The induction of synaesthesia with chemical agents: a systematic review
Frontiers in Psychology January 1, 2013 David P. Luke, Devin B. Terhune 81 citations
A review of published studies finds consistent evidence that serotonin agonists can temporarily produce synaesthesia, a condition where senses blend, such as seeing sounds. However, the research has many methodological flaws and little experimental work has been done. While the findings point to the serotonergic system's role in synaesthesia, the limitations prevent firm conclusions about whether chemicals truly induce genuine synaesthesia.