Impact of reward expectation on pupillary change during an adaptive two player card game

Change of reward expectation during a competitive card game was evaluated using pupil responses. In order to simulate interactive play of participants in a poker game, the game process was fully controlled by the computer player. As a result, pupil response based on reward expectation was examined. Also, participant's pupil size dilates in response to the change of reward expectation when the computer player provides some expectation.