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This article provides empirical evidence against the claims that voice is a privative feature and that word-internal devoicing can occur in a language without word-final devoicing. The study of voice patterns in a number of languages shows that the feature value – voice although it is the unmarked value of the laryngeal feature voice, can be active phonologically in a fashion parallel to the marked value + voice. Across languages, voice assimilation may occur independently of devoicing and, although it normally affects both +voice and – voice, it may affect only one value in some languages.
Wetzels et al. (Fri,) studied this question.