A major contributor to our ability to analyze music and recognize instruments is the concept known as ‘timbre’. Timbre is a hard-to-quantify concept loosely defined as everything in music that isn’t duration, loudness or pitch. For instance, timbre comes into play when we are able to instantly decide whether a sound is coming from a violin or a piano.

The researchers at The John Hopkins University set out to develop a mathematical model that would simulate how the brain works when it receives auditory signals, how it looks for specific features and whether something is there that allows the brain to discern these different qualities.

The researchers asked 20 people to listen to two sounds played by different musical instruments. The listeners were then asked to rate how similar the sounds seemed. A violin and a cello are perceived as closer to each other than a violin and a flute. The researchers also found that wind and percussive instruments tend to overall be the most different from each other, followed by strings and percussions, then strings and winds. These subtle judgments of timbre quality were also reproduced by the computer model.