Word Count: 2299
The following piece doesn't tackle David Chalmers' well-discussed and well-known Hard Problem. That is, it doesn't attempt to find an answer to the question:
i) Introduction
ii) Evolution: Why Consciousness?
iii) Consciousness is Good for Us
iv) Frank Jackson's Warm and Heavy Coat
v) Neuroscience on the Point of Consciousness
vi) Evolution and Panpsychism
vii) Conclusion
The following piece doesn't tackle David Chalmers' well-discussed and well-known Hard Problem. That is, it doesn't attempt to find an answer to the question:
Why does the
physical brain give rise to consciousness?
Instead, it asks us why we human beings - and other animals - needed
consciousness in the first place. Thus we have this question:
From
an evolutionary perspective, if the functions of the brain
(which Chalmers often refers to) might have occurred “in the dark”,
then why did we need (if we did need) - and why do we still need/have - consciousness?
The
nature of the physical-consciousness link is only tangential to this issue.
Evolution:
Why Consciousness?
Is
it really possible that experience/consciousness is truly gratuitous
from an evolutionary – or from any – point of view?
Thus perhaps the obvious answer to David Chalmers' question
“Why
is the performance of these functions accompanied by experience?”
is
that experience (or consciousness) may - or does
- contribute to these functions. It adds something.
The
most important point against the (possibly) adaptive nature of consciousness (i.e., how it may “increase fitness”) is an idea –
often stressed by Chalmers himself - that consciousness doesn't (or
may not) add anything to the brain functions which underpin it. In
other words, such brain functions may achieve the same advantages for survival even if higher organisms didn't have consciousness. This possibility clearly ties in with Chalmers' fixation on zombies. That is,
zombies have the same physical brains and mental functions as conscious human beings.
However, they're also “devoid of mentality”.
So
does consciousness or experience give us an evolutionary advantage? Or is consciousness/experience simply a redundant byproduct of other
things which did indeed give us an advantage? (Steven Jay Gould
called this kind of phenomenon a “spandrel”
- an unintended byproduct of something else.) Can we even conceive of the possibility that something that's so useful, immediate and particular as
consciousness is simply a byproduct of something else?
We can.
Perhaps
we shouldn't see the divide between x's
being advantageous and x's being disadvantageous in such absolute
terms. After all, it's also been said that the brain's big size and
weight weren't (really?) conducive to human survival. (More
precisely, the human brain is much bigger than all the other brains
in the mammalian species.) Nonetheless, a big consciousness and a big
set of cognitive skills are also a result of a big and heavy brain.
In
addition, if consciousness is an accidental byproduct (evolutionary
products, strictly speaking,
are also accidental) of other features which were indeed selected for
by evolution, then perhaps it can't be an adaptation either. Nonetheless, it may be what's called an “exaptive”
phenomenon. Consciousness might have been an exapation of other things which were indeed selected for by evolution. As just
stated, the brain's size and physical nature were selected for by
evolution. And one consequence of brain size and its physical/chemical
arrangement was consciousness/experience.
Despite
all this talk of consciousness being a byproduct of something else
(as well as talk of consciousness being pointless - if
only in evolutionary terms), we can also take a very different
position on all this, as Peter Carruthers does.
It's
not surprising that Peter Carruthers (i.e., as a philosopher) should
explicitly say that consciousness itself is conducive to survival and it is so in a strictly philosophical sense. Carruthers has
argued that consciousness allows us – and other beings – to "distinguish appearance from reality".
Now
what could be more conducive to survival than that useful philosophical skill?
We
can give a quick and easy example of this appearance-reality problem
for survival.
Take
the case of a very-hungry creature which was
able to work out whether or not the water he sees in the distance is
a mirage. If this creature hadn't had this evolutionary advantage, then
it might have wasted valuable time and energy traipsing towards non-existent water. It might have even died in the process.
If
we get back to Carruthers' philosophical Sahelanthropus man and other
philosophical creatures. Many philosophers have also said that “accurate representations” (Richard Rorty) - and even truth itself - were irrelevant when it came to survival. Though surely this can't apply to
Carruthers' mirage example!
Consciousness
is Good for Us
It
can be said that not all the brain's information-processing "goes on in the dark” because if it did so, then we wouldn't have the added
advantages that experience (or consciousness) give to these examples of information-processing. That means that Chalmers'
“inner feel”, for example, also contributes because it too is a
property of experience/consciousness.
The
fact still seems to be that because all of this could
occur in the dark, then we need to explain why it doesn't. Though, as
already stated, what if what occurs in the dark is at a lesser
(evolutionary) level than what occurs in the light? Indeed isn't that obviously the case? With,
say, microorganisms or even spiders, everything does (or may) occur
in the dark. With adult human beings, that's simply not the case. And that's why we live and experience at a higher evolutionary
level than microorganisms or spiders.
Despite the above, Chalmers himself writes:
“This
is not to say that experience has no function. Perhaps it will turn
out to play an important cognitive role.”
I
would say that it obviously does; especially from an evolutionary
perspective. There are indeed epiphenomenal attributes (or
hangers-on) when it comes to evolution. However, why should we
believe that consciousness/experience itself fits that bill? I don't see how experience could be like, say, a human's little toe: i.e., something that serves no purpose.
Having said that, just as all human beings have experiences, so too
do all humans have little toes.
Frank
Jackson's Warm and Heavy Coat
As
we've seen, it's certainly true that consciousness could be an
adjunct to physical features which were “conducive to survival” - without consciousness itself being conducive to survival.
This
is Frank Jackson (in his well-known paper 'Epiphenomenal
Qualia') on the subject of bears.
“The
Theory of Evolution explains this (we suppose) by pointing out that
[bears] having a thick, warm coat is conducive to survival in the
Arctic. But having a thick coat goes along with having a heavy coat,
and having a heavy coat is not conducive to survival. It slows the
animal down.
“… Having
a heavy coat is an unavoidable concomitant of having
a warm coat (in the
context, modern insulation was not available), and the advantages for
survival of having a warm coat outweighed the disadvantages of having
a heavy one. The point is that all we can extract from Darwin's
theory is that we should expect any evolved characteristic to be
either conducive to survival or a by-product of one that is so
conducive.”
There
are of course many other things which are deemed to be byproducts of
evolution. Perhaps a more
relevant example is the the blind spot in the retina. In this case, the blind spot wasn't an adaptation of the retina: it was
simply a byproduct of the way the retinal axons were/are wired.
There
are many other positions on the issue of consciousness being a
byproduct of something else. Steven Pinker (in his How
the Mind Works), for example,
argues
that consciousness is a byproduct of our our “evolved problem-solving abilities”.
So clearly consciousness might have been a byproduct of something else. However,
it's certainly not in the same ballpark as Frank Jackson's
warm-and-heavy coat. A heavy coat - in and of itself - was disadvantageous for a bear. A warm coat wasn't. When in comes to consciousness, we
can say that whatever it was that was responsible for consciousness - and from which consciousness is a byproduct - was also conducive to survival. However, it might have been the case that the
byproduct that is consciousness was also conducive to survival.
To return to Frank Jackson's warm-and-heavy coat example. Jackson concluded the quoted passage above by tying all this to qualia: He wrote:
“The phenomenalist holds that qualia fall into the latter category [i.e., an epiphenomenal byproduct or evolution].”
That
is, qualia are (or may be) a byproduct of evolution. It also follows
from this that they are – or may be - epiphenomenal. However, that
doesn't necessarily follow. Something that's an evolutionary byproduct needn't also be
epiphenomenal. Or, in our case, it needn't also be non-conducive to
survival. Sure, there's a mountain of philosophical arguments which have stated that
Jackson's qualia - and even consciousness itself - are epiphenomenal;
though this particular argument-from-evolution doesn't establish that.
Neuroscience
on the Point of Consciousness
It
may help to give some neuroscientific examples of this nonconscious/consciousness opposition (or distinction).
We
can say that actions (or movements) which are related to reflexes, vegetative
functions, low-level perceptual analyses, unconscious motor programs,
etc. all occur at the non-conscious level. However, clearly there are also
things
which are products of consciousness: perception, language, cognition, integration, memory, etc. However, even
some
of these examples could
still occur without consciousness. Thus we're left with two conclusions:
i) Nonconscious
processes occur.
ii) There are conscious processes; though they could
be - or might have been - nonconscious processes.
A
more down to earth – or neuroscientific – explanation of the
adaptive point of consciousness is the position that conscious states integrate neuronal activities and processes. This has been called “the
integration consensus”. A more technical variant on this has been
offered by Gerald Edelman. His “dynamic
core hypothesis” is about the “reentrant connections” which
link different areas of the brain in a “massively parallel manner”.
Nonetheless,
the autonomy-from-consciousness problem arises here too. It's certainly the case that there are kinds of information that are integrated without also being conscious. However, simply because
there is such nonconscious integration, that doesn't automatically mean
that conscious integration is ruled out of the picture. Clearly the two can stand side by side. It's still the case, however, that nonconscious processing creates philosophical and scientific problems
for the philosopher and scientist. Nonetheless, like the possibility of zombies, these problems don't - in and of themselves - logically or metaphysically rule out consciousness.
Thus it's certainly a fact that we don't always know which kinds of
information are integrated by consciousness and which aren't. However, that doesn't
have an impact on consciousness itself or even on its role in helping us survive.
Yes, there are indeed nonconscious functions or processes. So what?...
Yes, there are indeed nonconscious functions or processes. So what?...
Evolution
and Panpsychism
Chalmers
himself now fully accepts (I believe) some form of panpsychism.
The panpsychist position doesn't have it that consciousness/experience evolved from something else. It's been with us (or with the universe) since the very beginning - perhaps since just after the Big Bang. Thus the advantageous/not-advantageous-to-survival distinction doesn't seem to be that relevant in the case of panpsychism.
The panpsychist position doesn't have it that consciousness/experience evolved from something else. It's been with us (or with the universe) since the very beginning - perhaps since just after the Big Bang. Thus the advantageous/not-advantageous-to-survival distinction doesn't seem to be that relevant in the case of panpsychism.
Of
course it can also be said that even if panpsychism is true (and that
experience/consciousness has always been with us), then it may still be the
case that experience wasn't advantageous to survival. That is,
panpsychism doesn't seem to tie in very well with evolutionary theory; at least in this respect. If experience has always been with us (or
with the universe), then it can't have evolved to have given us an
evolutionary advantage.
Though
is it that simple?
Even if experience has always been with us, it might still have
been the case that evolution got to work (as it were) on it.
What I mean by this is that evolution changes biological matter.
According to panpsychism, all the parts of biological – as well as inanimate! - entities have consciousness/experience. However, evolution impacted on
the arrangements of biological entities so as to make some examples which were better equipped to survive than others. Thus those pockets of biological matter
which resulted would still have included phenomenal properties - all
the way down. Yet it might also have been the case that the new arrangements of matter (care-of evolution) brought
phenomenally-basic entities into new alignments which - being more
complex biologically and therefore phenomenally - made them better equipped to survive.
Thus,
depending on how we look at this, there are two possible responses to
this panpsychism-evolution situation:
i) If phenomenal
properties have always been with us, then that fact alone is hard to square with evolution.
ii) Even if experience has always been with us, then there's nothing to rule out the possibility that evolution itself might have had an impact on phenomenal properties (non-teleologically, of course) by making
them the parts of more complex biological entities. This would have made the aforesaid biological entities more phenomenally complex too.
Conclusion
To
repeat.
It's certainly possible that all the brain functions and processes (which David Chalmers often refers to) might well have occurred - and could still occur - “in the dark”. However, not all of them do occur in the dark. (As Philip Goff puts it: Consciousness is a primary "datum in its own right"; which - by definition - can't be ignored.)
As to how experience/consciousness is added to - or comes from - these functions (or from the brain itself), then that seems to be a different question. And it is indeed problematic and difficult.
It's certainly possible that all the brain functions and processes (which David Chalmers often refers to) might well have occurred - and could still occur - “in the dark”. However, not all of them do occur in the dark. (As Philip Goff puts it: Consciousness is a primary "datum in its own right"; which - by definition - can't be ignored.)
As to how experience/consciousness is added to - or comes from - these functions (or from the brain itself), then that seems to be a different question. And it is indeed problematic and difficult.
However,
if the evolutionary approach sketched above is broadly correct, then Chalmers'
Hard Problem doesn't (or perhaps shouldn't) bring forth the following why-question:
Why does the
physical brain give rise to consciousness?
Instead it
simply raises (or perhaps should raise) the following how-question:
How does the
physical brain give rise to consciousness?
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