A continuous 400‐Hz tone (60–75 dB SPL) and 250‐msec bursts of an 800‐Hz tone (10 dB SL) were delivered dichotically. Four out of nine listeners were able to detect a 180° interaural phase shift. When a subaudible continuous 800‐Hz tone was added to the ear with the 400‐Hz tone, interaural phase‐shift detection depended on the phase relation of the added tone to the 400‐Hz tone. These results are shown to be consistent with the hypothesis of aural harmonic distortion.