Intuitive knowledge of object acoustics enables perceptual separation of physical variables from impact sounds
When two objects collide, you can hear what they're made of and how heavy they are, even though the sound blends contributions from both. We recorded the acoustic "fingerprints" of hundreds of everyday objects, built a generative model from their statistics, and used it to synthesize controlled collisions. Listeners judged these properties accurately. But when both objects varied, their judgments got worse whenever the synthetic resonances departed from real-world statistics. The brain appears to carry an internal model of how objects sound, and it uses that model to split a sound into its physical causes.