Resolving the projecjion of an occluded stimulus on the human cortical surface

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dc.contributor.advisorSchneider, Keith A
dc.creatorDeSimone, Kevin
dc.date.accessioned2016-08-03T16:51:49Z
dc.date.available2016-08-03T16:51:49Z
dc.date.copyright2013-02
dc.degree.disciplinePsychology
dc.degree.levelMaster's
dc.degree.nameMA - Master of Arts
dc.description.abstractThe human visual system is capable of tracking multiple visual targets under a variety of task constraints and configurations. For nearly two decades, the psychophysical literature has shown that moving, occluded visual targets -- targets that are momentarily invisible as they pass behind an occluding bar -- are differentially represented by the visual system compared to their moving, non-occluded counterparts. Here, I sought to examine the neurophysiological basis of this behavioral difference in response to occluded versus non-occluded visual targets. I used brain imaging to conduct modern retinotopic mapping experiments in human participants. OnceĀ· their early visual cortices were mapped, I was able characterize the neural representations for both targets and distractors as well as during moments of occlusion and non-occlusion. The results show that, using our method, we can distinguish visual targets from distractors; furthermore, there appears to be a representation in retinotopically organized early visual cortex for visual targets that have momentarily disappeared from the visual field due to occlusion.
dc.identifier.urihttp://hdl.handle.net/10315/31707
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subject.keywordsHuman visual system
dc.subject.keywordsOccluded visual targets
dc.subject.keywordsMoving objects
dc.subject.keywordsVisual cortex
dc.subject.keywordsHuman eye
dc.titleResolving the projecjion of an occluded stimulus on the human cortical surface
dc.typeElectronic Thesis or Dissertation

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