Specifically, the female speech could be readily extracted by simply focusing on the rows of the correlation matrix corresponding to the female pitch (shaded yellow in Fig. This idea is implemented to segregate the two-talker mixture in Fig. Note that in such a model, the attentional focus is essential to bring out the stream, and without it the correlation matrix remains unused.
Basically, this row is an approximation of the eigenvector of the correlation matrix and can be used as “mask” to assign the channels to the different streams (rightmost panel). When attention is directed to a particular channel (e.g., yellow arrow to tone B), the entries in the correlation matrix along the row of the selected channel can readily point to all the other channels that are highly correlated and hence may bind with it. To explain how this process may occur, we consider the simpler two-tone stimulus in Fig. 59.1) results in binding the pitch with all other voice attributes in the foreground stream while relegating the rest of the concurrent sounds to the background. But it is intuitively clear that attending selectively to a specific feature such as the pitch of a voice (symbolized by the yellow-shaded pitch region in Fig. It remains uncertain if the representation of streams in the brain requires attention or is simply modulated by it (Carlyon et al.
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