A man's experiment with psilocybin-containing mushrooms seems to have left him with lasting improvements in his red-green vision.
Just before he ingested a single dose of dried psilocybin mushrooms, he took the Ishihara test, a common measure of red-green blindness. Then he kept taking the test at regular intervals for the next four months, reportedly only checking the answers at the end of the experiment. At some point, he talked about his experiment with the doctors, who then administered their own test 436 days after his initial psilocybin use.
The Ishihara test involves looking at plates of colored dots, most of which have patterns that are either invisible or only visible to people with color blindness.The baseline for normal red-green vision is typically considered scoring a 17 or higher on plates 1 through 21. The man’s self-reported score before the mushroom test was 14. Six hours after the test, he only slightly improved, scoring a 15. A day later, however, he scored 18. And eight days later, he reached his peak score of 19.
Like most cases, the man’s color blindness is probably caused by genetic mutations in the retina’s cone cells. Iunlikely that psilocybin and other psychedelics can somehow fix the inherent defects in these cells or are even affecting the eye directly. Rather, the researchers speculate that these drugs could be inducing new connections in the parts of the brain that are involved in higher-level visual processing, particularly around our perception of colors.
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