Scientists at the University of Rochester found a unique way to measure high IQ and IQ of the brain in general just by studying individuals and their abilities to filter out noise in images. The results of a visual test where people were told to as quickly as possible detect movements showed similar IQ results as a classic intelligence test.
Quote: "People with higher IQ are quicker at detecting small moving objects" (...) "The relationship between IQ and motion suppression points to the fundamental cognitive processes that underlie intelligence, the authors write. (...) The researchers point out that this vision test could remove some of the limitations associated with standard IQ tests, which have been criticized for cultural bias."