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Effect of Minimizing Spatial Separation and Melodic Variations in Simultaneously Presented Two-Syllable Words

This study will examine two important factors for the conception Auditory Streaming defined by Bregman, pitch and localization. By removing one or two of these factors as possible identifiers to separate sound sources, the importance of each of them and the effect of reducing both of them will be studied. Stimuli with combinations of two-syllable words will be presented simultaneously in speakers to subjects and the number of correct identifications will be measured. In one category of stimuli speech melody will be removed and replaced with a monotonous pitch, equal for all words. One category will have all words presented from one speaker only. A significant effect was found for pitch as a factor for successful segregation of words. Conclusions will be related to earlier studies and common theories, the Cocktail party effect among others.

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