Auditory Motion Aftereffect 1 Perception and Psychophysics. Vol. 62(5), pp. 1099–1111. Suggested running head: AUDITORY MOTION AFTEREFFECT The Auditory Motion Aftereffect: its Tuning and Specificity in the Spatial and Frequency Domains

In this paper, the auditory motion aftereffect (aMAE) was studied by using real moving sound as both the adapting and test stimulus. The real moving sound was generated by a loudspeaker mounted on a robot arm which was able to move quietly in three dimensional space. Seven subjects with normal hearing were tested. Results from Experiment 1 showed a robust and reliable negative aMAE in all the subjects involved. After listening to a sound source moving repeatedly to the right, a stationary sound source was perceived to be moving to the left. The magnitude of the aMAE tended to increase up to the highest velocity tested (<30°/sec). The tuning and specificity of this aftereffect was further studied in the spatial and frequency domains. The strength of the aftereffect depended on matching both the spatial location and the frequency content of the adapting and test stimuli. Offsetting the locations of adapting and test stimuli by 20° reduced the size of the effect by about 50%. A similar decline occurred when the frequency of the adapting and test stimuli differed by one octave