Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-22T19:24:32Z No. of bitstreams: 1 FelipeSantosDeOliveira_TESE.pdf: 1841785 bytes, checksum: 66bb047469f843d38674d96acaa05fd9 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-23T20:33:27Z (GMT) No. of bitstreams: 1 FelipeSantosDeOliveira_TESE.pdf: 1841785 bytes, checksum: 66bb047469f843d38674d96acaa05fd9 (MD5) / Made available in DSpace on 2016-03-23T20:33:27Z (GMT). No. of bitstreams: 1 FelipeSantosDeOliveira_TESE.pdf: 1841785 bytes, checksum: 66bb047469f843d38674d96acaa05fd9 (MD5) Previous issue date: 2014-08-27 / A percep??o temporal ? fundamental para a adapta??o ambiental em humanos e outras esp?- cies.O processamento temporal nos organismos, se desenvolveu atrav?s de diferentes sistemas neurais, cada qual respons?vel pelo processamento de diferentes escalas de tempo. Dentre as escalas mais estudadas,est? a que abrange o arranjo de segundos a minutos. Evid?ncias sugerem que o c?rtex pr?-frontal dorsolateral (CPFDL) possui rela??o com a percep??o do tempo na escala de segundos. No entanto, n?o se sabe se o d?ficit de percep??o temporal em pacientes com les?es cerebrais ou mesmo ?les?es revers?veis? causadas por estimula??o magn?tica transcraniana (EMT) nessa regi?o, sejam por perturba??es de outros processos cognitivos (como aten??o e mem?ria de trabalho) ou da percep??o do tempo propriamente dita. Estudos tamb?m relacionam a regi?o do CPFDL na regula??o emocional e especificamente no julgamento e a antecipa??o emocional. Diante disto, nosso objetivo foi estudar o papel do c?rtex pr?-frontal dorsolateral na percep??o de intervalos de tempo de est?mulos neutros e emocionalmente ativos, a partir dos efeitos da modula??o cortical atrav?s da estimula??o transcraniana por corrente cont?nua (ETCC), atrav?s da excita??o (corrente an?dica), inibi??o (corrente cat?dica) e o controle (sham), utilizando os intervalos de 4 e 8 segundos. Nossos resultados mostraram que h? uma subestimativa quando a figura ? apresentada por 8 segundos.Com a corrente an?dica no CPFDL direito ocorre uma subestimativa e com a corrente cat?dica no CPFDL esquerdo h? uma superestimava na reprodu??o do tempo com figuras neutras. Com figuras negativas, a corrente cat?dica sobre o CPFDL esquerdo ocasiona efeito inverso ao de figuras neutras, havendo subestimativa de tempo. O uso de figuras com val?ncia positiva ou negativa, melhoraram as estimativas para 8 segundas e o uso de figuras com val?ncia positiva inibem o efeito da ETCC no CPFDL na estimativa de tempo para 4 segundos. Com esse trabalho podemos concluir que o CPFDL tem um papel fundamental na percep??o de tempo e corresponde em grande parte aos est?gios de mem?ria e decis?o no modelo de rel?gio interno, que o hemisf?rio esquerdo participa na percep??o de tempo tanto em contextos neutros como emocionalmente ativos, Podemos concluir tamb?m que a ETCC e um m?todo eficaz para estudar as fun??es corticais na percep??o de tempo em termos de causa e efeito. / The time perception is critical for environmental adaptation in humans and other species. The temporal processing, has evolved through different neural systems, each responsible for processing different time scales. Among the most studied scales is that spans the arrangement of seconds to minutes. Evidence suggests that the dorsolateral prefrontal (DLPFC) cortex has relationship with the time perception scale of seconds. However, it is unclear whether the deficit of time perception in patients with brain injuries or even "reversible lesions" caused by transcranial magnetic stimulation (TMS) in this region, whether by disruption of other cognitive processes (such as attention and working memory) or the time perception itself. Studies also link the region of DLPFC in emotional regulation and specifically the judgment and emotional anticipation. Given this, our objective was to study the role of the dorsolateral prefrontal cortex in the time perception intervals of active and emotionally neutral stimuli, from the effects of cortical modulation by transcranial direct current stimulation (tDCS), through the cortical excitation (anodic current), inhibition (cathode current) and control (sham) using the ranges of 4 and 8 seconds. Our results showed that there is an underestimation when the picture was presented by 8 seconds, with the anodic current in the right DLPFC, there is an underestimation and with cathodic current in the left DLPFC, there is an overestimation of the time reproduction with neutral ones. The cathodic current over the left DLPFC leads to an inverse effect of neutral ones, an underestimation of time with negative pictures. Positive or negative pictures improved estimates for 8 second and positive pictures inhibited the effect of tDCS in DLPFC in estimating time to 4 seconds. With this work, we conclude that the DLPFC plays a key role in the o time perception and largely corresponds to the stages of memory and decision on the internal clock model. The left hemisphere participates in the perception of time in both active and emotionally neutral contexts, and we can conclude that the ETCC and an effective method to study the cortical functions in the time perception in terms of cause and effect.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T23:10:09Z No. of bitstreams: 1 EmmersonAguilarDeOliveira_DISSERT.pdf: 1117634 bytes, checksum: 8659537b25de5f7bc93023f3cbfc8dd2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-11T23:00:38Z (GMT) No. of bitstreams: 1 EmmersonAguilarDeOliveira_DISSERT.pdf: 1117634 bytes, checksum: 8659537b25de5f7bc93023f3cbfc8dd2 (MD5) / Made available in DSpace on 2017-04-11T23:00:38Z (GMT). No. of bitstreams: 1 EmmersonAguilarDeOliveira_DISSERT.pdf: 1117634 bytes, checksum: 8659537b25de5f7bc93023f3cbfc8dd2 (MD5) Previous issue date: 2017-02-23 / A pesquisa prop?e reflex?es sobre a percep??o do tempo em diferentes momentos da evolu??o das tecnologias da comunica??o, a saber: (1) per?odo do predom?nio dos jornais, revistas, r?dio e cinema, (2) per?odo de expans?o da televis?o no Brasil e (3) per?odo que compreende a expans?o do uso da internet e do surgimento das transmiss?es via sat?lite. Discute, assim, a percep??o do tempo, traduzida pelas pr?ticas sociais associadas ? pressa de tr?s d?cadas distintas: a de 1930, a de 1960 e a de 1990, e a associa??o de uma percep??o acelerada da passagem do tempo com as tecnologias abordadas no trabalho. A base emp?rica do trabalho consiste em nove entrevistas realizadas de acordo com as t?cnicas da Hist?ria Oral, uma proposta te?rico-metodol?gica que agregou novas possibilidades ?s t?cnicas j? conhecidas e largamente aplicadas nas investiga??es conduzidas nas Ci?ncias da Comunica??o, proporcionando novos horizontes, devido ? revaloriza??o de experi?ncias ?nicas e individualizando vozes em um per?odo hist?rico onde a ?globaliza??o? fortalece o conceito de massas. A fundamenta??o te?rica da pesquisa apresenta reflex?es balizadas principalmente por Norval Baitello Junior, Jos? Carlos Meihy, Renato Ortiz, Stephen Bertman e Paul Virilio. A abordagem hermen?utica proposta por Michel de Certeau atuou como base no tratamento das informa??es coletadas nos trabalhos de campo desenvolvidos durante a pesquisa. / This research proposes reflections about the perception of time in different periods of communication technologies evolution, such as: (1) the period of newspapers, magazines, radio and the cinema predominance, (2) the period of the television expansion in Brazil and (3) the period that consists of the expansion of the use of internet and the advent of satellite transmissions. Thus, it discusses the perception of time through the social practices related to hurry of three different generations: the 30's, the 60's and the 90's, and the relation established between an accelerated perception of time and the technologies studied in this dissertation. The empirical basis of the research consists of nine interviews which were held according to the Oral History techniques, a theoretical-methodology proposal that added new possibilities to the already known techniques and are widely applied in researches conducted by the Communication Sciences, providing new horizons, due to the revaluing of single experiences and individualizing voices in a historical period where ?globalization? fortifies the mass concept. The research theoretical foundation shows reflections based specially on Norval Baitello Junior, Jos? Carlos Meihy, Renato Ortiz, Stephen Bertman and Paul Virilio. The hermeneutical approach proposed by Michel de Certeau acted as the basis in the processing of the information collected in the field research developed during the investigation.