Over the years, movie-makers have tried to go beyond what’s on the screen to scare theatergoers. In the 1950s, director William Castle startled those viewing his horror films, notably The Tingler, with gimmicks like vibrators installed under some theater seats. When the creature escapes into a theater in the movie, Vincent Price’s voice warns the viewers that the Tingler is loose and tells them to scream. At this moment, the theater projectionist would activate buzzers under the seats of a few people in the audience, often eliciting the desired screams.

Smell-O-Vision was another attempt to go beyond the screen by inducing odors at appropriate points, but technical flaws ruined its 1960 debut and it was abandoned. Infrasound, very low frequency audio which humans don’t consciously perceive, has been used in movies to amplify audience fear.

While we haven’t seen 1950s-style panic-inducing creativity lately, neuroscience may be close to giving today’s directors an even more powerful tool: […]