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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2009.tde-02042009-114350
Document
Author
Full name
Luana Lira Righi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Valle, Luiz Eduardo Ribeiro do (President)
Kihara, Alexandre Hiroaki
Teixeira, Luis Augusto
Title in Portuguese
Assimetria interlateral da atenção visuoespacial automática em tarefas de discriminação de forma e de localização.
Keywords in Portuguese
Assimetria
Atenção visual
Discriminação visual
Tempo de reação
Abstract in Portuguese
Há evidências de que a orientação da atenção para o lado direito seria mais eficiente do que para o esquerdo. Outros trabalhos mostram uma assimetria quanto às vias visuais. A via ventral, que realiza processamento de objetos, seria mais ativa no hemisfério esquerdo e a via dorsal, que realiza a localização de estímulos, seria mais ativa no hemisfério direito. A interação entre essas assimetrias foi investigada. Realizamos dois experimentos nos quais a atenção automática dos sujeitos foi mobilizada através do aparecimento de um estímulo visual periférico. O Experimento 1 foi uma tarefa de discriminação de forma, envolvendo a via ventral. O Experimento 2 foi de discriminação de local, envolvendo a via dorsal. Esperávamos a manifestação de uma assimetria comportamental para o lado direito apenas no Experimento 1. No entanto isto ocorreu nos dois experimentos, ou seja, assimetria foi para o lado em que a atenção é preferencialmente mobilizada. O que sugere que o fator determinante para essa manifestação é a assimetria atencional, mas não assimetria das vias visuais.
Title in English
Interlateral asymmetry of visuospatial automatic attention in shape discrimination and location discrimination tasks.
Keywords in English
Asymmetry
Reaction time
Visual attention
Visual discrimination
Abstract in English
Recent studies have shown that attention orienting to the right side is more efficient than attention orienting to the left side. Other studies have shown that the two hemispheres process visual stimuli differently: the ventral visual pathway, which processes object shape, is more active in the left hemisphere, while the dorsal visual pathway, which processes object location, is more active in the right hemisphere. This work investigated theses asymmetries. Automatic attention was mobilized by a peripheral visual prime stimulus in two experiments. In Experiment 1 a task requiring shape discrimination was used. It was expected a strong bias to the right side. In Experiment 2 a task requiring location discrimination was used. It was expected now a much smaller bias to the right side. A strong bias to the right side was found in the two experiments. This bias was probably due to the attentional bias to the right side. Interhemispheric sensory asymmetries apparently were not strong enough to influence behavior in the present experimental conditions.
 
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Publishing Date
2009-05-13
 
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