Humans perceive interaural level differences at frequencies where plane waves produce none

Evidence

An apparent inconsistency in spatial hearing is the fact that although plane waves cause an ILD only at high frequencies, humans are sensitive to ILDs at all frequencies. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1442

Categorization

• QUESTION: The chapter then explains two functions for low-frequency ILD sensing (distance and coherence) - worth understanding which of these dominates in real listening conditions.