Useful but Distracting: Viewer Experience with Keyword Highlights and Time-Synchronization in Captions for Language Learning

Captions are a valuable scaffold for language learners, aiding comprehension and vocabulary acquisition.Past work has proposed enhancements such as keyword highlights for increased learning gains.However, little is known about learners' experience with enhanced captions, although this is critical for adoption in everyday life.We conducted a survey and focus group to elicit learner preferences and requirements and implemented a processing pipeline CCS Concepts Applied computing E-learning; Computing methodologies Speech recognition;