Final answer:
The interaural time difference is a crucial cue for sound localization, particularly for low-frequency sounds, as it determines the azimuth position by comparing sound arrival times between the ears.
Step-by-step explanation:
The interaural time difference cue is used to help with sound localization in the horizontal plane. It relies on comparing the relative time of arrival of sounds at the two ears. Since the ear closer to the sound source will receive the stimulus microseconds before the other ear, it provides an accurate indication of the azimuth position of the sound. Interaural time differences are especially crucial for localizing low-frequency sounds, as high-frequency sounds are better localized using interaural level differences due to their shorter wavelengths. Therefore, the interaural time difference is the most important indicator of a low-frequency sound's azimuth position.