Interaural phase discrimination is finest at midline and low frequencies

Evidence

Yost’s data showed small JNDs for IPD when the frequency was low and smaller JNDs for the reference angles closest to midline. … The JND for IPD was about 3° when the sound was simulated to be at the front (the 0° condition). The JND for IPD was fairly constant for frequencies below 1000 Hz. … Simulating sounds at different spatial locations led to higher just noticeable IPDs. This finding follows the same results we obtained in the free-field sound localization experiments, with midline performance being the best. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1518