Simultaneous Streaming


Auditory scene analysis requires the process of simultaneous streaming to determine which combination of components from several sound sources belong together. Simultaneous streaming takes acoustic inputs that occur at the same time, but at different places in the auditory scene, and treats them as properties of a single sound (see Figure 1.12). This process is more likely to occur when sound components follow Gestalt grouping rules of similarity, symmetry, common fate, and proximity (Bregman, 1990).

Example of simultaneous streaming using three tones (taken from Bregman & Ahad, 1995, p.48).
When the frequency separation between tones A and B is large, A segregates from B allowing B to fuse with C.
 When A and B are close in frequency, they fuse together to form one pure-tone stream, breaking the tendency of B to fuse with C,
 thereby excluding C into a second stream.


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