What is a polygraph test?
Poly - Meaning 'many', Graph - Meaning chart paper with markings on.
What is Forensic Psychophysiology?
Forensic - means it is scientific and can be used at the CCMA or court as expert evidence.
Psycho - That which affects the workings of the human mind.
Physiology - That which affects the workings of the human body.
PDD
Psychophysiological Detection of Deception (PDD) is the process of determining if a person is attempting to deceive or being truthful to an issue under investigation. Unconscious conflicts between your ID and Superego cause inner tension.
Theory of PDD:
The fear of detection of deception (lying) will cause changes in the body, at or near the point in time of the deception. A trained Polygraph Examiner can diagnose these changes.