![]() They are also being used by employers, insurance companies, and welfare officers. Their inventions are being snapped up by police forces, state agencies, and nations desperate to secure themselves against foreign threats. Startups, racing to commercialize these developments, want us to believe that a virtually infallible lie detector is just around the corner. In the past couple of decades, the rise of cheap computing power, brain-scanning technologies, and artificial intelligence has given birth to what many claim is a powerful new generation of lie-detection tools. Betrayal oozes out of him at every pore." "If his lips are silent, he chatters with his fingertips. "No mortal can keep a secret," wrote the psychoanalyst in 1905. We stutter, stall, and make Freudian slips. Hearts race, sweat drips, and micro-expressions leak from small muscles in the face. The mystery is how we keep getting away with it. We lie to promote ourselves, to protect ourselves, and to hurt or avoid hurting others. But most people tell one or two "big" lies a day, says Richard Wiseman, a psychologist at the University of Hertfordshire. The majority of the lies we tell are "white," the inconsequential niceties - "I love your dress!" - that grease the wheels of human interaction. The average person hears up to 200 lies a day, according to research by Jerry Jellison, a psychologist at the University of Southern California. We lie to our employers, to our partners, and most of all, one study has found, to our mothers. We learn to lie as children, between the ages of 2 and 5. ![]()
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