How does turning the head help a person locate a sound?

Turning the head is a natural behavior that assists in spatial localization by allowing a person to face the source of a sound directly.

Under normal conditions, the brain determines the direction of a sound by analyzing minute differences in the time of arrival and the intensity of the sound waves reaching each ear. For instance, a sound arriving at the right ear slightly sooner or with greater intensity than at the left ear is perceived as originating from the right.1

By turning the head to face the sound source, a person effectively cancels these differences in time and intensity between the two ears. This action helps the listener pinpoint the source more accurately, as the sound waves then reach both ears simultaneously and with equal intensity. This process relies on the brain's ability to compare signals from both ears, a function facilitated by bilateral neural interconnections in the brainstem and midbrain.12