[Tyler]

How Brains and Computers Differ
     

This
nice overview of the differences between
biological brains and modern computers highlights
important reasons why our digital electronics and
even neural network simulations running on them fall short of the
abilities we take for granted in living systems.
The list of points include content-addressable memory, variable
clock rates, pointers as short term memory, lack of separation
between software and hardware, unification of memory and
processing, the underestimated complexity of synapses,
self-organization, and the overall size of the systems.
   

http://robots.net/article/2501.html