For more on synesthesia, follow these links:
The Synesthesia Battery
Want to know if you are a synesthete? Take the tests on The Synesthesia Battery to find out.
Synesthesia on NOVA Science now
A profile of the synesthesia research in the Eagleman lab.
Synesthesia on Discovery Channel
For a quick overview of synesthesia, see this 6 minute video with Dr. Eagleman on the Discovery Channel.
Synesthesia on Research Channel
For a slightly longer overview, see this 8 minute video with Dr. Eagleman on the Research Channel.
Lecture on Synesthesia
For a more complete view of the phenomenon, see David Eagleman's 1 hour talk at the University of Sydney.

See David Eagleman's TEDx talk entitled "The Future of Reality"
A 26 week New York Times bestseller, Incognito was named a Best Book of the Year by both Amazon and Goodreads. For a taste of the book, see a review in the Wall Street Journal, listen to a conversation on NPR's Fresh Air, or watch a video dialog with Wired Magazine. Reading Incognito now? We'd love to hear feedback!
Sum was the only book of fiction in New Scientist magazine's selection of Best Books of 2009.