more complex and useful. There are people who have lived for days and even months with
artificial hearts, and many more people who live for years with pacemakers.
We can imagine, little by little, this part and that part of the human being replaced by inorganic
materials and engineering devices. Is there any part which we would find difficult to replace,
even in imagination?
I don't think anyone would hesitate there. Replace every part of the human being but one—the
limbs, the heart, the liver, the skeleton, and so on—and the product would remain human. It
would be a human being with artificial parts, but it would be a human being.
But what about the brain?
Surely, if there is one thing that makes us human it is the brain. If there is one thing that makes us
a human individual, it is the intensely complex makeup, the emotions, the learning, the memory
content of our particular brain. You can't simply replace a brain with a thinking device off some
factory shelf. You have to put in something that incorporates all that a natural brain has learned,
that possesses all its memory, and that mimics its exact pattern of working.
An artificial limb might not work exactly like a natural one, but might still serve the purpose. The
same might be true of an artificial lung, kidney, or liver. An artificial brain, however, must be the
precise replica of the brain it replaces, or the human being in question is no longer the same
human being.
It is the brain, then, that is the sticking point in going from human organism to robot.
And the reverse?
In my story “The Bicentennial Man”, I described the passage of my robot-hero, Andrew Martin,
from robot to man. Little by little, he had himself changed, till his every visible part was human
in appearance. He displayed an intelligence that was increasingly equivalent (or even superior) to
that of a man. He was an artist, a historian, a scientist, an administrator. He forced the passage of
laws guaranteeing robotic rights, and achieved respect and admiration in the fullest degree.
Yet at no point could he make himself accepted as a man. The sticking point, here, too, was his
robotic brain. He found that he had to deal with that before the final hurdle could be overcome.
Therefore, we come down to the dichotomy, body and brain. The ultimate cyborgs are those in
which the body and brain don't match. That means we can have two classes of complete cyborgs:
a) a robotic brain in a human body, or
b) a human brain in a robotic body.
We can take it for granted that in estimating the worth of a human being (or a robot, for that
matter) we judge first by superficial appearance.
I can very easily imagine a man seeing a woman of superlative beauty and gazing in awe and
wonder at the sight. “What a beautiful woman,” he will say, or think, and he could easily imagine
himself in love with her on the spot. In romances, I believe that happens as a matter of routine.
And, of course, a woman seeing a man of superlative beauty is surely likely to react in precisely
the same way.
If you fall in love with a striking beauty, you are scarcely likely to spend much time asking if she
(or he, of course) has any brains, or possesses a good character, or has good judgment or kindness
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