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A polygraph, often incorrectly referred to as a lie detector test, [1] [2] [3] is a pseudoscientific [4] [5] [6] device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions. [7]
Lie detection is an assessment of a verbal statement with the goal to reveal a possible intentional deceit. Lie detection may refer to a cognitive process of detecting deception by evaluating message content as well as non-verbal cues. [1]
As "Prospects of fMRI as a Lie Detector" [9] states, fMRIs use electromagnets to create pulse sequences in the cells of the brain. The fMRI scanner then detects the different pulses and fields that are used to distinguish tissue structures and the distinction between layers of the brain, matter type, and the ability to see growths.
The polygraph test may have changed public opinion of the Ramseys but did not change their legal status as polygraph results are not admissable in court. John Mark Karr confessed to the murder in ...
Williamson was later asked by sheriff’s investigators to take a polygraph test. The district attorney’s office said he agreed to the test and passed, which “at the time, cleared him of any ...
More than a decade after the death of 2-year-old Caylee Anthony, her grandparents, George and Cindy Anthony, have agreed to take lie detector tests on camera in response to Casey Anthony's recent ...