The latest issue of
The New York Review of Books has
a fascinating article by biologist H. Allen Orr entitled “
Awaiting
a New Darwin.” The piece is a review of Thomas Nagel’s latest book,
Mind
and Cosmos: Why the Materialist Neo-Darwinian Conception of Nature Is Almost
Certainly False, which came out last September. Nagel is as disciplined
in philosophy as Orr is in biology. Both have a longstanding reputation for the
clear exposition of propositions based strictly on logical reasoning, rather
than rhetorical showboating. Orr makes it clear that Nagel’s book should not be
casually dismissed, but he makes it equally clear that he does not feel that
Nagel’s claims have been adequately warranted.
Nagel’s point of departure is a familiar one, based on the
nature of
human
consciousness. Nagel’s position is that consciousness is too subjective to
be reduced to a materialist explanation based on the physical nature of brains
and neurons (and, perhaps, matter itself). With this as a premise, he then
claims that the current Neo-Darwinist model of natural selection cannot explain
how consciousness came to be and offers, as an alternative, an approach he
called “natural teleology.” Orr tries to clarify this approach with the
following sentence:
Natural teleology doesn’t depend on any agent’s intentions;
it’s just the way the world is.
Without going into details, I feel it necessary to recognize
that, for many (
Jürgen
Habermas being a particularly good example), teleology is a highly
objective
process. From a mathematical point of view, one may think of it as the achievement
of some goal, which may be represented as a point in some multidimensional
landscape. The “world as it is,” so to speak, is another point in that
landscape and teleology is concerned with how those two points are connected by
a path and how that path may be found. This boils down to the mathematical
problem of
optimization, which means that Nagel seems to be advocating
an objective technique to explain how we arrive at a subjective phenomenon, a
materialist stance if ever there were one.
On the other hand the philosopher
Isaiah
Berlin has written very critically about the inadequacy of optimization
(or, in his terminology, Utopian thinking). Berlin’s basic argument, nicely
formulated in his essay “
The Decline of
Utopian Ideas in the West,” is that any Utopia, like that point of
optimization on a multidimensional landscape, is
static, meaning that,
one a society or an individual “gets there,” so to speak, there is nowhere to
go! Thus, in the subjective world, the only “static state” is death; and in the
broader ecological scope of the natural world, even death is not a static
point.
At least some of the materialist Neo-Darwinists are aware of
this puzzle. Thus, the traditional Darwinian model of evolution through natural
selection has given way to what has come to be called
coevolution. The
basic idea is that there is still a landscape; but the shape of that landscape
changes to reflect what its “inhabitants” are doing. As the landscape changes,
the “optimum point” on that landscape also changes. This means that, wherever
you happen to be on the landscape, you have to keep rethinking the direction
you want to go in order to get closer to your goal.
This strikes me as
what makes “natural” teleology
natural, rather than merely mathematical.
Back in
October
of 2011, I suggested that, because of coevolution, there may never be that
“ideal” cure for the common cold. Every time new medication comes along, the
landscape changes, and the cold virus follows natural selection according to a
change in the criteria for fitness. (In that same post I suggest that the common
cold is not that different from malware.)
Nagel never mentions coevolution in his book. However, Orr
does not cite it either as a materialist school of thought. Many of its
advocates came out of early research in artificial life, although Darwin himself
described it in
On the Origin of Species. To be fair, however, Nagel’s
book is a short one, only 130 pages, which he uses simply to establish his
position. Here is hoping that he develops that position in greater depth and
that his digging will lead him to coevolution!