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This study examined three ways that perception of non-native phones may be uncategorized relative to native (L1) categories: focalized (predominantly similar to a single L1 category), clustered (similar to > 2 L1 categories), and dispersed (not similar to any L1 categories). In an online study, Egyptian Arabic speakers residing in Egypt categorized and rated all Australian English vowels. Evidence was found to support focalized, clustered, and dispersed uncategorized assimilations. Second-language (L2) category formation for uncategorized assimilations is predicted to depend upon the degree of perceptual overlap between the sets of L1 categories listeners use in assimilating each phone within an L2 contrast.
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