A0071 Elly VAN GELDEREN Mary WILLIE The Possible Diachrony of Null Objects in Athabascan The Possible Diachrony of Null Objects in Athabascan Like subject pronouns, independent object pronouns can attach to verbs to become dependent heads. They can subsequently be reanalyzed as agreement markers and disappear. This increase and decrease in head marking can be named the Object Cycle. The phenomenon is widely attested in the Afro-Asiatic, Bantu, Dravidian, and Indo-European language families. In most languages this does not lead to object polysynthesis. In this paper, we will first show two pathways that can be the result of object incorporation into the verbal complex and then focus on developments in Athabascan to provide evidence for an increase in object polysynthesis. In Southern Athabascan languages such as Navajo, both subject and object markers are obligatory on verbs, as are pronominal and oblique objects. Northern Athabascan languages such as Ahtna, Slave, and Dogrib display complementary distribution between nominal objects and verbal affixation. Rice (2003: 72) notes that the Southern pattern is an innovation. The trend in the Athabascan languages seems to be towards more object polysynthesis. The most archaic Athabascan languages, Ahtna and Koyukon, have retained noun incorporation, but Navajo, Apache, and the Pacific Coast languages have not. We will ague that, when pronouns are reanalyzed as the bearers of [i-phi] and nominal arguments as adjuncts, the nominals can no longer incorporate. Rice, Keren 2003. Doubling Agreement in Slave. In Andrew Carnie, et al. (eds) Formal Approaches to Function in Grammar, 51-78. Amsterdam: John Benjamins. Workshop Title The Diachrony of Referential Null Arguments Elly VAN GELDEREN ellyvangelderen@asu.edu Mary WILLIE mwillie@email.arizona.edu