Psychological operations (PSYOP) implies a purposeful use of communication by a government or military organization to fulfill its mission and is one understanding of strategic communication. The present study focuses on PSYOP effects. The few studies available on this area indicate that the effects of PSYOP generally tend to be on a minor scale, while PSYOP may have a stronger impact in specific contexts. We discuss possible explanations and suggest that a number of psychological factors inhibit PSYOP success. One major example is that of human cognitive conservatism. Other psychological mechanisms, mostly emotional ones, may promote PSYOP, for example, strong identification with one’s own (national, ethnic or religious) group, a sense of threat to the resources, status and/or survival of own group, a perception of hostility from other groups, and the experience that another group has devalued or offended the in-group.