Snapshot · Modern Wisdom
Average human blink rate in conversation is about 15 per minute; under stress it can spike to 85–90 without the person noticing, making it one of the most reliable behavioral stress indicators.
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At 1:23:12 · chapter starts 1:21:55
Blink rate is one of the most reliable physiological signals available in everyday conversation. Stress drives it from the normal 15 per minute up to 85–90. Intense focus drives it down to 2. Psychopaths in interviews who don't blink aren't relaxed — they're intensely focused. Use blink rate as a real-time gauge of engagement or stress in any conversation.
When deeply focused — such as watching a compelling movie — blink rate can drop to as low as 2 per minute, showing focus and relaxation are entirely different states.
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