"The brain is an organ, and like other organs-the heart, the lungs, the
liver-has an internal biochemistry that can break down. Because of the
special role of the brain, there are those who want to believe that it
can only be affected by the environment; they refuse to face the fact
that the brain, like other organs, while functioning effectively in
most areas, may have one part go awry and cause major malfunction. If
we treat the brain as another organ, then the fact that... a human goes
berserk is as easy to comprehend and as difficult to unravel as cystic
fibrosis, tuberculosis, or AIDS."
Daniel Koshland, in Science, 1992