Secret Intelligence Service | MI6

The Human Polygraph

This exercise tests whether you can pick up on deception.

How do you tell if someone’s being honest? Listening to verbal cues is one way. Everyone’s voice has a natural pitch and rhythm; sometimes that rhythm becomes interrupted, or the pitch goes up or down. Usually, there’s a good reason – the person could be nervous, or under stress, or yes, hiding a detail or two. See if you can tell the difference.

Test your skills further:

The Emotion DetectorThe Mind Changer