UC Berkeley Phonology Lab Annual Report (2015) Phonetic Sources of Morphological Patterns in Sound Change: Fricative Voicing in Athabascan Jonathan Manker University of California, Berkeley While most modern Athabascan languages are described as having contrastive voicing in fricatives, the patterns of fricative voicing still follow both transparent and sometimes more complex morphological (as well as phonological) environments. While a synchronic analysis of the language seems to demonstrate a direct connection between phonological patterns and morphology, such an analysis may also suggest the possibility of morphological conditions in sound change, which has been proposed by some (Crowley 1997, Donohue 2005). This paper investigates the development of fricative voicing in two Athabascan languages and demonstrates that purely phonetic conditions can be identified that led to what appears to be a case of a morphologically conditioned sound change, following a similar analysis in Blevins & Lynch (2009). Both class-specific affixation and prominence patterns are shown to provide phonetic environments that may result in synchronic phonological patterns following morphological environments. 1. Introduction Early models of linguistic organization suggest the impossibility that non-phonetic factors (morphosyntax, semantics, etc.) can influence sound change. For example, the Neogrammarians proposed that sound change is a “purely phonetic process,” occurring under “strictly phonetic conditions” (Bloomfield 1933:364, concerning the Neogrammarians). The American structuralists (Hockett 1942, Trager & Smith 1951) similarly proposed that different levels of linguistic organization, such as phonetics, morphology, and syntax, were considered to be autonomous modules, and thus phonetic properties could not be influenced by factors such as part of speech, grammatical function, or semantic class. Opposition to these claims existed throughout the first half of the 20 th century despite their seemingly widespread acceptance. For example, Sapir