Thresholds for apparent auditory motion induced by linearly changing interaural time differences
C. M. Brandauer, Wayne Ward · The Journal of the Acoustical Society of America · 1976
That listening dichotically to two waveforms differing slightly in frequency produces an image that appears to move from one ear to the other is well known [e.g., Lord Rayleigh (J. W. Strutt), Philos. Mag. Ser. 6 13, 214–232 (1907)]. We have determined the thresholds for apparent auditory movement using low-pass-filtered pulse trains by changing the interaural time difference T by an increment t with each dichotic pulse pair. Two major experimental paradigms were used with several pulse repetition rates and initial values of T. In the first paradigm, t, a measure of movement rate, was the independent variable and N, the number of pulse pairs or movement time required for the movement threshold was determined. The second paradigm reversed the roles of t and N, thus yielding the required movement rate for a given movement time.