sound localization
Quick Summary
Sound localization is the ability of the brain to identify the origin of a sound. This process relies on comparing the sound signals received by both ears.
At low frequencies, the brain uses the phase difference between the sound waves reaching each ear to determine direction. However, at high frequencies, the head creates a "sound shadow," making the intensity difference of the sound at each ear more important for localization. The spectral shape of sounds also plays a role in determining elevation.
The brainstem and midbrain are involved in these comparisons. While the exact mechanisms are still being studied, the ability to process these subtle differences allows us to pinpoint sound sources, even in noisy environments, a phenomenon related to the "cocktail party effect".12
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