According to some psychiatrists, the modern horror film serves many of the same function for the adolescence that the fairy tale serves for the young child, for instance to warn off evil in familiar places. Horror films are designed to elicit strong emotional reactions from viewers, including fear and dread; and this they do, Nearly everyone reports having been disturbed at some time by an image from a film or television program,

According to Professor Glenn Sparks, one reason for the appeal is how you feel after the movie. This is called the excitation transfer process. Spark's research found that when people watch frightening films, their heart rate, blood pressure and respiration increases.

After the film is over, this physiological arousal lingers, Sparks said. That means that any positive emotion you experience - like having fun with friends - are intensified, he said. Instead of focusing on the fright you felt during the film, you recall having a great time and you'll want to come back for more.

However, if your experience was negative, you might not. For instance, let's say you were on a date that wasn't going well or you got into a car accident on your way home, Sparks said. Again, because your lingering arousal heightens any emotions you experience, the negative feeling might sway you to skip a scary film in the future.

Some people are simply wired to enjoy high levels of physiological arousal, Sparks said. According to the literature, he said about 10& of the population enjoys the adrenaline rush.

Similarly, wiring may explain why other hate horror films. Specifically, some individuals have harder time screening their unwanted stimuli in their environment, Sparks said. For instance, they might be hypersensitive to the temperature in a room or the tag on their shirt. These same individuals are more likely to have intense philological reactions to horror films.

Research suggests that more men enjoy horror films. This might be because men are socialised to be brave and enjoy threatening things. Men may derive social gratification from not letting horror film bother them, Sparks said, It's the idea of mastering something threatening, he said.

"Men often like horror films as date films because women are more likely to seek physical closeness when they're scared, and men can show off their strength and bravery," Cantor said. (This is referred to as the cuddle effect)

In one study males like a horror film more when they saw it with a female who was scared, and females liked the film more when they saw it with a male who wasn't scared.

Parents need to be especially careful about what their children watch, according to both experts. Cantor's research found that college student who watched horror film or programs before 14 years old, had trouble sleeping and felt anxious about typically safe activities or stopped engaging in the altogether.

"Until the age of 5 to 7, seeing is believing," said Cantor, who wrote the book 'Teddy's TV Troubles' specifically for calming down children after they've been scared by the media.

Even if it's 'make-believe', she said, it's still scary for young children. For older children, realistic threats, such as kidnappings and child molestation are scary, she said. Teens, like adults are more scared over abstract threat, such as disease and the supernatural, she said.

In a biological sense fear is related to death. For the human organism all emotions can be said to be reaction to what Jeffrey Gray calls 'reinforcing event,' i.e. rewards and punishments, or the removal of such rewards and punishments. A fearful response is an indication that the perceiver believes that his well-being is in danger, and that he is threatened by death or injury that can lead to death indirectly.

Biologically fear is a warning signal that death, injury or destruction is imminent and it is designed to cause the perceiver to avoid the dangerous situation. Fear, psychologically, is also a warning and it basically functions to prevent the possibility of personality disintegration. A victim of fear perceives a threat to his identity which he experience as a loss of control. According to Arno Karlen it is "a traditional Western fear that any loss of individual or social control will start a snowballing loss of controls in general" and such an effect in itself is sufficient to arouse more fear and complicate the situation for the victim. That is if fear is capable of generating more fear and a victim of fear can find himself in a nightmare of his own making is he allows his imagination to get out of hand and does not successfully gain control on the situation.