XPLAIN: A Proactive Scaffold Across Speech Processing Stages---Supporting Non-Native Speakers in Real-Time AI-Mediated Turn-Taking
XPLAIN is designed and evaluated, a proof-of-concept, proactive Conversational User Interface that maps just-in-time visual scaffolds to distinct stages of speech processing: lexical clarifications for comprehension, contextual suggestions for production planning, and situational summaries for alignment.