How does scientists find out IQ of a person that never took any IQ test? For example Albert Einstein, he never took IQ test because at his time there wasn’t any, yet his IQ is approximated 160. Why not 130 or 190? Ans what about fictional characters, like Sherlock Holmes with IQ around 190. It’s not about achievements because it doesn’t make sense, maybe because of their conclusions?
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Keep in mind one of the current conceptualizations of intelligence is performance-based. It compares your individual performance within a cognitive domain to a normed population. Assume the physicists in your example all took an appropriately normed IQ test. Since they work in similar fields we would expect a similar range of IQ scores. Considering the cognitive demands required to work in the field, it is loosely assumed that they would outperform other people on IQ measures. Thus we can try to infer IQ scores of people from the past by finding a similar population – in this case physicists – and apply their expected IQ scores to Einstein.
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