Abstract: I use multimodal physiological measurements to examine changes in investor behavior over a series of gains and losses. Specifically, I examine what information more – or- less – sophisticated investors emphasise and characteristics of their associated effort over a series of decision rounds as they choose whether to take a long or short position in a stock. Using eye tracking, I measure where attention is directed. Using GSR, pupillometry, and EEG data, I measure characteristics of the effort expended by investors as they evaluate the information available to them. I find that investors emphasize information that trends in the same direction as the decision they ultimately make. Additionally, overall effort levels are greater when investors make investment decisions under the influence of prior losses. I also document the evidence that suggests the magnitude of the participant’s change in efforts is greater when they go from experiencing gains to looses than from losses to gains.

I provide new insights into the process of investment decision-making and how farming and experience impact that process. This dissertation is one of the first examples in accounting and finance literatures to make extensive use of eye tracking and introduces the use of GSR, pupillometry, and EEG measurements in investment decision-making research.