From Guy Cox, St Albans, New South Wales, Australia
Sam Wong reports men with colour blindness dropping out of a study on psychedelic drugs because of visual effects (17 June, p 22) and Tony Durham suggests this may inform how we see colour (Letters, 9 September). Colour blindness is a result of faulty detection in the eyes. But if the brain can still process trichromatic vision, hallucinations could appear in full colour, resulting in “seeing” colours never experienced before.
I cannot even conceive what this would be like, but I imagine it would be very disorientating.
