Unfortunately, researchers in artificial intelligence (AI for
short henceforth) lose intellectual contact with Professor Lighthill
almost immediately, because he divides the field into three categories
A, B, and C so that our our main research goals are in none of his
categories.  

	Category A is \F1advanced automation\F0 or \F1applications\F0,
and he approves of it in principle.  Included in A are
some activities that are obviously applied but also activities like
computer chess playing that are often done not for themselves but
in order to study the structure of intelligent behavior.

	Category C comprises studies of the \F1central nervous system\F0
including computer modeling in support of both neurophysiology and
psychology.

	Category B is defined as "building robots" and "bridge" between
the other two categories.  Lighthill defines a robot as a program or
device built neither to serve a useful purpose nor to study the central
nervous system which obviously would exclude Unimates, etc. which are
generally referred to as industrial robots.  Emphasizing the bridge aspect
of the definition, Lighthill takes as obvious that work in category B is
worthwhile only in so far as it contributes to the other categories.