Presentation
Comparing Static and Dynamic Decision Tasks Using Pupillometry: Expected Loss Is More Important Than Defined Reward
SessionPoster Session 2
DescriptionWe report two experiments that use changes in pupil diameter to explore decision-making. We used a two-player collaborative decision task. In experiment one, participants were shown a static image of the game. In experiment two, participants interacted with a computer agent on this game. The computer was programmed to either cooperate or to work independently on the majority (70%) of turns. The experiments were run using a Tobii Pro Fusion running at 60Hz. For each experiment, 10 participants completed 9 trials. Percentage change in pupil diameter from a baseline (defined by 2 seconds of fixation in empty cells) in experiment one is similar for both targets, suggesting that participants treat low and high rewards equally. In experiment two, when the computer agent is choosing low rewards, there is, again, little change in pupil diameter. When the computer chooses high-rewards, pupil diameter increases significantly when reward is low: t(19 = -2.4, p<0.05. This suggests that when participants expect a high reward, but the computer does not cooperate, this is experienced as loss and pupil diameter increases. Loss is more important than reward for decision-making (as Prospect Theory proposes) and becomes more concrete when the action of an opponent is visible.
Alternate Presenter
Event Type
Poster
TimeWednesday, October 15th5:30pm - 6:30pm CDT
LocationRiverside East