9 Similarities among Synesthetic Perceptions

There are also newer insights with respect to similarities among synesthetic perceptions of color. The common denominator between colors and letters appears to be the relative frequency with which they occur in language. Thus, for example, the color red is often bound to the letter A, and both of them are used more often in language than, for instance, the letter Z or the color violet (Simner 2005). In addition, a connection was observed between the relative frequency of letters, brightness, and saturation of photisms. Letters that occur more frequently are linked to colors that are brighter and more highly saturated (Beeli 2007).