Influence of Monaural Masking on the Localization of Sound in Space Free

Normally, under conditions of monaural free‐field listening occasioned either by disease or by occlusion of one ear, the apparent source of a sound in space is displaced toward the side of the normal or unoccluded ear. The experiments described indicate that, under some conditions of unilateral auditory masking with pure tones or noise, the apparent source of an auditory signal in space, delivered always at zero azimuth, moves toward the masked ear. The apparent source of the signal could, in these experiments, be varied over a range of 150°, consistent changes in apparent location being produced by changes in the intensity and frequency relations between the signal in space and the masking stimulus.