Focus groups capture what people say after the room has already steered them. This is how EmotionTrac captures the blink: the face before the polite answer.
Shelli Garson (Audience Insights at EmotionTrac) walks through creative testing on a 30-second commercial. Panelists watch on their phones. The system records micro-expressions, scores sentiment (happy, fear, anger), then plots the trajectory frame by frame. You see the spike, the dip, and which shot actually landed. You can cut it by age, gender, income, and race.
If you make ads, this is for creative, branding, and commercial testing.
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