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In the following study we wish to explore factors determining emotional arousal patterns in a performance situation. The level of electrodermal activity (EDA) shows the activity of the sympathetic nervous system, and thus, the actual level of emotional arousal. Although most studies consider EDA constant across the body, recent evidence points out that lateral differences exist: level of arousal may be different on the dermatomes due to effects of several underlying factors (see the Multiple Arousal Theory for further details, e.g. Picard et al., 2016). Our prior results confirmed that fear and sadness conveyed by short musical segments shows right sided laterality (Kasos et al., 2020). Another research group used an experimental setup with stress inducing Stroop test measurements (Svetlák et al., 2013) and found increased EDA on the right phalanges while performing the verbal color-naming Stroop task, as compared to rest periods. We collected electrodermal activity (EDA) data from the left and right wrists of right handed participants while playing Tetris. We assume that during the course of the game emotional arousal increases in most subjects due to the rising cognitive demand dictated by the task: shorter and shorter time-intervals are allowed for successful completion of turning the shapes in an optimal way as the stack of objects build up. We also assume that laterality will increase towards the end of the game. We expect a considerable individual difference in both level and laterality, as well as real-time changes of these indices; partly explained by state and trait stress characteristics and performance outcome.