Reply to Goldman's section 5
I'm not letting that pass. Whether or not he
deigned to cite my immortal work Judgement and Justification (or,
at a minimum, Larry Sklar's "Methodological Conservatism"), Goldman should
at least have acknowledged that the position he takes against the pragmatic
virtues is controversial and that the opposing side has been (ahem) impressively
defended. He does cite Harman on conservatism, but only to dismiss
him with a one-sentence objection.
More generally, the view Goldman is rejecting
without mentioning it by name is explanatory coherentism or "explanationism,"
defended by Quine, Quine & Ullian, Sellars, Harman, me, Paul Thagard
and Peter Lipton among others. (On which, see again my "Explanation
and Epistemology.") That view is centered on the notion of a
"best explanation": A nonbasic belief is justified when it is part
of the best overall explanatory account of some range of phenomena--where
the good-making features of an explanation are taken to be the pragmatic
virtues. Besides the three mentioned by Goldman, there are testability,
fecundity, neatness, and doubtless others.
I might as well begin by addressing Goldman's
one-sentence objection to conservatism, the wishful thinking example on
p. 38. There are two subcases which it is important not to conflate:
(W1) the wishful thinker holds her/his wishful belief contrary to evidence;
(W2) s/he holds the belief in the absence of relevant evidence.
(W1) is beside the point. The pragmatic
virtues are always and everywhere "other things being equal" desiderata;
they do not (usually) counteract evidence.<1> In particular,
an explanationist who accepts conservatism as a virtue does not claim that
conservatism justifies a belief in the face of contrary evidence.
In (W2), the subject finds her-/himself holding
a belief without having any particular evidence either for or against it.
Here the explanationist conservative does maintain that the belief is justified
at least in the sense of being permissible, if only because of the cognitive
cost of rejecting it and making the attendant revisions in one's surrounding
belief system. (I shall reprise some motivation for that view below.)
So the conservative is not and should not be impressed by Goldman's bare
assertion to the contrary.
Generality: I myself have no big axe to grind
here, but for the record I agree with Clea that a preference for generality
of hypothesis does play some role in "the prosaic purposes of everyday
life" and is not proprietary to the official sciences. As Goldman
himself puts it (p. 38), "[i]f more can be explained with less, so much
the better." I myself think "generality" is just a special case of
simplicity.
But note again that Goldman's specific objection,
that "finding...[true] generalizations is not always more important to
us than finding truths about particulars," is an ignoratio elenchi.
To my knowledge, no human being has ever held that finding true generalizations
is always more important to us than finding truths about particulars.
Rather, we prefer more general to less general hypotheses, other things
being equal (which other things almost never are).
Simplicity: Goldman is right that "simplicity
means different things to different theorists and no widely accepted analysis
of simplicity has yet been found" (but see Elliott Sober's Simplicity,
Oxford U.P., 1975). Simplicity is many-faceted, or rather relative
to a profusion of respects; a theory may be simple in some various ways
and complex in others. But Goldman insists that simplicity (at all)
"should not be inserted into the pantheon of values for cognition in general."
Har. It would be amusing to see us try
to get along without appeal to simplicity (however tacit).
Explanatory inference is hardly limited to science. A detective solves
a murder case by reflecting on the various clues and constraints and arriving
at the best explanation of the clues given the constraints, the story that
makes the best sense of the clues. An auto mechanic diagnoses your
car trouble by inferring the best explanation of the car’s symptoms.
It may be tempting in such cases to say that the detective or the mechanic
has arrived at the "only possible" explanation and therefore has really
performed a deduction, by ruling out all the alternate possibilities (Sherlock
Holmes talked explicitly in this way). But that would not be accurate.
There are always many possibilities that have not been logically
ruled out by the evidence, but are just poor or outright fanciful explanations:
The murder might have been committed by a very small paratrooper who landed
silently in pre-dawn darkness on the garage roof and had some way of getting
through the window without breaking it, etc. Or it might have been
committed by invisible aliens. Or it might have been overdetermined:
the ordinary human murderer might have been accompanied by a Venusian superbeing
who simultaneously projected deadly thought waves to stop the victim's
heart. "The only possible explanation" has to mean just "the only even
halfway plausible explanation," and without exception, plausibility is
determined in part by simplicity. Only Occam's Razor rules out the
Venusian supernumerary.
Nor is explanatory inference limited to professional
practitioners such as detectives and mechanics. We all perform it
in everyday life as well. I find what appear to be droppings on my
lawn, and infer that an unleashed animal has been by. The last slice
of pizza has unexpectedly disappeared from the refrigerator, and I infer
that my daughter has stopped at home after school instead of proceeding
directly to her orchestra rehearsal. Some philosophers, notably Russell
and Quine, argue that our constant flood of beliefs about ordinary physical
objects in our environment is the result of constant explanatory inference
from the ways we are appeared to.
There is a general worry about the pragmatic
virtues, voiced very eloquently by Bas van Fraassen (in The Scientific
Image, Oxford: U.P., 1980): Aren't the explanatory virtues’ pragmatic
value just a mixture of corner-cutting convenience--really a form of epistemic
laziness--and merely aesthetic appeal? In curve-fitting, for example,
we prefer the smoothest hypothesis because the smooth curve both is easier
to draw and looks prettier. But why should anyone think that convenience
and prettiness count in any way toward truth? Why should a theory’s
being simpler than another theory make the first theory more likely to
be true, to match reality? (The Grecian Urn’s motto, that beauty
and truth are one, was just Keats running romantically out of control.)
And a related objection, raised by Ian Hacking
("Experimentation and Scientific Realism," Philosophical Topics
13: 71-88): Truth is a relation between a theory or hypothesis and
the world. But the pragmatic virtues are relations between theories
and our human minds, to which relations the world seems irrelevant. The
virtues have to do with the roles that hypotheses play in our private cognitive
economies, not with anything external to us. They are (in Hacking’s
phrase) only what make our minds feel good. The point is no longer
just to ask rhetorically why making our minds feel good should be taken
to be a warrant of truth; it is that the virtues are positively the wrong
sort of properties to be so taken. (This second argument is most
compelling for the case of conservativism. That a hypothesis fits
comfortably with what we already believe makes that hypothesis pleasant
and attractive to us, but, one might well think, hardly justifies it.)
Goldman does not voice either of these general
objections, but I suspect he is sympathetic. In any case, the two
are answered both in my book and in "Explanation and
Epistemology."
I still owe you some motivation for awarding
specifically epistemic value to the pragmatic virtues. I'll just
paste it in from "E&E":
There is an idea, emphasized by Reliabilists but
prevalent among epistemologists more generally, that ‘truth is the goal
of cognition,’ and hence that nothing should count as cognitive unless
it can be shown to be truth-conducive or at least is somehow directly
truth-conducive. But it is fairly easy to see that truth cannot be
the only epistemic value. Suppose it were. If the goal, like
Descartes’, is merely to avoid falsehood, then we could reach our ultimate
epistemic goal simply by confining our assent to tautologies; we would
still thereby believe uncountably many truths. If, instead, the idea
is to believe all truths, the goal would be radically unreachable.
Realizing those things, the truth-centered epistemologist usually alludes
to a ‘favorable balance of truth over error.’ But ‘favorable’ as
regards what? Some further value or interest must be consulted to
judge what is ‘favorable,’ or the suggestion is meaningless.
More specifically, it is hardly unreasonable to
suppose with Peirce that beliefs are for something, and that cognition
has a function. Truth cannot possibly be the only goal of cognition.
There must at least be something in the way of informativeness or other
usefulness, however that might be measured. Since belief is a guide
to action, a belief’s other pragmatic virtues may also contribute to its
overall cognitive goodness.
Lycan (J&J, Ch. 7) argues that the way
in which the pragmatic virtues do this is precisely by making cognition
efficient in guiding action. They are the product of good design
or ‘design’ by natural selection. A hyperskilled cognitive bioengineer
fitting human beings for a postPleistocene environment would, arguably,
have endowed us with the same habits of hypothesis preference as line up
with the pragmatic virtues. For example, she would have built us
to prefer (other things being equal, as always) simpler hypotheses to complex
ones. Simpler hypotheses are more efficient to work with. Complexities
incur greater risk of error in application. And for that matter,
simplicity is itself a form of efficiency, in that we want to achieve plenitude
of result, in the way of data subsumed and results predicted, but with
economy of means. For the same sorts of reason, the engineer would
program us to seek generality or explanatory power when other costs are
low.
The engineer would not want us to load up on beliefs
that have little or nothing to do with our immediate interactions with
our environment, unless those beliefs play an enormous unifying, simplifying
and systematizing role. Hence, she would have us prefer more readily
testable hypotheses to less testable ones.
Other things being equal, it would be more efficient
for us to be able to extrapolate a type of hypothesis motivated by one
subject-matter to other, not obviously related areas, so very likely the
engineer would have us seek fruitfulness. It is perhaps more obvious
that she would instill an aversion to messy belief systems full of dead
ends and paths that lead nowhere. If we think of belief systems as
maps or charts, clearly a neat one will allow us to find our way around
our environment more surefootedly than would a messy one. (But what
if the system has been made too neat, and contains inaccuracies?
The recommendation of neatness methodologically assumes, here as always,
that the system in question is unrefuted. Notice too that even in
fact, as in real-world cartography, accuracy should not always trump neatness;
some error is tolerable, even mandatory, in the interest of smooth and
fast action, if the particular error is unlikely to cause much trouble.)
Also, a particular belief that raises awkward questions thereby causes
distraction, sapping at least some time and mental energy.
Finally, the engineer would make us conservative,
at least to the minimal extent of not revising our beliefs without some
reason to do so. Like social change, all belief revision comes at
a price, drawing on energy and resources. Arbitrary and gratuitous
changes of belief, therefore, are to be avoided. If there were a
habit of making such changes, the resulting instability would be inefficient
if not constantly confusing.
Thus, from the design point of view, it seems to
be a good thing that we cognize according to the pragmatic virtues--conservativeness
included. We would not function at all well unless we did so.
(It must be emphasized that the Darwinized Peircean
view sketched in the preceding few paragraphs is not an attempt at justifying
appeal to the pragmatic virtues in any usual epistemic sense of ‘justify.’
The explanationist maintains that although the virtues are identified through
reflective equilibrium as basic cognitive values of ours, they are, thus,
basic; there is nothing that could justify them. The function of
our cognitive bioengineer story is only to rebut Hacking’s charge that
they are only mind candy, not cognitive in their value.)
A truth junkie such as Goldman or Simon might
well ask, "OK, so if truth is not the goal of cognition, then what (for
God's sake) is the goal of cognition?"
Steve Stich (in The Fragmentation of Reason,
not as Simon cites him Deconstructing the Mind) rejects the presupposition.
Why think that cognition has a goal at all? At least, why
think that cognition has any one single goal? Stich maintains that
the jumble of habits, methods and processes we collect under the term "cognition"
is just a bag of tricks bestowed on us by natural selection (and emphatically
a suboptimal one). The various habits etc. are vitally useful, all
right, but not in any one way. They serve various purposes on various
occasions, and the best an epistemologist can do is to write up a no doubt
complex natural history of that. Stich is thus a pragmatic pluralist,
or pluralistic pragmatist.
I myself am more of a monistic pragmatist.
First, in my Panglossian-Darwinian way I think the bottom-line goal of
cognition is reproductive fitness (what else?). But at the
common-sense level, prescinding from biological science, the goal of cognition
is effective action. We cognize in order to get by, to do
well, to pursue our own goals efficiently and successfully. Peirce
and Dewey got this exactly right. It's the American way.
What truth has to do with it is that true
beliefs usually conduce to effective action. (Though I don't
know how anyone could demonstrate that, however natural it is to believe.)
There may be a stronger, rule-utilitarian-type point to be made: Perhaps
adopting a rule, "Always pursue true beliefs no matter what," would conduce
to effective action. But so far as I can see, this instrumental type
of value is the only type of value true beliefs have. Truth is not
the goal of cognition. Effective action is.
Footnote
1 Though a sufficient weight of pragmatic virtue in a theory can
make us reject an apparently disconfirming observation as specious.
Recall curve-fitting in the chemistry lab.