In social psychology it is common sense that human behavior is considerably shaped by social influence (e.g., Asch 1956; Tanford and Penrod 1984; Lapinski and Rimal 2005). Yet, as, for example, Asch (1956) points out, there are different types of social influence. Deutsch and Gerard (1955) discuss the separation between normative and informational social influence, a current widespread categorization. Normative social influence leads to behavior that is in conformity with the positive expectations of others, i.e., individuals behave in a certain way because they think that it is expected of them (Deutsch and Gerard 1955). In contrast, informational social influence comprises the fact that individuals accept the information provided by others as correct (Deutsch and Gerard 1955). Thus, in the former case individuals behave in a certain way in order to be accepted as a group member, while in the latter case individuals...
