Common Letters And Numbers Are Brighter, Study Suggests. Makes perfect sense to me!
I’ve always found it curious that the five highest-scoring Scrabble letters (K, J, Q, X and Z) all happen to be different shades of brown in my synesthetic map of the alphabet. Now there’s a new study by Daniel Smilek et al that suggests that this may be a pretty common phenomenon: “The More Common the Digit, the More Radiant the Color in Grapheme Color Synaesthesia”. How cool! This is the same Smilek who distinguished “projector” from “associator” synaesthetes in 2004.
(thanks to James for the link!)