Which biometric technology was first successfully implemented in large-scale retail product testing to measure genuine consumer emotional responses in 2018?

The intersection of science and retail is transforming how consumers interact with products. Biometric technology has created unprecedented opportunities for personalization and security in the shopping experience. This poll tests your knowledge about a groundbreaking biometric innovation that changed how products are tested and developed for consumer markets. Understanding these scientific advances is crucial for product developers and marketers in today's technology-driven retail landscape.

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Facial emotion recognition (FER) systems with machine learning algorithms
Galvanic skin response (GSR) wearable sensors
Functional near-infrared spectroscopy (fNIRS) headbands
Pupillary response tracking glasses