After 8 years as a mathematician, I am currently doing post-doctoral research as a theoretical neuroscientist at ENS in Paris, funded by a Visiontrain grant in the Odyssee research group, working principally with Romain Brette.
The initial broad topic is how information is coded and transmitted in the brain, specifically with reference to the issue of rate coding versus spike time coding, and synfire chains.
For more up to date information, see my ENS web page.