The test doesn't detect lies per se; it measures physiological arousal by comparing responses to 'safe' control questions with answers more pertinent to the investigation.

Though hard to pin down, people enjoy roller coasters thanks to a combination of speed, conquering fear and the positive effects associated with a massive rise in physiological arousal.

In his theory he states that emotions have two ingredients: physiological arousal and a cognitive label.

The cognitive subscale provides a measure of fearful thoughts and impaired cognitive functioning, and the somatic subscale measures the symptoms of physiological arousal.

Studies show that these programs can reduce the level of physiological arousal associated with high stress.