Tissue grafted into the central nervous system sparks a far less hostile response
than tissue grafted to
other parts of the
body, prompting scientists to consider the
brain «immunologically privileged.»
But when you analyze your
brain, you will find inside it a set
of nerve cells that form a large complex: one that can distinguish among a large repertoire
of states in a way that its
parts can not; and one that does so maximally, more
than any
other set
of nerve cells, more
than the entire
body,
than any crowd
of men,
than the world itself.»