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Title page for ETD etd-07262007-090547


Type of Document Master's Thesis
Author Essex, Brian George
Author's Email Address brian.essex@vanderbilt.edu
URN etd-07262007-090547
Title A Near Infrared Spectroscopy Study of Counterfactual Thinking
Degree Master of Arts
Department Psychology
Advisory Committee
Advisor Name Title
Sohee Park Committee Chair
David H. Zald Committee Member
Keywords
  • Brain -- Imaging
  • prefrontal cortex
  • counterfactual thinking
  • mental simulation
  • nirs
  • Near infrared spectroscopy
Date of Defense 2007-05-29
Availability unrestricted
Abstract
This thesis describes a study on counterfactual thinking, which refers to the ability to imagine scenarios that are contrary to fact. I investigated the neural correlates of realistic and unrealistic past counterfactual thoughts in bilateral regions of the frontal cortex with Near Infrared Spectroscopy. It was found that individuals take longer to make decisions about unrealistic counterfactual thoughts than realistic counterfactual thoughts and unrealistic causal thoughts. There were no differences in levels of most extreme percent change in hemoglobin for counterfactual and causal thoughts. Unrealistic thoughts corresponded to higher percent change maximums of oxygenated hemoglobin than realistic thoughts in the left hemisphere, but lower percent change maximums of oxygenated hemoglobin in the right hemisphere. Neural activity unique to counterfactual thinking does not appear to lie in the dorsolateral prefrontal cortex. However, the frontal cortex appears to play a role in differentiating realistic and unrealistic thinking.
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