This paper mainly deals with the relationship between citizens' levels of news exposure and their behaviors toward the president's corruption scandal in South Korea. In particular, we examine how an individual's level of news exposure affected his/her level of political information about the corruption scandal, perception of then President Park Geun-hye's responsibility for corruption, and participation in anti-Park protests or counter-protests. In this paper, we argue that more exposure to consistent news reports of the president's corruption increases the amount of information citizens with different political dispositions have in common. The more their sets of political information overlap, the closer their perceptions and behavioral choices regarding a corruption scandal are likely to be.

This preregistered study uses a combination of physiological measures to explore both the activation and reduction components of cognitive dissonance theory. More precisely, we use skin conductance to identify dissonance arousal, a short-term affective response to counter-attitudinal stimuli, and then use heart rate variability to measure dissonance reduction, which reflects longer-term patterns of emotional regulation and information processing. Our preliminary tests find weak evidence of dissonance arousal and no evidence of dissonance reduction using this physiological approach. We consequently reconsider (albeit optimistically) the use of physiology in future work on cognitive dissonance. We also discuss the implications of our findings for selective exposure and motivated reasoning.