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.

Sum was selected as Book of the Week by both The Guardian newspaper and The Week newsmagazine.
Wednesday is Indigo Blue: Discovering the Brain of Synesthesia has been awarded the Montaigne Medal, Eric Hoffer Award for Books.

Click here to watch David's talk on possibilianism at PopTech. Executive director Andrew Zolli wrote: "This is one of the best talks ever at PopTech. Everyone should watch this."