Measuring Deception: A Review of Tremors in the Blood
Measuring Deception: A Review of Tremors in the Blood In Tremors in the Blood: Murder, Obsession and the Birth of the Lie Detector , Amit Katwala tells the story of an invention that promised to make deception physically visible. By recording changes in breathing, pulse, and blood pressure, the polygraph appeared to offer police and courts something they had always wanted: an objective method for separating truth from lies. Yet the device never truly measured lies. It measured physiological arousal and depended on an examiner to decide what those bodily changes meant. Nervousness could resemble guilt, while confidence and self-control could disguise deception. Despite this fundamental problem, the polygraph spread through American policing, employment screening, intelligence work, popular culture, and private life. Katwala approaches this history through a combination of true crime, biography, psychology, and technological cautionary tale. At the center are three striking figures...