Why We Love Scary Movies (cont.)

Defenders of these movies may say they're just harmless entertainment. But if their attraction is powerful, Cantor says, so is their impact. These impacts are felt by adults as well as children, by the well-adjusted as well as the disturbed. They may linger well after the house lights go up -- sometimes for years. And they may be anything but pleasurable.

Scary Movies: The Fear Is Real

So is the fear you feel when you watch someone being chased by an axe-wielding murderer any different from the fear you might feel if you were actually being chased by an axe-wielding murderer?

The answer is no, at least not from where Glenn Sparks sits. Sparks, a professor of communication at Perdue University, studies the effects of horror films on viewers' physiology. When people watch horrific images, their heartbeat increases as much as 15 beats per minute, Sparks tells WebMD. Their palms sweat, their skin temperature drops several degrees, their muscles tense, and their blood pressure spikes.

"The brain hasn't really adapted to the new technology [of movies]," Sparks explains. "We can tell ourselves the images on the screen are not real, but emotionally our brain reacts as if they are ... our 'old brain' still governs our reactions."

When Sparks studied the physical effects of violent movies on young men, he noticed a strange pattern: The more fear they felt, the more they claimed to enjoy the movie. Why? Sparks believes scary movies may be one of the last vestiges of the tribal rite of passage.

"There's a motivation males have in our culture to master threatening situations," Sparks says. "It goes back to the initiation rites of our tribal ancestors, where the entrance to manhood was associated with hardship. We've lost that in modern society, and we may have found ways to replace it in our entertainment preferences."

In this context, Sparks says, the gorier the movie, the more justified the young man feels in boasting that he endured it. Other examples of modern tribal rites include roller coasters and even frat-house hazing.

Morbid Fascination

There are other theories to explain the appeal of scary movies. James B. Weaver III, PhD, says many young people may be attracted to them merely because adults frown on them. For adults, morbid curiosity may be at play -- the same kind that causes us to stare at crashes on the highway, suggests Cantor. Humans may have an innate need to stay aware of dangers in our environment, especially the kind that could do us bodily harm, she says.

Yet another theory suggests that people may seek out violent entertainment as a way of coping with actual fears or violence. Sparks points to a study that showed that shortly after the murder of a college student in a community, interest in a movie showing a cold-blooded murder increased, both among women in the student's dormitory and in the community at large.