Fear appeal is a term used in psychology, sociology and marketing. It generally describes a strategy for motivating people to take a particular action, endorse a particular policy, or buy a particular product, by arousing fear. A well-known example in television advertising was a commercial employing the musical jingle: "Never pick up a stranger, pick up Prestone anti-freeze." This was accompanied by images of shadowy strangers (hitchhikers) who would presumably do one harm if picked up. The commercial's main appeal was not to the positive features of Prestone anti-freeze, but to the fear of what a "strange" brand might do.
A fear appeal is a persuasive message that attempts to arouse fear in order to divert behavior through the threat of impending danger or harm. It presents a risk, presents the vulnerability to the risk, and then may, or may not suggest a form of protective action.

It is assumed that through a fear appeal the perception of threatening stimuli creates fear arousal. The state of fear is believed to be an unpleasant emotional state that involves physiological arousal that motivates cognitive, affective, and behavioral responses directed towards alleviating the threat or reducing fear. There are many different theoretical models of fear appeal messages. They include: the extended parallel process model, the drive theory, the subjective expected utility theory, the protection motivation theory, the health belief model, the theory of reasoned action, and the transtheoretical model. These models are widely used in substance abuse campaigns, sexual health programs, and many other general health contexts. The persuasive effect of fear appeals is thought to be influenced by several factors such as individual characteristics, self-efficacy, perception of norms, fear strength, perceived threat, perception of treatment efficacy, and defense mechanisms. Mixed results have been produced from studies that attempt to demonstrate the effectiveness of fear appeals for behavior modification, and a recent meta-analysis recommended caution in the use of fear appeals.

Models
Over the last half century, a substantial amount of research has been done on the influence of fear on persuasion. A multitude of theories and models of fear appeals, also known as cognitive mediating processes, have been derived from this research. The goal of each of these has been to conceptualize the influence of fear on persuasion so as to better understand how to employ it in addressing the public on a number of social issues.

Extended parallel process model
The extended parallel process model (EPPM) is a theory that explains how cognitive and emotional mechanisms trigger distinct motivational and coping responses such as fear control and danger control responses. Fear control responses minimize fear through emotional coping that generates reassurance through denial of the threat or derogation of the persuasive message. Fear control is a process of denial that does not involve physically averting behavior to the perceived threat. Danger control is a cognitive process also oriented towards reducing the presented threat. However, unlike fear control response, danger control response may prompt protective action. Thus according to the extended parallel process model, the experience of fear is considered an emotional reaction, and the perceptions of threat are a set of cognitions. The extended parallel process model differs from many other fear appeal arguments because it suggests that fear arousal and danger control processes are distinct processes where fear arousal need not precede the danger control process that underpin precautionary behaviors.
It is predicted that a fear appeal will initiate a dominant response of either fear control or danger control processes. The extended parallel process model concludes that cognitions (attitudes, intentions, and behavior changes) result in fear appeal success via the danger control process. It also concludes that fear appeals fail when the fear emotion is reduced via the fear control process.
Defensive avoidance is an example of a fear control response that leads to the failure of fear appeals.
Drive theory
Emotional tension is a key characteristic of drive theory. According to the theory, a threat that portrays the negative consequences of non-compliance to a recommended behavior is expected to create fear. In order to relieve the emotional tension of the threat, the "drive" state motivates behavior conduct that reduces the tension. According to the drive theory, it is expected that the greater the fear, the greater the compliance to message recommendations.





