Abstract
When all the components of a complex tone share a common interaural time delay (ITD), a single component can be made to perceptually segregate from the complex by shifting its ITD to a unique value. Segregation of different components in succession can evoke the perception of a melody [Kubovy et al., Science 186, 272–274]. A series of five experiments demonstrated that (1) the ITD transition is more responsible for the segregation effect than the uniqueness of the ITD of the segregated component, (2) independent change in ITD of one component relative to coherent change among the other components is not sufficient to cause segregation, (3) cyclic modulation of ITD causes segregation which is independent of modulation rate, (4) temporal gaps in the stimulus of the order of 100 ms, and centered on the ITD transitions, can prevent segregation. These findings are consistent with an explanation based on sensitivity to within-channel reductions in interaural correlation within a sliding temporal window of around 100-ms duration; when different ITDs are temporally juxtaposed within a time frame of around 100 ms, these ITDs are encompassed by the window’s span and the wave forms within it do not correlate perfectly at either delay.
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