There are two kinds
of anti-reductionisms about the mind. One is methodological in which
one is skeptical that a reductive theory of the mind can be produced
about the mind given the limits of science. The other is metaphysical
anti-reductionism which commits to mental kinds not being
type-identical to the canonical language of physics. One need not
commit to metaphysical anti-reductionism to be a methodological
anti-reductionist, and I think we should be only methodological
anti-reductionists.
Metaphysical
anti-reductionism is not a tenable theory because the arguments for
it are not sound enough to sufficiently demonstrate that we ought to
believe that the mind is not physical. Methodological
anti-reductionism is more tenable thesis given the limits of using
testimony to construct either computational, causal, or neurological
identities. To represent arguments for methodological
anti-reductionism will be Thomas Nagel's “What Is It Like To Be A
Bat?” and to represent arguments for metaphysical anti-reductionism
is Frank Jackson's “Epiphenomenal Qualia.” While the arguments
covered here are not nearly all of them, the arguments in both works
have played a fundamental role in constructing the frame of the
debate between reductionists and anti-reductionists.
In “What Is It
Like To Be A Bat?”, Nagel argues the essential part of the
mind-body problem is consciousness (322). He claims that 'without
consciousness the mind-body problem would be much less interesting
[and] with the mind-body it seems hopeless” (322). By hopeless,
Nagel is referring to the reason that reductionist theories “do not
even try to explain [consciousness]” (322). He rightly claims that
a complete theory of mind could not “exclude the phenomenological”
and “if physicalism is to be defended, the phenomenological
features must themselves be given a physical account” (323). Brian
Cooney explains that, by phenomenological, Nagel means “the way
that an object appears, is experienced or perceived; the way
something is for a conscious subject” (323).
Early in Nagel's
paper, Nagel concludes from the modal argument and the
what-it-is-like-to-be argument that the subjective character of
experience is not captured in any of the familiar reductive theories
(323). In other words, he concludes that the subjective character
cannot be analyzed in terms of functional (or intentional) states or
causal roles because the physical theories are compatible with the
absence of the mental (323). He also articulates the intuition, which
drives this anti-reductionism, that to talk about mind objectively
seems to eliminate the subjective, which was the essential
feature any complete theory of mind is attempting to explain.
Later in his paper,
Nagel admits to the possibility of a reduction and reveals himself to
not be a metaphysical reductionist. First, he claims that the
external world is the essence of the internal world, not merely a
point of view of it (327). This implies that Nagel thinks that the
mind depends on a real and existing world to exist. While this does not
mean he is making type-identities with specific physical things, it
commits him to at least a weak supervenience thesis. Second, he
claims that the current concepts do not provide an account of how a
reduction of the subjective to the objective may be done (327). This
implies that Nagel leaves open the route that it may indeed be
possible to create a physicalist theory of the subjective. This seems
to contradict his earlier statement about the nature of objective
explanations necessarily failing to explain the subjective, but
because Nagel uses the word 'seems,' he was not absolute in that
stance. Third, Nagel claims that the inadequacy of physicalist
hypotheses do not justify the conclusion that physicalism is
necessarily false (328). Because Nagel allows for the possibility of
metaphysical reductionism but provides skeptical arguments to at
least the current reductive programs, he is an example of a
methodological anti-reductionism.
While I think that
methodological anti-reductionism is reasonable currently, there is
significant arguments against it. I can hardly cover all of them
here, but I will cover the three most significant. The first is the
explanatory argument. It is the strongest in my opinion and is the
reason I am not a metaphysical reductionist. The explanatory argument
is that there are certain questions about the nature of the mind that
are sufficiently explained by an identity or functional thesis. The
reason that a relationship holds between two mental states is
explained by the same reason that a relationship holds between two
physical states. The reason I have a mental state rather than another
person is explained by the fact that the mental state has something
to do with physical location of my parts which other people do not
have. The reason that mental events happen simultaneously with
physical states rather than after or before physical states is
because they are identical with at least something about physical
states.
The problem with
the explanatory argument for reductionism is demonstrated by Nagel's
modal argument. Basically, if we can conceive of a person with
identical physical facts as we but lacking a mind, we have not
sufficiently explained mental events with physical events. As long as
the physical theories of minds are compatible with its absence, it is
not really a theory of mind but merely a theory of brains or
computers. The modal argument does not mean that reductionism is
false, but it challenges that these theories have discovered
type-identities for mental kinds in the physical. The type-identity
is essential part of many reductions because type-identity is a
discovery of the essence of something. If one discovers the essence
of something, that holds in all possible worlds. Nagel is right that
we have not reach the point in which we can say that we have
discovered the nature of the phenomenological, but he leaves it open
that we might develop concepts that will make a reduction possible.
The second argument
for reductionism is an induction from the history of successful
reductions. Scientists reduced heat to mean kinetic energy, life to
biological processes, fire to combustion, etc.... The argument is
that there is no reason to believe that the mind cannot be reduced in
the same way. Those who conservatively hold to the old dualistic
intuitions are foolishly holding to a kind of thought that has been
wrong about so many things like the nature of mental illness, sleep,
and learning (Churchland 132). We should therefore feel confident in
our our physicalism about mental states.
The weakness with
this inductive argument is that this kind of reduction is not
identical to past reductions. Past reductions have always been
objective-to-objective, not subjective-to-objective. While there is a
phenomenological quality to heat, what we are trying to explain when
reducing heat to mean kinetic energy is its objective character. This
does not mean there is not an objective story that separates our
brains processing of sense data from the external referrant like
light frequency, but rather that the subjective character is
incompatible with current physicalist reductions, as Nagel suggests.
The third argument
is that qualia are not essential to mental states. Paul and Pat
Churchland argue this in their response to the inverted spectrum
argument in “Functionalism, Qualia, and Intentionality.” They
argue that when we are talking about the mental state red, how we
experience it is not essential in our description. They use a tiger
for an example. While the tiger is initially discriminated by its
black stripes and yellow fur, there are also albino tigers
(Churchland 351). If the phenomenological character were different,
the functional role would remain the same for tigers. In other words,
“sameness of functional role dominates over differences in
qualitative character” (Churchland 352).
This argument is
sufficient to explain our mental reference but it is not enough to
rid the subjective character's existence from the equation. What
makes the mind interesting is not this functioning but the subjective
character. Even if we could provide a complete story of the mind in
terms of functioning or identities, we would leave the question of
'what are qualia.' They seem to be more than functional because, so
conceived, they are only contingently connected with functional
roles, hence the non-essential role they play in mental states.
What demonstrates
the importance of qualia to our understanding of consciousness is
contained in the What-it-is-like-to-be argument. Nagel argues that no
amount of physical information about bats can enable us to imagine
what it is like to be a bat. When we imagine echo-location, we are
just humans imagining we are bats, not actually being bats. While
this argument relies on pointing out physical differences (e.g.
between bats and humans), it clearly demonstrates that there is
something worth explaining (e.g. what-it-is-like-to-be) that cannot
be explained physically as of yet.
Given that we are
methodologically prevented from making reductions, at least
currently, are we justified in being meta-physical anti-reductionists
about qualia? Frank Jackson in “Epiphenomenal Qualia” thinks so.
He covers many of the same arguments as Nagel, so I will not repeat
those here. I will focus on his strongest and most famous argument
for metaphysical anti-reductionism, the Mary argument, and the
explanatory argument for epiphenomenalism, which is not explicitly in
his paper.
The Mary argument
hinges on Mary learning a new fact when she experiences red after
knowing the complete reductionist theory. Mary is a neuroscientist in
a black and white room with a black and white television (Jackson
344). She has never seen the color read. She knows all the physical
facts about what happens when a person testifies experiencing red in
his or her brain (Jackson 344). When she leaves the room, she
experiences the color red and learns what it is like to experience
red like those who testified about the experience in her books. In
other words, she learned a fact about everyone who experienced red.
If she knew all the physical facts but still learned a new fact, that
logically entails that she learned a non-physical fact. If there are
non-physical facts, physicalism is false.
The best
counter-argument is that Mary is not learning a new fact but is
learning her relation to others experiences. John Perry in “Time,
Consciousness and the Knowledge Argument” explains with a metaphor
to a map. The idea that Perry is drawing upon comes from D. H.
Mellor's “McTaggart, Fixity and Coming True.” Mellor argued that
since the question “What time is it now?” is a relational
statement between when the statement is uttered and the event of a
certain time designation like May 1984 (70). Perry takes this and
with an in-between metaphor about location. He nicely demonstrates
that Mary's knowledge about the relation between her experience and
everyone’s experience is not a discovery of something knew about
the world.
The in-between
metaphor uses location. Larry has a map. He knows that Salt Lake City
is west of Little America. When he sees that he is at Little America,
he can use the demonstrative 'here' and say Salt Lake City is west of
here” (Perry 78). Larry did not learn a new fact about geography.
There is nothing new about 'here' because 'here' in this context is
Little America.
The same can be
said of Mary. Mary like Larry only learned that she that her brain
was having a neurological process. Nothing changed about the factual
nature of seeing red, but rather that Mary was now in the seeing
relation to red. Since Mary is not learning a new fact, we cannot say
there must be non-physical facts, so the argument fails. This does
not mean necessarily there is no non-physical facts just that we
cannot conclude from this argument that there are.
As for Jackson's
other arguments, I have covered them already. Despite what Jackson
says, the Fred argument is identical to the
what-it-is-like-to-be-a-bat argument from Nagel; the only difference
is that Fred sees two distinct forms of red and bats have
echolocation. Just as we cannot imagine what Fred's experience is
like we cannot imagine bats and our physical explorations do not give
us access to it. The Modal argument also does not provide definitive
answer as to the nature of the qualia. If qualia end up being
type-identical with something physical, the argument is moot.
Without the Mary
argument, the only thing left is to attempt to explain why it is
impossible to explain qualia. The explanation an epiphenomenologist
would use is not that there is a deficiency of our scientific
methodology but rather that qualia are in fact not physical. This,
however, falls into the trap of an argument from ignorance. 'I cannot
understand through reduction; therefore, a non-reductive explanation
is true.' This is a common move for arguments for other supernatural
entities. Just as it is wrong to use a god-of-the-gap argument it is
wrong to posit an epiphenomenal realm to explain our ignorance of the
mind. What we should be is agnostic about the nature of the mind, and
only methodological anti-reductionists until we find a way of knowing
this part of the mind.
Works Cited:
Churchland, Pat. Churchland Paul.
“Functionalism, Qualia, and Intentionality.”The Place
of the Mind. ed. By Brian
Cooney. Australia; Wadsworth Cengage Learning: 2000.
Churchland, Paul. “Eliminative
Materialism.” The Place of the Mind.
ed. By Brian Cooney. Australia; Wadsworth Cengage Learning: 2000.
Jackson, Frank. “Epiphenomenal
Qualia.” The Place of the Mind.
ed. By Brian Cooney. Australia; Wadsworth Cengage Learning: 2000.
Mellor, D. H. “McTaggart, Fixity,
and Coming True.” Metaphysics: Classic And Contemporary
Readings. ed. by Ronald C. Hoy
and L. Nathan Oaklander. 2nd
Edition. Australia; Thomson Wadswoth: 2005.
Nagel. Thomas. “What Is It Like To
Be A Bat?” The Place of the Mind.
ed. By Brian Cooney. Australia; Wadsworth Cengage Learning: 2000.
Perry, John. “Time, Consciousness
and the Knowledge Argument.” Metaphysics: Classic And
Contemporary Readings. ed. by
Ronald C. Hoy and L. Nathan Oaklander. 2nd
Edition. Australia; Thomson Wadswoth: 2005.