Abstract
A number of researchers have employed the minimum audible angle (MAA) paradigm to investigate the precision with which listeners can discriminate differences of sound-source location in the free field [A. W. Mills, J. Acoust. Soc. Am. 30, 237–246 (1958); W. M. Hartmann and B. Rakerd, ibid. 85, 2031–2041 (1989)]. Surprisingly, this has been done only for binaural listening conditions, although Man’s capacity for monaural localization is well documented [J. R. Angell and W. Fite, Psych. Rev. 8, 225–246 (1901); R. A. Butler, R. A. Humanski, and A. D. Musicant, Perception 19, 241–256 (1990)]. In the present study, monaural and binaural MAAs were determined using a broadband stimulus for seven virtual sound-source positions in the horizontal plane. Listeners indicated via a three-alternative, forced-choice paradigm whether the stimulus presented in the second interval appeared to move clockwise, counterclockwise, or not at all, with respect to that presented in the first interval. Results will be discussed in terms of data obtained in previous studies of binaural MAA, and compared with data on monaural and binaural localization acuity.
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