Electrophysiological indices of feedback processing
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Date
2010
Authors
Christie, Gregory J
University of Lethbridge. Faculty of Arts and Science
Journal Title
Journal ISSN
Volume Title
Publisher
Lethbridge, Alta. : University of Lethbridge, Dept. of Neuroscience, 2010
Abstract
All sentient organisms use contextual information to assess the amount of reward associated
with a particular behavior. Human beings have arguably evolved the most sophisticated of these
mechanisms and are capable of integrating information over a long duration of time to
accurately assess the expected outcome of a chosen action. This thesis used
electroencephalography (EEG) to measure how the human brain processes rewarding and
punishing feedback in a gambling-type game with variable risk and reward. Experiment 1
determined that phase-locked (evoked) and non-phase-locked (induced) electroencephalographic
activity share only partially overlapping generators in human mediofrontal cortex. Experiment 2
determined that the magnitude of certain evoked EEG components during reward processing
tracked subsequent changes in bets placed in the next round. These results extend the body of
literature by assessing the overlap between induced and evoked EEG components and the role
of evoked activity in affecting future decision making.
Description
xii, 76 leaves : ill. (chiefly col.) ; 29 cm
Keywords
Motivation (Psychology) -- Physiological aspects , Reward (Psychology) , Feedback (Psychology) , Electroencephalography , Decision making , Dissertations, Academic