San Diego institutions boast of world’s top neuroscientists  San
Diego will be the brainiest city in the country for the next few
days.  The Society for Neuroscience is holding its annual
convention here, hosting almost 30,000 people. Most of them are
researchers who broadly and narrowly work on two of the hardest
questions in science: Exactly how does the brain work? And how
do you prevent and treat injuries that affect the brain and
spinal cord?  The society — the largest of its kind in the world
— is meeting in San Diego at a key moment. The Obama
administration is preparing to greatly expand the amount of
money it devotes to brain research.  Millions of those dollars
will flow to San Diego, which has one of the largest collections
of neuroscientists in the world. Here are 10 local researchers
whose work has proven to be especially influential.  FRED GAGE
Salk Institute  Gage shook science in 1998 when he discovered
that adults do produce new brain cells, overturning the belief
that humans are born with al