The paper focuses on the syntax and semantics of the French verbal prefix auto. It is proposed that auto is an intensifier stating that no agent other than the one specified in the clause (agent-focusing), or, in anticausative clauses, no agent (agent-denying), is responsible for the event. Syntactically, auto merges with a verbal projection, and the nature of the constituent to which it attaches determines and constrains the interpretation of the clause. The proposed analysis of auto provides support for generative approaches in which a v head introduces the external argument role, while a grammatical Voice head determines its syntactic realization.
