How does one experience synesthesia -- the neurological trait that combines two or more senses? Synesthetes may taste the number 9 or attach a color to each day of the week. Neurologist Richard E. Cytowic explains the fascinating world of entangled senses and why we may all have just a touch of synesthesia.
Lesson by Richard E. Cytowic, animation by TED-Ed.
![](https://i.ytimg.com/vi/d4o16iAwLB4/mqdefault.jpg)