Determinants of synesthetic color choice for the Japanese logographic script, Kanji, were studied. The study investigated how synesthetic colors for Kanji characters, which are usually acquired later in life than other types of graphemes in Japanese language , are influenced by linguistic properties such as phonology, orthography, and meaning. Of central interest was a hypothesized generalization process from synesthetic colors for graphemes, learned prior to acquisition of Kanji, to Kanji characters learned later. Results revealed that color choices for Kanji characters (...) depend on meaning and phonological information. Some results suggested that colors are generalized from Hiragana characters and Arabic digits to Kanji characters via phonology and meaning, respectively. Little influence of orthographic information was observed. The findings and approach of this study contributes to a clarification of the mechanism underlying grapheme-color synesthesia, especially in terms of its relationship to normal language processing. (shrink)

Studies of linguistic synaesthesias in English have shown a range of fine-grained language mechanisms governing the associations between colours on the one hand, and graphemes, phonemes and words on the other. However, virtually nothing is known about how synaesthetic colouring might operate in non-alphabetic systems. The current study shows how synaesthetic speakers of Mandarin Chinese come to colour the logographic units of their language. Both native and non-native Chinese speakers experienced synaesthetic colours for characters, and for words spelled in the (...) Chinese spelling systems of Pinyin and Bopomo. We assessed the influences of lexical tone and Pinyin/Bopomo spelling and showed that synaesthetic colours are assigned to Chinese words in a non-random fashion. Our data show that Chinese-speaking synaesthetes with very different native languages can exhibit both differences and similarities in the ways in which they come to colour their Chinese words. (shrink)

Until relatively recently, researchers believed that synaesthetic sensations and their triggers were arbitrarily paired, and entirely idiosyncratic from one synaesthete to the next. Put differently, they believed that no two synaesthetes would have similar experiences from the same set of triggers, unless this had occurred by chance. This position likely arose because, prior to the internet, it was extremely difficult to recruit more than a small handful of synaesthete participants, and on the surface, synaesthetes do tend to disagree on their (...) associations when compared one-on-one. However, recent advances in communication have allowed researchers access to far larger groups of synaesthete participants, and this has changed our opinion about how similar synaesthetes might in fact be. A dedicated body of research has now shown that synaesthetic associations are built, to some extent, on a set of unconscious 'rules', shared across synaesthetes. These rules dictate the choice of sensation for certain triggers, and allow us to see patterns emerging which, although not absolute, provide a type of coherence across synaesthetes as a whole. I shall also show that some of these underlying rules operate in the population at large, to allow all individuals to make intuitive pairings across the senses. This chapter describes some of these rules, across a range of different modalities, and across different variants of synaesthesia. (shrink)

Determinants of synesthetic color choice for Japanese phonetic characters were studied in six Japanese synesthetes. The study used Hiragana and Katakana characters, which represent the same set of syllables although their visual forms are dissimilar. From a palette of 138 colors, synesthetes selected a color corresponding to each character. Results revealed that synesthetic color choices for Hiragana characters and those for their Katakana counterparts were remarkably consistent, indicating that color selection depended on character-related sounds and not visual form. This Hiragana–Katakana (...) invariance cannot be regarded as the same phenomenon as letter case invariance, usually reported for English grapheme-color synesthesia, because Hiragana and Katakana characters have different identities whereas upper and lower case letters have the same identity. This involvement of phonology suggests that cross-activation between an inducer brain region and that of the concurrent area in grapheme-color synesthesia is mediated by higher order cortical processing areas. (shrink)