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This study attempted to verify the relationship between perceived stress and affective instability in people in their twenties. Two groups were formed based on the perceived stress score, and participants' emotional changes were measured using the experience sampling method. Based on the two-dimensional model of emotion, affective variability, emotional inertia, and affective instability values were calculated for each group to clearly identify the relationship between perceived stress and affective instability. First, compared to the non-stress group, the stress group showed significantly higher levels of valence variability and quality variability, but no significant difference in arousal variability or intensity variability. Second, there were no significant differences in valence or arousal inertia between groups. Finally, the stress group had significantly higher valence affective instability than the non-stress group, but there was no significant difference in arousal affective instability between the two groups.
