Beschreibung:
<jats:p>Minimum audible movement angle (MAMA) thresholds were determined for a source producing a broadband noise (500–8000 Hz) moving at a constant angular velocity (20°/s). Nine regions of the field were sampled: 0°, 10°, 20°, 40°, and 80° to the subject's right and left. In agreement with earlier research that employed either static sources or “simulated motion,” acuity was best when the source was at 0° azimuth (1.1°) and poorest at the most lateral position (3.1°–3.5°). The ability to detect motion of a source emitting a broadband noise is clearly superior to performance obtained with tonal signals whether the latter paradigms include “actual” or “simulated” motion. In the more extreme lateral regions of the field, performance was actually better than that previously reported under static localization conditions. Vertical azimuths, ranging from 0°–87.5°, were also examined. Detection of motion was relatively insensitive to this latter parameter. [Work supported by NSF and NIH.]</jats:p>