Minimum audible angles in the horizontal and vertical planes: Effects of stimulus onset asynchrony and burst duration

The effects of burst duration and stimulus onset asynchrony (SOA, the onset-onset time difference) on the minimum audible angle (MAA) were measured in the horizontal and vertical planes using high-pass noise bursts. Four listeners were tested with two burst durations (10 and 50 ms) and five SOAs (25, 50, 100, 200, and 400 ms), using an adaptive paradigm. In both planes, MAAs were lowest at burst duration = 50 ms, and the MAAs decreased exponentially with SOA. Although the effect of burst duration was generally larger in the vertical plane than in the horizontal plane, the plane of presentation did not affect the relationship between SOA and MAA. (C) 2000 Acoustical Society of America. [S0001-4966(00)04612-9].