binaural effect

The binaural effect refers to how the brain processes sound from two ears to perceive location and other sound characteristics. Each ear converts sound into electrical impulses, which then mix in the brain. This separation allows for the perception of differences in pitch between the ears, known as diplacusis, and can lead to binaural beats when tones are presented separately to each ear.

The brain uses phase differences between the signals from both ears to determine the lateral location of a sound source. At low frequencies, the phase difference is key. However, at high frequencies, the head's "sound shadow" creates an intensity difference, which becomes the primary cue for localization. While the brain can analyze complex sounds like speech and music, the precise mechanisms are still being studied. The combined input from both ears is more effective than a single ear for distinguishing sounds in noisy environments.1