voice-stress analyzer
Quick Summary
Voice-stress analyzers (VSAs) are a technology that attempts to detect deception by analyzing variations in a person's voice. These devices, available since the 1970s, measure inaudible vibrations called microtremors, which advocates claim speed up when someone is lying. Certain voice patterns may indicate deception, but VSAs have not achieved universal acceptance. Critics argue that the technology cannot differentiate between stress caused by lying and general stress. Unlike polygraphs, which measure physiological responses like heart rate and blood pressure, VSAs focus solely on vocal microtremors.1
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