Rayleigh first proposed ILDs code high frequencies and ITDs code low frequencies

Evidence

Lord Rayleigh (aka John William Strutt ) first proposed the idea that the ability to localize sound was driven by two primary acoustic cues: difference in level between the two ears (interaural level difference; ILD) and the difference in arrival time of a sound between two ears (interaural time difference; ITD). Rayleigh suggested that ILDs were used for high-frequency sound localization and ITDs were used for low-frequency sound localization. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1451

Categorization

• DEFINE: Defines the two fundamental binaural cues, ILD and ITD, and a named origin (duplex theory of localization).