Which two cues are complementary for binaural localization?

Which two cues are complementary for binaural localization?

• A. Interaural Time Difference and Interaural Level Difference
• B. Frequency and amplitude
• C. Spectral peaks and notch cues
• D. Head movement and pinnae cues

Answer: (A)

Binaural localization relies on comparing the sound arriving at each ear. The two main cues involved are the interaural time difference (the slight difference in when a sound reaches the two ears) and the interaural level difference (the difference in sound pressure level between the ears). These cues complement each other because they carry information across different frequency ranges. Low-frequency sounds have wavelengths larger than the head, so the timing difference is the most reliable cue for determining direction. High-frequency sounds are more affected by the head shadow, producing a noticeable level difference that becomes the dominant cue. Together, ITD and ILD allow the auditory system to localize sounds across a broad range of frequencies, especially for horizontal (azimuth) localization. While spectral cues from the outer ear and dynamic cues from head movements can aid localization, the primary binaural information for where a sound is coming from in the horizontal plane is provided by ITD and ILD.

Binaural localization relies on comparing the sound arriving at each ear. The two main cues involved are the interaural time difference (the slight difference in when a sound reaches the two ears) and the interaural level difference (the difference in sound pressure level between the ears). These cues complement each other because they carry information across different frequency ranges. Low-frequency sounds have wavelengths larger than the head, so the timing difference is the most reliable cue for determining direction. High-frequency sounds are more affected by the head shadow, producing a noticeable level difference that becomes the dominant cue. Together, ITD and ILD allow the auditory system to localize sounds across a broad range of frequencies, especially for horizontal (azimuth) localization. While spectral cues from the outer ear and dynamic cues from head movements can aid localization, the primary binaural information for where a sound is coming from in the horizontal plane is provided by ITD and ILD.