Dr. Charles Limb, both a musician and a neuroscientist, conducts some intriguing research about which I have blogged before. Click for my post Play what you know and then play above that: The role of improvisation in mediation.
I am happy to see that he now has given a TED presentation. Click to watch Limb's talk. The description from the TED Web site:
Musician and researcher Charles Limb wondered how the brain works during musical improvisation -- so he put jazz musicians and rappers in an fMRI to find out. What he and his team found has deep implications for our understanding of creativity of all kinds.