Which AI-powered linguistic customer experience innovation first introduced adaptive difficulty scaling based on real-time emotional response analysis?

Customer experience in the language industry has evolved dramatically with technological advancements. From multilingual chatbots to personalized language learning experiences, companies are constantly innovating to enhance user engagement. This trivia question explores a groundbreaking customer experience innovation that changed how people interact with language learning platforms. Test your knowledge about the intersection of linguistics and customer experience design!

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DuoLingo's Linguistic Pressure System (2018)
Babbel's EmotiSense Technology (2021)
Rosetta Stone's Neural Feedback Loop (2019)
Memrise's Cognitive Load Balancer (2020)