What makes a scream scary?

On Halloween, NPR ran a short piece on something I think about more than I probably should: what makes a horror movie scream actually work.

It starts with Brian De Palma's 1981 film Blow Out, where John Travolta plays a horror movie sound designer. His director hears the actress's scream and isn't happy, so off he goes on a mission to record a better one. Anyone who has spent hours hunting for the right sound will feel that one.

So what is a good scream? Neuroscientist David Poeppel from NYU told NPR that most people would say it's loud and a bit higher than normal, "but that's really not right." It's the particular acoustic structure. The quality is called roughness, a kind of fast, rattling flutter in the sound, and the more of it there is, the more alarming it feels.

Music cognition expert Caitlyn Trevor explained why. When we scream, we push our vocal cords past what they usually do, and that sends a very clear signal: this is important, this is real. She says horror composers, whether they know it or not, imitate this by pushing their instruments past their usual limits. Psycho is the famous example, and you can hear it in Hereditary and Midsommar too.

I like her other point as well. We react differently to art than to real life. A scream in a film can raise the hair on your neck, but some part of us knows we're safe.

For me, this is the beauty of sound design. Often you know a sound is right long before you can say why. It's lovely that researchers are still asking those questions, and that a good scream can still teach us something about how we listen.

Source: NPR, "The art and science of a scream" by Michelle Aslam (31 Oct 2026), https://www.npr.org/2026/10/31/nx-s1-6008161/the-art-and-science-of-a-scream

Takeaway: A scary scream isn't about volume; it's the rough, strained edge in the sound that our brains read as real alarm.