What color is Tuesday? Exploring synesthesia - Richard E. Cytowic

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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. 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.