Psychologists at the University of Sussex wanted to see if they could train people to have a similar experience to synesthetes (Bor et al., 2014).
They devised a 9-week training course in which 14 participants learned connections between letters and colours."
"
The average 12-point boost to IQ compared with a control group was unexpected, especially as IQ is notoriously difficult to train.
Significant IQ gains from training are normally limited to people who start with a relatively low score.
But in this study participants IQ’s were already high: their average IQs increased from 116 to 128 (100 is the average).
It is not known if the IQ boost is specific to the synesthesia training or was a general effect of people training their working memory."
The results probably exaggerate -- but this kind of research is on the other hand intuitively meaningful if you think that what is responsible for most of the individual differences in IQ is the degree of neural integration - and thus efficiency (the less time you need to hold something in your mind, the more you can hold in your mind, such that efficiency is what enables the sophistication of imagination, of thinking, itself -- it enables longer and richer 'chains of thought' -- and this is why I think imagination itself is almost synonymous with intelligence).
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