Fig. 2.

Stimuli of experiment 2 with interaural time contrast. A: in condition 1, there was no interaural time contrast between A and B tones (top). In condition 2, the A and B tones were presented with an interaural time contrast of 600 µs (bottom), inducing an illusion of 180° azimuth contrast between A and B tones and thus an effect of stream segregation due to the perceived separate spatial sources. B: frequency spectrum of the sound envelope and of the cochlear signals obtained using a cochlear channel model of response (displayed as normalized relative to the maximum magnitude within each sequence). Note that, in both conditions, no peaks emerge at contrast frequencies, because interaural time contrasts cannot be processed by cochlear channels.