Figure 9.

Model performance after modification of parameters. (a) Omitting the multiscale analysis: The model (without the scale analysis) is simulated using alternating vowels ∕e∕ and ∕ə∕ [shown in Fig. 7b]. A time-frequency spectrogram is presented to the incomplete model and leads to the entire stream being grouped as one cluster (shown above) and an empty second cluster. The two top rightmost panels depict the time-frequency marginals reflecting the energy in each cluster. Below: A tonotopic view of the two vowels (obtained from two cross sections of the spectrogram at different time instances) reveals a great overlap in the spectral region occupied by both phonemes. The right panels show a multiscale view of both phonemes and reveal the different timbre structures that emerge from the multiple scale filters. (b) Varying the cortical dynamics: The three panels show results of segregation of alternating two tones with varying dynamic ranges for the cortical filters. The white contours are all boundaries reflecting a 25% threshold of streaming. The leftmost panel is a replica of Fig. 6.