Visual color acuity correlates with IQ, as Galton predicted. r = .63! You can try yourself online. http://emilkirkegaard.dk/en/wp-content/uploads/Showing-their-true-colours-Possible-secular-declines-and-a-Jensen-effect-on-colour-acuity-More-evidence-for-the-weaker-variant-of-Spearmans-Other-Hypothesis.pdf … http://emilkirkegaard.dk/en/wp-content/uploads/Showing-their-true-colours-Possible-secular-declines-and-a-Jensen-effect-on-colour-acuity-More-evidence-for-the-weaker-variant-of-Spearmans-Other-Hypothesis.pdf …pic.twitter.com/IGtUsBrc5J
