Imagine Magazine - Johns Hopkins - May/June 2016 - (Page 6)
Illuminating the Brain
Karl Deisseroth, M.D., Ph.D.
D.H. Chen Professor of Bioengineering and
of Psychiatry and Behavioral Sciences
Stanford University
Shortly after starting his lab at Stanford in 2004, Karl Deisseroth began
work on a technique that would revolutionize brain science. With graduate students Feng Zhang and Edward Boyden, over the next several years
his lab developed optogenetics, in which light-sensitive proteins from
algae are inserted into neurons, allowing researchers to precisely control
neural activity with light. His next groundbreaking technique began as
an effort with lab members Viviana Gradinaru and Charu Ramakrishnan
to build polymers and hydrogels within brains, and was developed with
postdoctoral fellow Kwanghun Chung into a method for rendering brains
transparent but leaving neural structures intact. Called CLARITY, this
technique offers researchers an unprecedented view of brain networks.
A member of the National Academy of Sciences and the National
Academy of Medicine, Deisseroth is the recipient of numerous awards,
including the Lurie Prize in Biomedical Sciences, the Keio Prize, the
Dickson Prize, and the Breakthrough Prize in Life Sciences.
Birth of a neuroscientist
When I went to college, I
was pretty serious about
exploring my creative side.
In my first semester at Harvard I took a creative writing
course. But at the same
time, I became enthralled
by biological science,
particularly the linkages
between computation and
biology. I became extremely
interested in biochemical
computations-how the
networks of signaling molecules work inside cells.
That interest broadened
to neuroscience when I learned in an engineering class
how the field of computational information processing and
storage had influenced neuroscience in a bidirectional way.
I was exposed to computational means by which you can
use neuron-like programs-basically computational neural
networks-to store information. At that moment there was no
turning back.
6
imagine
The best-laid plan
Having decided that I wanted to understand aspects of
how neural systems work, I thought, Well, I've got to study
the most complicated one. That was the human brain. I
decided to become a neurosurgeon because they had
the best access to the brain. That meant I had to go to
medical school.
In the third and fourth years of medical school, you do
rotations and get exposed to different types of medicine. I
was so sure I was going to do neurosurgery that that was
the very first rotation I did, and I loved it. I enjoyed the
operating room. I loved the impact you could make on
patients' lives.
I also had to do some required rotations, including one
in psychiatry. I was not looking forward to it. There were
not many things I was sure I wouldn't do, but that was one
of them. Then the time came when I had to do it, and it was
transformative. It was fascinating to me that these patients'
brains could work so differently but without a clear focus
of something that you could point to that showed why: a lab
test, a measurement, an image. The nature of the pathology
is completely hidden. Right away I thought, This is it. This is
where I should be.
Beyond imagination
The human brain has a blood supply, ion channels, and
metabolic needs, and all the things that make a complex
tissue work. What really makes it special is how it creates
emotions, perception, action; how it resolves dilemmas,
stores information, and creates a unitary percept out of
immensely complicated information streams.
There are so many incredible tasks that the brain has to
do and problems that it solves, yet not only do we not know
how they are done, we can't imagine how they are done. We
cannot replicate those effects-that creation of emotion or
affect, the high rates of information processing with fragile
and low-power biological devices-in a computer. It is just
amazing how the brain achieves these extremely complex
cognitions and emotions and reality constructions from cells.
Shedding light on neural circuits
How do you understand the causal significance of what a
cell or a group of cells is doing? That is really the heart of
understanding how the brain works. You can look at brain
imaging, and you can image blood flow during behavior
with MRI, and you can put electrodes in to hear the action
potentials that neurons use to communicate. But you don't
May/June 2016
DEISSEROTH LAB, STANFORD UNIVERSITY
in my own words
Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - May/June 2016
Big Picture
In My Own Words Karl Deisseroth, Professor of Bioengineering and of Psychiatry, Stanford University
Mind Brain Philosophy and neuroscience at CTY
A Meeting of the Minds at the National Brain Bee
Mind over Matter Overcoming communication barriers via technology
A Fish of a Different Color My neuroscience internship
Immersed in Brain Science Summer research at Rockefeller University
Brain Training Four graduate students share their research
Prime Time for Brain Science Exciting new findings, from brain maps to mindfulness
Making the Connection Teaching kids about mind, media, and health
Selected Opportunities and Resources
Pitch Perfect The lure of rugby
My Stress-Free Adventure Scuba, sailing, and discovery
Off the Shelf Review of Kazuo Ishiguro’s The Buried Giant
Word Wise
Exploring Career Options Interview with neuropsychologist Lisa Jacobson
One Step Ahead Ten commandments for college success
Planning Ahead for College Can your dream school become a reality?
Students Review New York University
Creative Minds Imagine Fiction contest winners
Mark Your Calendar
Knossos Games
Mind + Brain Philosophy and neuroscience at CTY
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