This was mentioned a while ago, but some people probably haven’t seen it. Has anyone experimented with synesthesia training and IQ tests?
Learning to become a synaesthete might have an unexpected benefit. The volunteers in the study gained a whopping 12 points in IQ tests, unlike a control group who had no training. Bor says, however, that this might be a general benefit of the intensive training with memory-related tasks, rather than the synaesthesia training per se. “But it’s very rare to report such a large IQ jump so our suspicion is it’s something to do with synaesthesia,” he says, adding that he may in future make the training tools available online.
Colizoli points out that people with spontaneous synaesthesia also have better memories for information relating to their mixed-up senses. She agrees with Bor, however, that the IQ jump could be due to a general training effect.
Link to Nature: Adults Can Be Trained to Acquire Synesthetic Experiences | Scientific Reports
Originally mentioned here: Study: Synesthesia Can Be Learned
Update: Colorize ebooks and other text for synesthesia training