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dc.contributor.authorHassall, Cameron Dale
dc.date.accessioned2013-08-26T12:09:47Z
dc.date.available2013-08-26T12:09:47Z
dc.date.issued2013-08-26
dc.identifier.urihttp://hdl.handle.net/10222/36240
dc.description.abstractReal-world decision making is challenging due, in part, to changes in the underlying reward structure: the best option last week may be less rewarding today. Determining the best response is even more challenging when feedback validity is low. Presented here are the results of two experiments designed to determine the degree to which midbrain reward processing is responsible for detecting reward contingency changes when feedback validity is low. These results suggest that while midbrain reward systems may be involved in detecting unexpected uncertainty in non-stationary environments, other systems are likely involved when feedback validity is low – namely, the locus-coeruleus-norepinephrine system. Finally, a computational model that combines these systems is described and tested. Taken together, these results downplay the role of the midbrain reward system when feedback validity is low, and highlight the importance of the locus-coeruleus-norepinephrine system in detecting reward contingency changes.en_US
dc.language.isoenen_US
dc.subjectlearningen_US
dc.subjectdecision makingen_US
dc.subjectmachine learningen_US
dc.subjectcomputational neuroscienceen_US
dc.subjectelectroencephalography (EEG)en_US
dc.subjectneuroimagingen_US
dc.titleLearning in Non-Stationary Environmentsen_US
dc.date.defence2013-08-12
dc.contributor.departmentDepartment of Psychology and Neuroscienceen_US
dc.contributor.degreeMaster of Scienceen_US
dc.contributor.external-examinerPatricia McMullenen_US
dc.contributor.graduate-coordinatorSimon Sherryen_US
dc.contributor.thesis-readerAaron Newmanen_US
dc.contributor.thesis-readerThomas Trappenbergen_US
dc.contributor.thesis-supervisorOlave Krigolsonen_US
dc.contributor.ethics-approvalReceiveden_US
dc.contributor.manuscriptsNot Applicableen_US
dc.contributor.copyright-releaseNot Applicableen_US
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