Biometrics
Involuntary biological responses — the body's automatic reactions to stress and arousal that can't be consciously controlled.
Biometric cues are the autonomic responses the body produces under stress: changes in breathing, sweating, skin color (flushing or pallor), pupil dilation, a dry mouth, a pulse visible at the neck.
Because these are driven by the autonomic nervous system, they're almost impossible to suppress. When someone's words and face stay calm but their biometrics spike, the mismatch is itself an anomaly.
Biometrics rarely tell you why someone is aroused — fear, exertion, excitement, and deception can look alike — so they're read as part of a cluster, not as a verdict.
Key indicators
- Autonomic responses: breathing, sweating, color, pupils, pulse
- Nearly impossible to consciously control
- Signal arousal, not its cause — read in clusters
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