These are excerpts and elaborations from my book "The Nature of Consciousness"
Life is not the only field
in which traditional Physics seems to be powerless to offer comprehensive explanations.
The brain is another system that seems to obey laws that only partially reflect
the linear universe implied by Physics. Explaining the evolution of life
required a new paradigm, the paradigm of “design without a designer”. It turns
out that the functioning of the brain (that is responsible for the evolution of
our thoughts) requires a similar paradigm. A word of caution:
everything we think about the brain comes from our brain. When I say something
about the brain, it is my brain talking about itself. Connectionism Human memory may be
deficient in many ways (it forgets, it does not remember
"photographically"), but somehow it is extremely good at recognizing.
I’d recognize a friend even
if he grew a beard, even if he's wearing different clothes every day, even if I
see him sideways, and from any possible angle. How can I recognize all those
images as the same image if they are all different? It is almost impossible to
take the identical shot of a person twice: some details will always be different:
how can I recognize that it is the same person, if the image is always
different? I can show you two pictures of a street, taken at different times:
you will recognize them as pictures of the same street. But there are probably
countless differences: cars that were parked moved away and new cars took their
places, pedestrians that were walking are gone, dogs and birds have changed
positions, smoke has blown away, all the leaves of all the trees have moved
because of the breeze, etc. How do you recognize that it is the same street, if
the image of that street is never the same? Even a baby recognizes that an
object turned sideways is still the same object, even if it looks completely
different. Take a box and rotate it 45 degrees: it now looks like a completely
different geometric figure. Nonetheless, a baby can recognize that it is the
same object. The key to understanding our
memory may lie in the peculiar structure of our brain. Unlike most of our
artifacts, which are designed to be modular, hierarchical and linear, a brain
is an amazingly intricate piece of work. The brain does not work the way our
artifacts work. There seems to be no “designer” that specifies what has to be
designed. There seems to be a huge number of connected units, none of which prevails
and all of which cooperate in some fashion to produce what transpires as
“intelligent” behavior. At the end of the 19th
century, the US psychologist William James had a number of powerful
intuitions: 1. That the brain is built to ensure survival in the world; 2. That
cognitive faculties cannot be abstracted from the environment that they deal
with; 3. That the brain is organized as an associative network; 4. That
associations are governed by a rule of reinforcement. The latter two (3 and 4)
laid the foundations for the “connectionist” model of the brain. The former two
(1 and 2) laid the foundations for a cognitive model grounded in a Darwinian
scenario of survival of the fittest. Back to the beginning of the chapter "Inside The Brain" | Back to the index of all chapters |