Which innovative market research technique was first widely adopted by mathematics textbook publishers in the early 2000s that revolutionized how they developed products?

Market research in the mathematics education industry has evolved dramatically over the decades, with various methodologies developed to better understand how students learn and engage with mathematical concepts. One particular innovation revolutionized how mathematics textbook publishers gather and analyze student learning data, leading to significant changes in how educational products are developed and marketed. Test your knowledge about this pivotal moment in mathematics education product research!

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Eye-tracking studies that mapped how students visually processed mathematical notation and diagrams
Cognitive load measurement through EEG monitoring during problem-solving sessions
Virtual reality simulations that recorded student interactions with 3D mathematical models
Sentiment analysis of student journal entries after completing mathematical exercises