There is a moment most people recognize but rarely think about. A chord resolves unexpectedly and something happens in the chest. A bass line drops and the stomach responds before the brain has formed a conscious reaction. A melody from years ago comes back and the body knows it before the mind catches up.
These aren't metaphors. They're physiology. And researchers at the University of Tokyo have now mapped them with a precision that changes how we understand what music actually is.
The Study
Associate Professor Tatsuya Daikoku and his colleagues at the University of Tokyo asked 527 participants to listen to eight different chord progressions, each varying in predictability and surprise, while marking on a body diagram where they felt physical sensations. The results were specific enough to be surprising.
Certain chord progressions sparked sensations in the heart while others were felt more in the stomach. Those sensations were also associated with a person's aesthetic appreciation and positive feelings about the chords they'd heard. The research found that uncertainty and surprise in music play an important role in eliciting those bodily sensations and emotional responses.
The mapping wasn't random. Predictable chord sequences produced sensations of calm, relief, and nostalgia, felt primarily in the chest and upper body. Unexpected harmonic turns, the musical moments that register as surprise, produced stronger reactions in the heart and abdomen.
What This Tells Us About Listening
"Music is not just something we listen to with our ears; it's an experience felt throughout the entire body. I think this full-body sensation is what truly defines music," said Daikoku.
That statement is more radical than it sounds. For most of the history of recorded music, the entire system of delivery has been designed around the ears. Headphones, speakers, acoustics, mixing, all of it optimized for auditory experience while the rest of the body receives whatever vibration happens to pass through the room.
What the University of Tokyo research confirms is that the body has its own relationship with music that runs parallel to the auditory one. The chest response to a chord resolution, the stomach drop at harmonic surprise, these aren't side effects of listening. They're part of the experience itself, and they've been largely excluded from how music is delivered.
The Prediction Mechanism
The deeper finding in this research concerns how the brain processes musical expectation. The researchers found that prediction and uncertainty affect heart and abdominal sensations specifically. When music follows an expected path, the nervous system settles into a regulated state. When it departs from expectation, the body registers the departure physically before conscious recognition occurs.
This is the same predictive processing mechanism that underlies the nervous system's response to all kinds of sensory input. The brain generates predictions about what's coming next, and the body responds to the gap between prediction and reality. Music, it turns out, is an unusually direct way of modulating that mechanism, which is why it has been used for emotional regulation across virtually every human culture.
What's new is the specificity. Knowing that surprise-heavy harmonic movement produces stomach sensations while predictable progressions settle into the chest gives composers, sound designers, and wellness practitioners a more precise vocabulary for understanding what music does to the people experiencing it.
Why Full-Body Experience Changes the Equation
Researchers describe moments of being moved by music as evoking intensely embodied sensations: a swelling in the chest, a quickened heartbeat, or a sudden stillness that floods the entire body. These experiences are difficult to articulate, yet they are vividly real and spatially anchored.
The phrase "spatially anchored" is key. The physical experience of music has a location. It happens somewhere in the body, and different music happens in different places. That spatial quality is what gets lost when music is delivered only to the ears, and it's what gets restored when the full body is part of the experience.
The research doesn't prescribe a particular technology or delivery mechanism. But it makes a clear case that optimizing music for the ears alone is an incomplete approach to what music actually is. The chest that responds to a chord resolution, the stomach that registers surprise before the mind processes it, those aren't peripheral to the experience. According to the data, they may be where the most significant parts of it live.
