The aftereffects of continuously and discontinuously approaching sound images were studied. Moving images were formed using sequences of wideband noise pulses with linear amplitude modulation delivered via two loudspeakers located in an anechoic chamber at distances of 1.1 and 4.5 m from the subject. Adaptation to continuous approach evoked a change in the perception of continuously moving sound sources, while adaptation to discontinuous approach altered the perception of discontinuously moving sources. Aftereffects did not arise when the adaptation and test stimuli had different movement qualities. Regardless of movement quality (discontinuous or continuous), when the rhythmic structure of the adaptation and test stimuli were the same, aftereffects were stronger than when their rhythmic structures were different. These results suggest that the pathways processing information on continuously and discontinuously moving sound sources are different.
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