 Some forms of lexical-gustatory synesthesia are triggered by thinking of the word's meaning, rather than its sound or spelling.Others are triggered by hearing or reading an inducer word.In many forms, more well known words and words used with a higher frequency are more likely to have a strong taste association The phonological roots associated with this form of synesthesia drive the current research on lexical-gustatory synesthesia to determine which parts of the brain are active in synesthetes causing the neurological cross-talk condition and how the findings may relate to neurologically normal persons.