Experimental Evidence for the Truth Conditional Contribution and Shifting Information Status of

15 sentence in which they appear. Here, we address this question head-on experimentally. We first investigate the information status of appositives and find that while nominal appositives (e.g. a classical violinist) and sentence-medial appositive relative clauses (e.g. who is a classical violinist) are largely not at issue, sentence-final appositive relative clauses can become at issue, as witnessed in their becoming the target of a direct rejection and 20 being associated with subsequent questions. We then investigate the truth conditional contribution of appositives to sentences in which they appear, and find that whenever an appositive is false, participants judge the entire sentence False. Reaction times complement truth value ratings to demonstrate that this decision is largely automatic. We discuss possible reasons for the difference among appositive types and sentential