Aspergers and emotions

I read the NYT review of Switched On the other day, and didn't quite know what to make of it. John Robison underwent "transcranial magnetic stimulation" to see if that would have any effect on his Aspergers. Apparently it did, and the book is a description.

I'd like to know more, and am on the on-hold list at the library. A few questions come to mind after reading the review.

• What exactly is this supposed to be doing?
• What exactly became of the other patients and why is he different?
• Did his newfound emotions map correctly onto what they were supposed to? He said that most people seemed sad to him now--not sure that's an accurate observation.

Anybody know more?