Technology
Interaural Time Difference
Quick fact
A sound source just 10 centimeters away from one ear will arrive at the other ear about 0.07 milliseconds later.
Why this is interesting
Have you ever noticed that you can tell where a sound is coming from just by listening? It’s not magic—it’s science.
Read the full explanation
Understanding Interaural Time Difference
When a sound comes from one side, it reaches your closer ear slightly before the farther one. This tiny time difference helps your brain figure out where the sound is coming from in space.
A deeper explanation
The interaural time difference (ITD) is the key mechanism behind our ability to localize sounds. Since sound travels at about 343 meters per second, a small shift in distance creates a measurable delay in arrival times between ears. The brain uses this timing cue to estimate the direction of the sound source.