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Functional aspects of colour processing within the human brain

dc.contributor.advisorBinsted, Gordonen_US
dc.contributor.committeeMemberSpink, Kevin S.en_US
dc.contributor.committeeMemberSaucier, Deborah M.en_US
dc.contributor.committeeMemberMaraj, Brianen_US
dc.contributor.committeeMemberChilibeck, Philip D.en_US
dc.creatorGeorgescu, Andreien_US
dc.date.accessioned2006-04-28T13:15:28Zen_US
dc.date.accessioned2013-01-04T04:30:05Z
dc.date.available2006-05-01T08:00:00Zen_US
dc.date.available2013-01-04T04:30:05Z
dc.date.created2006-04en_US
dc.date.issued2006-04-06en_US
dc.date.submittedApril 2006en_US
dc.description.abstractIn a seminal work, Ungerleider and Mishkin (1982) offered substantial evidence that two separate visual pathways – coding what/where-- exist within the primate brain. Recently, human evidence has resulted in the “what/where” pathways being reconsidered in terms of ventral stream (vision for perception) and dorsal stream (vision for action; Goodale & Milner, 1992). Consistently, many studies have demonstrated that there is an overrepresentation of magnocellular (luminance) information within the dorsal stream; parvocellular input (colour, shape, consistancy) represents the primary source of information for the ventral stream. Although luminance contrast is important in perceiving moving objects, colour discrepancies help the visual system to identify the detailed characteristics of the environment and, subsequently, to prepare the motor system for action. This thesis endeavors to determine the role played by colour, in contrast with luminance, in influencing the programming and control movement production. Using a grasping paradigm and two different luminance conditions (iso-luminance vs. heteroluminance) within two separate experiments (experiment 1 – programming; experiment 2 – online control), we show that chromatic information can be successfully be used by motor circuits to complete the grasping task faultlessly. Although significant temporal delays in terms of reaction time and movement time between colour and luminance processing are identified, the human visual system seems able to fully integrate colour features for action with no significant spatial error cost.en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-04282006-131528en_US
dc.language.isoen_USen_US
dc.subjectcolouren_US
dc.subjectvisionen_US
dc.subjectperceptionen_US
dc.subjectluminanceen_US
dc.subjectactionen_US
dc.subjectgraspingen_US
dc.titleFunctional aspects of colour processing within the human brainen_US
dc.type.genreThesisen_US
dc.type.materialtexten_US
thesis.degree.departmentCollege of Kinesiologyen_US
thesis.degree.disciplineCollege of Kinesiologyen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US

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