Psychological conditions of video gamers were estimated by using chaos analysis of pulse waves. A questionnaire was used to examine the relationship between their psychological conditions and control button operating behavior. Moreover, the process of habituation to simultaneous control button pushing behavior of video gamers over time was analyzed. Pulse waves and frequency/time of controller button operation of students (n=13) playing with “Grand Theft Auto III (GTA)” and “Super Mario Brothers” were measured. The results for GTA indicated that participants who had once played the game, or responded that they enjoyed playing the game had a small relative value of Lyapunov exponent, suggesting that they were playing in relaxed conditions. Males and experienced players frequently operated both the right and left buttons. On the other hand, in “Super Mario Brothers,” the group with a small relative value of Lyapunov exponent frequently operated the left button. Furthermore, the group with a low refreshing score operated the top button, a non- assigned key, and the “A” button, a jump key, more frequently than the group with a high refreshing score. It is suggested that players consciously decreased simultaneous button pushing behavior after the second round of play, because of the learning effect.
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