What is the general principle of binaural localization cues ITD and ILD?

What is the general principle of binaural localization cues ITD and ILD?

• A. Binaural cues are used independently in each ear.
• B. ITD and ILD are complementary cues used across frequency ranges.
• C. Only low frequencies use binaural cues.
• D. Binaural cues rely on spectral content from the cochlea.

Answer: (B)

Binaural localization relies on comparing what reaches the two ears. The two main cues are timing differences (ITD) and level differences (ILD). ITD is the difference in when a sound arrives at each ear and is most informative at low frequencies, where the wavelength is long compared to head size, so small time differences can be detected by coincidence-detecting neurons. ILD is the difference in sound intensity between ears, produced by the head shielding the far ear; this cue becomes strongest at higher frequencies where the head more effectively blocks sound energy. Because each cue varies in reliability across the frequency spectrum, the brain uses them together across frequencies to determine location in space. It's not about cues being used independently per ear, nor about all localization relying only on low frequencies, and while spectral content plays a role, the fundamental principle is interaural timing and level differences guiding perception of where a sound comes from.

Binaural localization relies on comparing what reaches the two ears. The two main cues are timing differences (ITD) and level differences (ILD). ITD is the difference in when a sound arrives at each ear and is most informative at low frequencies, where the wavelength is long compared to head size, so small time differences can be detected by coincidence-detecting neurons. ILD is the difference in sound intensity between ears, produced by the head shielding the far ear; this cue becomes strongest at higher frequencies where the head more effectively blocks sound energy. Because each cue varies in reliability across the frequency spectrum, the brain uses them together across frequencies to determine location in space. It's not about cues being used independently per ear, nor about all localization relying only on low frequencies, and while spectral content plays a role, the fundamental principle is interaural timing and level differences guiding perception of where a sound comes from.