The apparent radial movement (approaching or receding) of Risset tones was studied for sources in front, above, and to the right of listeners. Besides regular Risset tones, two kinds of spatialization were included: global (regarding the tone as a whole) and individual (spatializing each of its spectral components). The results suggest that regardless of the direction of the glissando, subjects tend to judge them as approaching. The effect of spatialization type was complex: For upward Risset tones, judgements were, in general, aligned with the direction of the spatialization, but this was not observed in the downward Risset tones. Furthermore, individual spatialization yielded judgements comparable to those of non-spatialized stimuli, whereas spatializing the stimuli as a whole yielded judgments more aligned with the treatment.
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