Page "Surveillance" Paragraph 33

Another form of behavioral biometrics, based on affective computing, involves computers recognizing a person's emotional state based on an analysis of their facial expressions, how fast they are talking, the tone and pitch of their voice, their posture, and other behavioral traits.

This might be used for instance to see if a person is acting " suspicious " ( looking around furtively, " tense " or " angry " facial expressions, waving arms, etc.

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