Two synthetic speech syllables, differing in pitch, were presented over one loudspeaker situated at one of the following azimuths: 0° (in front of the subject); 45°, 90°, and 135° to the left or to the right; and 180°. The subject's task was to report the high-pitch syllable. The pattern of performance can be described in terms of two component effects: a decreasing anterior—posterior gradient, and right-side advantage. Competition between messages from one direction only appears to be as effective in determining auditory spatial effects as competition between spatially distinct sources.
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