The Cave Whisperers:

How Sound May Have Dragged Our Ancestors’ Eyes Around

by Randy Thom

Have you ever been in a space that just… performs? I’m not talking metaphorically. I mean a tunnel that eats your whisper and spits it back at you from three directions, or a canyon that flings your shout back like it’s saying, “Nice try, pal.” If you work with sound, you know that feeling: the room suddenly becomes a collaborator. It’s one of the great joys of the job!

But here’s the part that’s honestly mind-blowing: our prehistoric ancestors figured this trick out long before we had recording studios or digital reverb plugins. They were onto this 15,000 years ago, possibly 50,000 years ago, and according to this relatively new field called archaeoacoustics, they didn’t just appreciate a good echo; they followed it.

The Echo Hunters

Decades ago, a researcher named Iegor Reznikoff walked into famous painted caves in France, like Niaux and Arcy-sur-Cure, and did the simplest thing a sound person can do: he made a sound. He hummed. He shouted. He listened closely.

And what he found was wild: the places in the caves that really “talked back”—the spots with those long, velvety decays and strong echoes—were the exact spots where the prehistoric paintings clustered. Not just some of them, but the vast majority!

In Niaux’s famous Salon Noir, you can let out a yell and get a seven-second tail on it. That’s more reverb than you get in some cathedrals! And guess what? That’s where all the stunning bison and horses appear. It’s almost like the cave was an audible beacon, saying, “Psst, artist, over here! This is the stage!”

Mapping the Resonance

More recently, a team led by Fazenda took this idea into Spanish caves, but with serious 21st-century gear. They mapped the acoustic “fingerprints” of several painted caves, measuring everything from how frequencies behave to the decay curves (called impulse responses).

Their findings were a strong echo of Reznikoff’s: certain visual motifs appeared to be magnetically drawn to areas with unusual resonance or strong reflection [1]. It’s the auditory equivalent of a perfect shot that just wants to be framed a certain way—you can feel the pull.

The Singing Cliffs

This pattern isn’t limited to dark, deep caves, either. Open-air rock art shows the same thing. In Spain’s La Valltorta Gorge, archaeologists compared the acoustics of decorated rock shelters to the plain, undecorated ones. The decorated ones “sang back” more [2]. Stand in the right spot and clap your hands, and the canyon claps right along with you!

The rock artists apparently loved that sonic performance. So, they painted where the sound performed best. You can almost picture them rehearsing: “Try a clap right here—ah, yes, perfect! Let’s paint that antelope here.”

Sound: The Parent of Vision

What all this tells me is that the usual sensory hierarchy we take for granted—the one where we think we see first and hear second—wasn’t always the rule. Sometimes, maybe a lot of the time, sound is the parent, and vision is the kid tagging along.

In fact, cognitive researchers like Miyagawa have even suggested a more radical idea: that these echo-rich environments didn’t just influence where people painted, but that the powerful acoustic feedback nudged humans toward making visual symbols in the first place [3]. The sound gave them a profound, sensory feeling, and the painting became a way to hold onto that fleeting acoustic experience.

When I work on a film, I’m constantly trying to get people to understand that sound isn’t just decoration or “the frosting.” It should be part of the cake, and written very specifically into the script! Sound fundamentally changes how we visually perceive the world in front of us. The prehistoric artists already knew this truth: they weren’t decorating quiet places—they were decorating responsive ones. They weren’t just painting scenes; they were painting acoustic experiences.

It’s a reminder I always come back to: if we really want to understand a place—or a film, or a character in a film — we shouldn’t just look. We should let sound help guide where we look.

Citations & Further Reading

[1] Fazenda, B., P. Till, L. F. De Oliveira. (2017). “Acoustic measurements of prehistoric painted caves: Evidence of deliberate choices based on acoustics.” The Journal of the Acoustical Society of America, 142(3), 1332–1341.

[2] Díaz-Andreu, M., I. Fazenda, J. E. L. S. G. P. Fazenda, P. T. L. T. P. A. S. L. T. C. (2018). “Acoustic-visual relationships in open-air rock art sites: a case study in La Valltorta, Spain.” Journal of Archaeological Science: Reports, 17, 345–354.

[3] Miyagawa, S. (2012). “The Integral Sign as a Visual Symbol of Sound in the Upper Paleolithic Cave Paintings.”Origins of Language, 1–25.

Thanks to Walter Murch for inspiring this article!

Check out his new book “Suddenly Something Clicked.”l