Headphones allow separating interaural phase from interaural time delay

Evidence

One advantage of using headphones pertains particularly to the ability to represent the IPD separately from the ITD. Manipulating interaural phase without manipulating the interaural time delay is not easily done in the free field, but is very straightforward when testing over headphones. In one of these experiments, Yost (1974) measured the just noticeable interaural phase difference (IPD) as a function of stimulus frequency and reference IPD. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1515