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Neural mechanisms of position perception
Descriptive
TitleInfo
Title
Neural mechanisms of position perception
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Wright
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Jessica
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Jessica Wright
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author
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Delgado
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Mauricio
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Mauricio Delgado
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Advisory Committee
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chair
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Krekelberg
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Bart Krekelberg
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internal member
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Benasich
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April
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April Benasich
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Advisory Committee
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internal member
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Pang
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Kevin
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Kevin Pang
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Advisory Committee
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internal member
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Whitney
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David
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David Whitney
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Advisory Committee
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Rutgers University
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Graduate School - Newark
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Text
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theses
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ETD doctoral
OriginInfo
DateCreated
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2014
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2014-10
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2014
Place
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xx
Language
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eng
Abstract
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Visual perception is a reconstruction of the physical visual aspects of the world and subject to various biases, assumptions and noise. One aspect of visual perception is visuospatial localization. Although visual localization is typically accurate, there are various situations where healthy human subjects mislocalize objects, as well as, neurological disorders that alter visual localization behavior. These situations result in differences between the perceived and actual position of an object. These perceptual errors are useful to explore the limitations of visuospatial object localization and provide information on the underlying neural mechanisms of position perception. In particular, the following studies investigated how the brain integrates visual information across a spatially extended stimulus and ultimately results in a final percept of position. This project utilized behavioral and fMRI studies combined with transcranial direct current stimulation (tDCS) in healthy human subjects. These methods allowed us to quantify behavioral errors in localization and examine changes in the BOLD signal (as an indirect measure of changes in neural activity) in potential neural correlates of position perception. In Aim 1 we show that factors such as retinal eccentricity and attentional cues bias localization behavior via alterations of the contribution of specific object components in the integration process. Aim 2 shows that tDCS over posterior parietal cortex (PPC) yields mislocalizations that are consistent with predictions from the interhemispheric competition theory (ICT) of attention. This supports the causal role of PPC in visual spatial localization. Aim 3 extends the results from Aim 2 to show that the BOLD signal changes in PPC predict localization behavior. In addition to novel insights related to position perception, these experiments provide insight into the effects of tDCS on behavior and the interaction of tDCS with the BOLD signal. This work begins to answer how different factors influence position perception and the role of different cortical regions in position perception. This research also has implications for rehabilitation programs for patients with various visual neurological disorders that alter spatial perception.
Subject
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Topic
Neuroscience
Subject
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Topic
Visual perception
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Rutgers University Electronic Theses and Dissertations
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ETD
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Title
Graduate School - Newark Electronic Theses and Dissertations
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rucore10002600001
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ETD_5856
Identifier
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doi:10.7282/T34Q7WNH
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (xvi, 167 p. : ill.)
Note
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Ph.D.
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Includes bibliographical references
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Includes vita
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by Jessica Wright
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NjNbRU
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Rights
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The author owns the copyright to this work.
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Wright
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Jessica
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Type
Permission or license
DateTime
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2014-09-27 17:29:35
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Name
Jessica Wright
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Affiliation
Rutgers University. Graduate School - Newark
AssociatedObject
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License
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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Technical
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ETD
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windows xp
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