Which linguistic feedback innovation revolutionized how language learning apps collect user experience data?

In the world of language products and services, companies have developed innovative ways to gather customer feedback and improve user experiences. From language learning apps to translation services, the methods used to understand customer needs have evolved dramatically. This poll tests your knowledge of how linguistic product companies revolutionized customer feedback systems. Do you know which breakthrough changed how we understand language learner experiences?

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Sentiment analysis algorithms that detect frustration in voice recordings during pronunciation exercises
Eye-tracking technology that measures how long users spend reading foreign text passages
Neural mapping software that visualizes brain activity during vocabulary memorization
Keyboard pressure sensors that measure confidence levels during writing exercises