The review is HERE.
Block and Kitcher's piece is not just great because it exposes just how bad Jerry Fodor's recent arguments concerning natural selection are. It also explains really clearly a lot of interesting philosophical issues concerning natural selection. Here is a fantastically clear discussion of how to test whether the property of having more black wings for moths in industrial England is a free rider or a trait that increases selective fitness.
Enter Gould and Lewontin. Maybe moth coloration is a spandrel, and some
other property of the moths is both relevant to their proliferation and
correlated with their color. For example, evolutionary biologists have
observed that moths usually rest by day on the undersides of branches
rather than on the trunks of trees. So is the familiar
black-as-camouflage story really true? Perhaps a characteristic of the
larvae of melanic moths makes them more likely to survive. Or perhaps
melanic moths have a tendency to move around less at night, which makes
them less vulnerable to being eaten by bats (who care nothing for
color). These are interesting alternatives to the familiar story, and
the causal hypotheses they introduce can be tested in obvious ways: by
examining the rates of larvae survival or by investigating nocturnal
motions of moths. And this is what biologists have done. Concerned that
an apparent adaptation (a camouflaging color) may be a side effect,
they have looked for correlated traits that might figure in some
alternative process that would culminate in greater representation of
the melanic moths. Despite some controversy in the 1990s, the
traditional story seems to be standing up well.
This leads to a discussion that can help with a really nice explanation of Heideggerian "world-poorness" in terms of the "disjunction problem" (that Fodor and Piatelli-Palmarini wrongly take to undermine evolutionary explanations). [Also note that MacIntyre's Dependent Rational Animals has a great discussion of world-richness and argument that Heidegger was wrong to treat it as an on or off phenomena that higher animals lack.]
What exactly could this trait be? One possibility, suggested by
remarks in some of Fodor’s previous writings, would be that there are
two different properties: being black, on the one hand, and matching
the environment on the other. Is there a fact of the matter as to which
of these causes the reproductive success?
There are two ways to
interpret the question, and each one has a good answer. The first
focuses on the specific environments in which melanic moths are
selected: the woods that have suffered from industrial pollution. In
these environments, being-well-camouflaged and being-black
come to more or less the same thing. In a polluted environment, a black
moth matches the surroundings better than a lightly speckled moth. The
result is less predation and hence increased survival and procreation.
Biology focuses on the process, and biologists are quite willing to
identify how selection is acting by picking out any feature of the
organisms that is central to the process. So if you are focused on this
specific environment, then it is a matter of indifference whether you
talk of selection for black color or for camouflage or for decreased
predation. Among these options, you can talk as you like. Any
of them will distinguish the selection process of the traditional
industrial-pollution story from the potential rivals, such as larval
resilience, or lower nocturnal mobility.
A second interpretation would consider all
the woody settings in which the moths can be found. Speckled moths will
be at a disadvantage if they rest on polluted trees (they will be
picked off more easily), and melanic moths will be similarly vulnerable
in unpolluted surroundings. Biologists can test and confirm these
causal facts, and can report their conclusions by finding that, across
the whole spectrum of environments, matching the color of the trees
causes increased reproductive success. Of course, saying that accords
perfectly with, and generalizes in a particular direction, the thought
that, in the polluted woods, being black causes a moth to match its
environment better. There are no great mysteries, no inscrutable
distinctions between spandrels and properties selected, no general
troubles about distinguishing between the causal powers of correlates.
Block and Kitcher go on to show that the arguments Fodor and friend muster are really just general arguments that if valid, would lead to skepticism about any causal claims both in any area of science and in normal descriptions of the world outside of science. But of course they purport to be establishing something special about evolutionary explanation.
Anyhow, it's Block and Kitcher's piece is one of the best pieces of public philosophy I've read. Here's another bit again relevant to the issue of world-richness,
A different example (due to the philosopher Elliott Sober) can offer
further clues to the ways in which the authors inflate the position
they attack. Sieves are very simple selection devices. Imagine a sieve
with a mesh that will allow balls with radii of one inch to fall
through, but that will retain those that are even a tiny bit larger.
Suppose that balls with several different radii—one inch, two inches,
three inches, and four inches—are placed in the sieve. The one inch
balls are blue, while the larger ones have different colors. The blue
balls fall through, and the others remain. In one sense the sieve has
“selected” the blue balls, although it has not “selected for” being
blue. That is because size not color is what matters
to the transmission. Using the language Fodor and Piattelli-Palmarini
employ, we might say that the property of having a particular color
(blue) is a spandrel or free-rider.
Yet we might divide the properties up more finely. The balls with
radius one inch have a diameter of two inches, a circumference of 2π
inches, a cross-sectional area at the equator of π square-inches, a
volume of 4π/3 cubic inches, etc., etc. Lots of geometrical properties
are correlated—indeed perfectly so. Which of these properties caused the balls to fall through? The question is idle. A person
could select for radius rather than diameter, but the sieve cannot. Yet
that makes absolutely no difference to the judgment originally made:
the sieve selects for size, rather than for color. To recur to the
language of indeterminacy, there is a determinate matter of fact as
between color and size but not as between radius and diameter.
. . . .We can know the fact that the sieve selects for size rather than color
without the presence of any actual environments in which size and color
are not correlated because we understand the causal mechanisms: we know
what would have happened if size and color were de-correlated in this
device, namely, there would still be selection for size rather than
color. A real causal difference is a feature of the world that can be
investigated in different ways, for example, by looking at mechanisms;
by considering real cases of de-correlation; or by looking at cases
where the selection pressures are slightly different, such as
unpolluted environments in which light moths are at a disadvantage. The
way evolutionary biologists think about causation allows for the
discussion of causal process in any of a number of ways—even those
strange ways that invent peculiar properties. Fodor and
Piattelli-Palmarini almost grasp this point where they discuss the
“prima facie” plausibility that polar bear color is a result of
selection for matching the environment rather than selection for
whiteness, a difference that, as we saw in the analogous case of the
moths, can be real and can be investigated.
They conclude by discussion the nature of intensionality to rebut the claim that evolutionary explanations are intensional (in Frege's sense).
I would like to think through what Block and Kitcher says just because the teleo-semantics (and part of the friendly-to-animals part of the Heideggerian) tradition grounds intensionality in practical reasoning, that is then explicable in something like evolutionary terms.
I would like to argue that there are degrees of intensionality, so Block and Kitcher go a little bit off in stating that evolutionary theory is extensional simpliciter. They argue in this manner:
To see why, consider the notion of causation. If decreasing
temperature causes freezing and decreasing temperature is the same
property as decreasing mean molecular kinetic energy, then decreasing
mean molecular kinetic energy causes freezing. The causal powers of a
property—temperature, say—do not depend on how we refer to it or think
about it. In that respect, causation is extensional.
But if
causation is extensional, then so is selection-for, since selection-for
is a causal idea. Consider, once again, the sieve and the balls. The
balls that are blue and small fall through, leaving the larger (and
differently colored) spheres in the sieve. What is causally responsible
for the blue balls passing through the sieve is that they are small,
not that they are blue; what is selected for is smallness, not
blueness. In sum: being small is the cause, just as being black is the
cause of the moths’ reproductive success rather than (say) correlated
nighttime lethargy.
They are surely right about this, but something like intensionality comes up when we realize that properties that co-substatutibility in causal explanations is a function of background environment. There own example is like this. Mark Wilson shows that there are all sorts of environments where mean kinetic energy and temperature do not co-substitute (in a solid, for example).
Of course Block and Kitcher are correct that this has nothing to do with "how we think or refer about it." Either the property is adaptive or not in a background environment, and there is a fact of the matter about what properties will count as co-extensive in that environment. Nonetheless, the failure of substitutivity as we change environments is a lot like intensionality.
This does not undermine evolutionary theory, but I think it is an important part of the teleo-semantics story (ultimately analogous to Heidegger's characterization of reference as fundamentally non-linguistic, holding between one act done and another act that the first is done for). Substitution success and failure happen non-linguistically in the natural world and also in a prelinguistic world of practical activities.
Anyhow, the article concludes with:
Fodor and Piattelli-Palmarini take the role of philosophy to consist
in part in minding other people’s business. We agree with the spirit
behind this self-conception. Philosophy can sometimes help
other areas of inquiry. Yet those who wish to help their neighbors are
well advised to spend a little time discovering just what it is that
those neighbors do, and those who wish to illuminate should be
sensitive to charges that they are kicking up dust and spreading
confusion. What Darwin Got Wrong shows no detailed engagement
with the practice of evolutionary biology, nor does it respond to the
many criticisms that have been leveled against earlier versions of its
central ideas. In this latter respect, the authors resemble the
creationist debaters who assert that evolution is incompatible with the
second law of thermodynamics, hear detailed refutations of their
charge, and repeat their patter in the next forum.
We admire the
work that both Jerry Fodor and Massimo Piattelli-Palmarini have
produced over many decades. We regret that two such distinguished
authors have decided to publish a book so cavalier in its treatment of
a serious science, so full of apparently scholarly discussions that
rest on mistakes and confusions—and so predictably ripe for making
mischief.
And a reader comments,
jerry fodor has been making the same mistake about 'selection-for' for
at least 2 decades now. just ask ruth millikan! (i am not ruth
millikan, by the way)
thanks to block and kitcher for the excellent review.
I would add to this Fodor's writings on lexical semantics, prominently in Concepts: What Cognitive Science Got Wrong. Read Pustejovsky's devastating take down HERE (or on googlebooks HERE). The weirdest thing to me was that Fodor and Lepore's proposal for a successor theory was already a part of generalized quantifier theory (started by Montague, then developed in Barwise and Cooper's seminal paper, now part of the canon) and really properly speaking compositional and not lexical semantics (though, unlike generalized quantifier theory, Fodor and Lepore had no suggestion about how semantics/syntax interface would be handled, so they really weren't properly speaking offering a theory in any case).
What is in common to the misplaced attacks on both empirical work in semantics and biology, as well as his arguments for crazy forms of innateness, is that Fodor seems to have abrogated to himself the job of being Noam Chomsky's philosophical hit-man. Chomsky has for decades made oracular statements on all three of these issues (anyone remember "I languages versus E languages"?), and Fodor offers up crappy arguments trying to legitimate them. On the innateness issue, Chomsky approvingly notes Fodor's belief that we have an innate concept of CARBURETOR in his piece that Martinich has put in the recent edition of his philosophy of language anthology. So Chomsky at least approves of the service.