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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2014.tde-19022015-153614
Document
Author
Full name
José Thales Sena Rebouças
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Ranvaud, Ronald Dennis Paul Kenneth Clive (President)
Gualtieri, Mirella
Kogler Junior, Joao Eduardo
Ramos, Renato Teodoro
Silva, Jose Aparecido Da
Title in Portuguese
Evolução no tempo da percepção visual de distância.
Keywords in Portuguese
Estereoscopia
Realidade virtual
Tempo de reação
Visão
Visão binocular
Abstract in Portuguese
O desenvolvimento da realidade virtual permitiu experimentos psicofísicos inéditos, como o aqui descrito, cujo objetivo foi investigar a microgênese da percepção visual de profundidade decorrente de disparidade binocular. Tais processos ocorrem em etapas, com construção gradual do percepto. Experimentos já indicavam a percepção da profundidade em etapas precoces do processamento visual. Isso é confirmado neste trabalho, realizado com tecnologia que garante a estimulação visual exclusivamente por disparidade binocular. Para isso, foram desenvolvidos hardware e software específicos que permitem o controle preciso dos tempos de estimulação binocular e a medida confiável de tempos de reação. Resultado significativo deste trabalho foi também a validação dessas ferramentas, possibilitando estudos futuros de psicofísica em realidade virtual. Finalmente, são sugeridas as cautelas necessárias em experimentos dessa natureza, tanto para a proteção dos participantes contra condições desconfortáveis ou aversivas, como para a seleção de participantes sem déficits funcionais de estereopsia.
Title in English
Time evolution of visual perception of distance.
Keywords in English
Binocular vision
Reaction time
Stereoscopy
Virtual reality
Vision
Abstract in English
Virtual reality technology opened up the possibility of novel psychophysiscal investigations. This work describes a research on the microgenesis of depth perception, as induced exclusively by binocular disparity. Such processes occur in early stages, whereby the percept is gradually built. Previous experiments indicated that depth perception is perceived in early stages of visual processing. This conclusion is now confirmed by the present work, carried out with a technology that guarantees visual stimulation exclusively by binocular disparity. Specific hardware and software were developed, to permit accurate timing of binocular stimulation and reliable measurements of reaction time. A significant result of the present work was the validation of these new tools. Finally, the results also allow suggesting the precautions necessary in the execution of experiments of this type, both to protect participants from possibly uncomfortable or aversive situations, and also to select participants without functional stereopsis deficits.
 
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Publishing Date
2015-02-20
 
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