Synesthesia is a rare neurological phenomena that when triggered causes two senses to be presented simultaneously, usually occurring because the senses are abnormally linked. We studied the prevalence of grapheme to color synesthesia in college students, and found a prevalence of 4.2% among test subjects, higher then the previously estimated prevalence of the condition. We estimated prevalence in college students using three different styles of testing. Two tests to produce a consistency score for graphemes, a memory test as a latency period between the consistency tests, and a survey that participants rated themselves on their synesthetic perceptions.
Niester, Sara, "Prevalence of Synesthesia in College Students" (2014). Honors Projects. 288.