permite que o organismo interaja de maneira adequada com o ambiente. Dentre as estruturas cerebrais associados ao controle da atenção, o Córtex Prefrontal Dorsolateral (CPFDL) tem tomado papel de destaque na literatura atual como uma região associada ao controle comportamental. A Estimulação Transcraniana por Corrente Contínua (ETCC) se baseia na aplicação de corrente elétrica de baixa intensidade por meio de eletrodos posicionados no escalpe com o objetivo de modular a atividade de diferentes regiões cerebrais e tem sido utilizada como modo de estudo da função cerebral. Esse trabalho tem como objetivo verificar como a atenção pode ser modulada a partir da aplicação ETCC bilateral sobre o CPFDL, utilizando medidas de tempo de reação (TR) em tarefas de orientação temporal e espacial. Para Tanto foram planejados e executados dois experimentos. No primeiro experimento, relativo à orientação voluntária da atenção espacial, cada participante deveria orientar a atenção para a posição do espaço indicada por uma seta. O segundo experimento, relativo à orientação voluntária da atenção temporal, cada participante deveria orientar a atenção para o intervalo temporal de maior recorrência. Em ambos os casos os participantes deveriam responder o mais rapidamente possível ao aparecimento do alvo pressionado uma tecla de joystick registrando-se assim o seu TR. Participaram desse estudo 18 alunos de graduação (12 no primeiro desenho experimental, e para o segundo desenho experimental foram adicionados mais 6 colaboradores) na faixa etária de 19 à 25 anos. A cada sessão os colaboradores deveriam responder a ambos os experimento enquanto eram submetidos a diferentes polaridades de ETCC (anódica, catódica e placebo) sobre o CPFDL. Foram feitas análises de variância para comparar os fatores estudados. No experimento de orientação espacial a condição anódica produziu TR menores em comparação à condição placebo. No caso do experimento de orientação temporal foi observado que na modulação anódica houve um aumento nos TR no intervalo menos recorrente de 500 ms, indicando que a ETCC anódica pode ter influenciado de modo mais efetivo o direcionamento atencional aos intervalos mais freqüentes. Neste sentido é possível sugerir a existência de um efeito facilitatório da ETCC anódica na moducalçao do CPFDL, o que gerou um impacto no direcionamento atencional, diminuindo os TR para a condição valida (orientação espacial) quando comparados a ETCC placebo.Fundo Mackenzie de Pesquisaapplication/pdfporUniversidade Presbiteriana MackenzieDistúrbios do DesenvolvimentoUPMBRPsicologiaCPFDL (Córtex Prefrontal Dorsolateral)atençãoETCC (Estimulação Transcraniana por Corrente Contínua)DLPFC (Dorsolateral Prefrontal Cortex)attentionTDCS (Transcranial Direct Current Stimulation)CNPQ::CIENCIAS HUMANAS::PSICOLOGIAModulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínuainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisCarreiro, Luiz Renato Rodrigueshttp://lattes.cnpq.br/0203967709311323Boggio, Paulo Sérgiohttp://lattes.cnpq.br/0659408656635728Haddad Junior, Hamiltonhttp://lattes.cnpq.br/2916820411141675http://lattes.cnpq.br/9194619138637630Araujo, Ricardo Rafael dehttp://tede.mackenzie.br/jspui/retrieve/3654/Ricardo%20Rafael%20de%20Araujo.pdf.jpghttp://tede.mackenzie.br/jspui/bitstream/tede/1548/1/Ricardo%20Rafael%20de%20Araujo.pdfinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do Mackenzieinstname:Universidade Presbiteriana Mackenzie (MACKENZIE)instacron:MACKENZIE10899/224712020-03-19 12:19:51.227Biblioteca Digital de Teses e Dissertaçõeshttp://tede.mackenzie.br/jspui/PRI
dc.title.por.fl_str_mv Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
title Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
spellingShingle Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
Araujo, Ricardo Rafael de
CPFDL (Córtex Prefrontal Dorsolateral)
atenção
ETCC (Estimulação Transcraniana por Corrente Contínua)
DLPFC (Dorsolateral Prefrontal Cortex)
attention
TDCS (Transcranial Direct Current Stimulation)
CNPQ::CIENCIAS HUMANAS::PSICOLOGIA
title_short Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
title_full Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
title_fullStr Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
title_full_unstemmed Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
title_sort Modulação da orientação temporal e espacial da atenção por meio de estimulação transcraniana por corrente contínua
author Araujo, Ricardo Rafael de
author_facet Araujo, Ricardo Rafael de
author_role author
dc.contributor.advisor1.fl_str_mv Carreiro, Luiz Renato Rodrigues
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/0203967709311323
dc.contributor.referee1.fl_str_mv Boggio, Paulo Sérgio
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/0659408656635728
dc.contributor.referee2.fl_str_mv Haddad Junior, Hamilton
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/2916820411141675
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/9194619138637630
dc.contributor.author.fl_str_mv Araujo, Ricardo Rafael de
contributor_str_mv Carreiro, Luiz Renato Rodrigues
Boggio, Paulo Sérgio
Haddad Junior, Hamilton
dc.subject.por.fl_str_mv CPFDL (Córtex Prefrontal Dorsolateral)
atenção
ETCC (Estimulação Transcraniana por Corrente Contínua)
topic CPFDL (Córtex Prefrontal Dorsolateral)
atenção
ETCC (Estimulação Transcraniana por Corrente Contínua)
DLPFC (Dorsolateral Prefrontal Cortex)
attention
TDCS (Transcranial Direct Current Stimulation)
CNPQ::CIENCIAS HUMANAS::PSICOLOGIA
dc.subject.eng.fl_str_mv DLPFC (Dorsolateral Prefrontal Cortex)
attention
TDCS (Transcranial Direct Current Stimulation)
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS HUMANAS::PSICOLOGIA
description Attention can be understood as a set of neural mechanisms that enhance the processing of relevant information, thoughts or actions while ignoring irrelevant or scattered stimuli. Thus, attention allows the organism to interact in a proper way with the environment. Among the brain structures associated with the control of attention, the Dorsolateral Prefrontal Cortex (DLPFC) has a remarkable role in current literature as a region associated with behavioral control. Transcranial Direct Current Stimulation (TDCS) is based on the application of a low intensity electric current through electrodes placed in the scalp, aimed at modulating the activity of different brain areas. This technique has been used to study brain functions. This study has the objective of verifying how attention can be modulated through the application of bilateral tDCS on DLPFC using measures of reaction time (RT) in tasks of temporal and spatial orientation. To accomplish that, two experiments were planned and executed. In the first one, which focused on the voluntary orienting of spatial attention, each participant had to orient attention to the position indicated by an arrow; in the second, on voluntary orienting of temporal attention, each participant had to orient attention to the most frequent time interval of visual targets. In both cases, participants had to respond as fast as possible when the target was displayed by pressing a joystick key. RTs were registered. The sample was composed of 18 undergraduate students, age range 19-25 years old (12 for the first experiment and 6 more for the second). In each experiment, subjects were submitted to three tDCS conditions (anodal, cathodal and sham) on the DLPFC during the undertaking of tests. Analyses of variance were made, in order to compare the involved factors. For the experiment of spatial orientation, the anodal condition produced lower RTs, when compared to sham. For the temporal orienting experiment it was observed that, in the anodal modulation, RTs were increased for the less frequent interval (500 ms), indicating that the anodal tDCS can have influenced in a more effective way attentional orienting to the most frequent intervals. Therefore it is possible to postulate the existence of a facilitating effect of anodal tDCS in the modulation of DLPFC, which generated an impact in attentional orienting, lowering RTs to the valid condition (spatial) when compared to sham tDCS.
publishDate 2011
dc.date.available.fl_str_mv 2011-06-29
2020-03-19T15:19:51Z
dc.date.issued.fl_str_mv 2011-02-25
dc.date.accessioned.fl_str_mv 2016-03-15T19:39:42Z
2020-03-19T15:19:51Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dspace.mackenzie.br/handle/10899/22471
url http://dspace.mackenzie.br/handle/10899/22471
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dc.publisher.none.fl_str_mv Universidade Presbiteriana Mackenzie
dc.publisher.program.fl_str_mv Distúrbios do Desenvolvimento
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dc.publisher.country.fl_str_mv BR
dc.publisher.department.fl_str_mv Psicologia
publisher.none.fl_str_mv Universidade Presbiteriana Mackenzie
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