Charlot123
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An interesting history about the polygraph test - https://interactive.wttw.com/playlist/2023/01/03/american-experience-lie-detector
“The idea for the lie detector was that it would be a way to constrain the police themselves,” Alder says. At the time, in the early 1920s, it was common for police in America to obtain confessions via what was known as the “third degree”: torturing or beating up suspects in interrogation. The lie detector “would be a more humane kind of third degree,” Alder explains.
The article also mentions IQ tests - which, I believe, are used in United States courts.
(To be fair, the 1920es were a very special time for the US, the time of the Prohibition, the mafia, the bootleggers. So an attempt to objectify some responses could have been a commendable idea given the atmosphere.) As to IQ tests, they have been normed in different groups, so objective. Also, it is not the full IQ but what drags it up or down that might be important in school planning. Example: a person with good reading fluency but poor reading comprehension. For a long time I could not understand it until a neuropsychologist explained that it was often seen in people with high processing speed and poor working memory. (By the time the person reaches the end of the phrase, he, essentially, forgets the beginning. That at least explains an individual’s roadblocks. The science of training working memory is developing slowly.) Using full IQ as the predictor of achievements would fail. The best example would be Richard Feynman, the famed physicist and Noble Prize winner, whose IQ was 125, in high average range. Scores of books were written about Mr. Feynman, some are especially interesting to read after the success of “Oppenheimer”, but suffice it to say that once, Richard Feynman declined the invitation to Mensa, joking that he was “not smart enough” for them. Perhaps it is human ability to ask questions and challenge the world that defies measurements.