Which market research innovation, first widely adopted in the early 2000s, dramatically changed how game developers collect player behavior data?

The gaming industry relies heavily on market research to understand player preferences and behaviors. One groundbreaking technique changed how game developers collected player feedback and revolutionized game testing. Test your knowledge about this pivotal moment in gaming market research history that shaped how games are developed today.

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Heatmapping technology that tracked player movement and death locations in multiplayer games
Eye-tracking hardware that measured which UI elements players focused on most
Biometric wristbands that measured player emotional responses during gameplay
Focus group streaming technology that allowed developers to watch players remotely