From
the Journal of Neuro
Aesthetics

CHARLES WOLFE on
PROPRIOCEPTION
Charles
Wolfe
Proprioception: from
"proprius-ception,
‘one's own’ ception (...) the 'body' itself as, by movement
of its own tissues, giving the data of,
depth"
(Charles Olson,
"Proprioception")
Up until now, it has not
proved common in philosophy for readers to experience the
breathless rush through sensory landscapes one finds in
novels by William Gibson, or better, Jeff Noon
(Vurt,
Pollen).
Philosophers of most stripes like to recapitulate; to
reconstruct a context; to take you back a few steps in time
and show you the emergence of an idea. Granted, there have
been a few books in recent years coming out of the
phenomenological tradition which emphasize the most
physical
(embodied,
carnal, corporeal, fleshly, perceptual, etc.) elements of
that tradition. The relevant names here are Merleau-Ponty,
and before him Husserl and Kurt Goldstein, whose
fascinating book The
Organism has recently been reissued
by Zone Books. (Thinkers who seek to emphasize the
materiality or concreteness of social
relations,
that is, the primacy of the social world in structuring our
consciousness of self, will instead invoke Heidegger, who
has been translated into the American idiom, or should one
say Californian, by people like J. Searle over the last
15-20 years: no part of human action can be understood in
isolation from the "Background." But here we are concerned
with the body and its environment, rather than society and
the self.) But nonetheless, ever since Kant, in
Dreams of
a Spirit-Seer, reproached Swedenborg
for trying to build a philosophy on private experience,
whether mystical or hallucinatory, philosophers have shied
away from the 'kaleidoscope' approach. Well, Andy
Clark's Being
There (subtitled
Putting
Brain, Body and World Back Together) puts the aforementioned
novels to shame. We move at lightning speed through
Artificial Life robotics, Gibsonian perception studies,
Scott Kelso's dynamic systems models, the slime mold ...
all of this glazed over or dusted with a fine sheen
of dernier
cri phenomenological
utterances. The title, Being
There, would hopefully not be
allowed outside of MIT's cognitive science series, and its
cheerful cult of bad taste. What I'll be trying to do here
is to talk a leaf out of Clark's book and argue for the
priority of bodily reality in understanding brain and mind.
Why proprioception? Isn't
it a mere physical feature of the working of our organism,
like metabolism? Well, if we are interested in thinking
through the body, as a critic once put it, we must care
about the ways in which the body is radically
non-Cartesian, that is, the way in which it can
talk
to itself
without having to retreat into a state prior to any body or
world. Knowledge in the Cartesian view only begins after we
have eliminated all physical determinants through a process
of doubt. The view I am associating with "proprioception"
has been taken by a variety of thinkers, including Maurice
Merleau-Ponty, J.J. Gibson, and most recently Andy Clark:
"the body is a great system of reasons, a war and a peace
..." (Nietzsche, Thus Spoke
Zarathustra). The word itself was
first used in this illustrative sense, rather than as the
sole concern of physical therapists, by the poets Ezra
Pound and Charles Olson. Olson was dean of Black Mountain
College, author of Call me
Ishmael, The Maximus
Poems, and many other pieces of
"projective verse," as well as the prose collection
entitled Human
Universe, which includes "The
Resistance," in which our theme of the primacy of the body
is sounded with ethical
overtones --
quite reminiscent of what Foucault expressed a few years
later: the last threshold of resistance I have is my body.
Ethico-political norms can only be evaluated in accordance
with what is tolerable or intolerable for my body. But to
return to proprioception, here is how Olson defines
it:
The data of depth sensibility / The 'body' of us as
object which spontaneously (...) produces experience of,
"Depth," viz. SENSIBILITY WITHIN THE ORGANISM BY MOVEMENT
OF ITS OWN TISSUES.
He speaks of the body as a
cavity, an "interior empty place filled with 'organs'? for
'functions'?", and explains, in very Germanic accents, that
it "removes the false opposition of 'consciousness'" (p.
182). Andy Clark, neurophilosopher from Washington
University, gives a shorter definition of proprioception as
"the inner sense that tells you how your body is located in
space" (Being
There, p. 22).
Here, the word
'proprioception' will serve as a short-hand designation
for the priority of
dynamic embodied activity over isolated 'mental' and
'physical' regions. Rather than asking "How
can a brain accomplish reasoning?", the question becomes
"How can a brain have experiences?", that is, "What is it
like for a brain to be embodied?".
Rodney Brooks' Artificial
Life movement at MIT has produced odd mobile robots called
Creatures. We can learn from these creatures and the
cockroach robots of Beer and Chiel described in
Clark's Being
There that cognitivist
architectures moved too far away from biological
inspirations, including the capacity of biological
cognition to adjust to new environments. As the brain does
not produce output in the way traditional machines do ("the
principal activities of brains are making changes in
themselves"), it is self-modifying, unlike the standard
idea of an organ which exists to represent
external
states. Rather, the world is itself present in processes of
self-modification. For New Roboticists, this means
that representation is the
wrong unit of abstraction in building the bulkiest parts of
intelligent systems, as Rodney Brooks puts
it. For us, this will become a crucial part of the
standpoint called "proprioception." Even a classic
neuroanatomical paper such as Lettvin et
al.'s "What the Frog's Eye
Tells the Frog's Brain" already states that "the eye speaks
to the brain in a language already highly organized and
interpreted, instead of transmitting some more or less
accurate copy of the distribution of light on the
receptors" (p. 1950). The information circulating in the
brain is not reducible to some raw features of the external
world which are then turned into faithful copies or
representations. The brain is always already a part of the
physical (bodily) and social world. Let's turn for a moment
to the brain's skillful behavior in the
world.
Biological agents always know very little at a time;
they infer
a great deal
(famous examples include reaching for a cup, or assuming
what the trajectory of a ball coming towards us will be,
rather than making the actual calculation in our head).
J.J. Gibson's notion of "affordances" implies that an
object contains an infinite amount of information, since it
is different for each perceiving individual; Walter Freeman
speaks of humans as finite-state
devices, and often emphasizes our
incapacity to comprehend infinity. Conscious mental states
possess intentionality, the faculty of being 'about'
something, and thus the substrate of these states, the
brain, is more than an organ for rapidly initiating the
next move in a real-world situation, as Clark would put it,
just as the lived time and historical nature of an organism
is more than the sum of its adaptive responses. Skill is a
revealing case of how we deal with challenges from the
environment, mobilizing our resources in real time. It
escapes some difficulties of the model of thinking as the
manipulation of discrete quantities of information by means
of symbols, both because "the world is its own best
representation" (Rodney Brooks, quoted by Clark, p. 46),
i.e., it bypasses a system of representations for the sake
of speed,
and because our brain has the talent for making use of the
environment, "'piggy-backing on reliable environmental
properties" (ibid.,
p. 45), for the sake of economy.
"Scaffolding" is one of the vehicles humans employ, so that
language, culture and institutions empower
cognitions
(Clark, pp. 21, 87). However, the human brain
does
integrate
information. Proprioception itself, e.g. one's hand
reaching for an object without having to calculate all
variables of the trajectory (an example used both by
McClelland et
al. and Clark, p. 22), is
the manipulation, re-shaping, and taking in of information.
The brain is not the "central planner" but possesses a
"scaffolding" which is inseparable from the external
world.
II.
If proprioception is a code word for the way in which our
brain is inextricably part of our body, which in turn is a
dynamic sensory system interacting with the world and
producing a 'customized' environment (von Uexk¸ll's
Umwelt,
the specific environment which belongs uniquely to each
species: the world of the fly, of the bat, of the human
...), what about consciousness? It is quite possible to
maintain that consciousness is a biological
property of the brain (in humans and certain
other animals) without
believing it
has to be naturalized,
forced into categories we would use strictly for the
natural world (physical, spatio-temporal, causally closed).
Precisely, there is no need to naturalize it, Searle would
say: it already is
natural. This would be like
"seeking to electrify electricity." But notice the problem:
if consciousness is indeed such a natural entity, then it
can be studied like any other biological process. Yet for
an organism to possess mental functions, it needs to be
able to distinguish representational states from the
objects stated, doesn't it? Isn't there a level of
performance which is distinct from the strictly biological
one? Or is this a way of falling back into a
representational understanding of the way the mind works?
The physical substrate of consciousness is entirely
amenable to (neuro)biological study, let's not deny it; but
is consciousness itself also thereby amenable to the same
study? "Wait!", you'll say: "weren't you denying naÔve
idealism and its claims to an autonomy of consciousness, as
a kind of mysterious substance that hovers above and around
the physical, causal world? Are you saying that thought or
behavior can occur independently of physico-chemical
changes in the nervous system?" No. The point is to
emphasize that the brain is context-bound by the physical
(bodily) and social worlds within which it finds itself.
"Further problem!", you say. "If we claim that knowledge is
socially constructed, and that the world as
made
by humans is
actually the only world to which we have
access
as humans
(barring possibilities of an artistic 'investigation' of
sub-rational, perceptual zones, such as in Op Art), do we
then toss biological explanations (explanations appealing
to the features of our organic
life) out the
window?" No: symbolic activity is a constitutive feature of
human embodied minds: "we may be even more symbolic animals
than we are visual animals," says the psychologist Michael
Posner.
If we say: the mind is
embodied, perception is also
proprioception, we are saying that the
texture of the physical world is an irreducible component
of brain-mind activity. It cannot be "reduced" in the sense
of chemical purification to a pure consciousness; and it
cannot be "reduced" to a more
physical level in which
action
itself is not
present. (Speaking philosophically, at least, in actual
neuroscience, a specialist of perception like William
Newsome can be agnostic about the existence of Barlowian
'grandmother' neurons, i.e. the possibility of identifying
isolated neurons as "critical signaling units [which]
govern performance," emphasize distributed cognition and
redundancy, but nonetheless maintain that cognition is
fundamentally "computations executed in parallel and in
sequence within real neural pathways," such that cognition
can be explained by studying these computations. But in a
remarkable turnaround, after having given us as good a
version of computational 'reductionism' as we can find,
Newsome says that the monkey's internal
experience is crucial for
understanding the nervous system functions. It is not good
enough to provide an external
account
relying on causes and effects in central neural
pathways.)
Let's say this another way: it is extremely valuable to
prove that a computer can fulfill various key tasks which
we previously thought were the exclusive prerogative of our
minds. Our minds are, among other things, calculators and
chess-playing machines. To demonstrate that
computers can do
what we can do
in this sense is an admirable project of demystification --
one might even say, of secularization
! -- but
it completely abstracts
from the biological embodiment of these algorithmic
processes. I enjoy declaring that
"a cruise missile has intentionality," but in fact the
truly exciting statement is that the mind is
embodied,
part of our organic functioning just as much as eating,
digesting, and other such functions. To declare that
consciousness is an organic function like any other does,
however, run into certain problems when it comes to
ontology. Consciousness is always consciousness
of
something; if
we say that hearts, livers, and other organs are also
possessed of 'information about X' then we would have to
grant them consciousness (as David Chalmers does in
The
Conscious Mind (Oxford, 1996), a book
ably dispatched by Searle). To justify the way in
which we
relate to this
'aboutness' of consciousness we can't just provide
biological explanations. However, this does not
affect the position of 'embodied
cognition' or 'incarnation' (here termed "proprioception"),
since the debate on the existence of consciousness is
an ontological
one, unlike
our descriptive
or
methodological
stance. When
the issue is ontology, we can understand why Dennett finds
it necessary to explain consciousness by means of
properties which are not themselves 'conscious': "has
liquidity been explained away by the physicists because
(...) they don't attribute liquidity to anything at the
atomic level? The physicists have left out the wetness, and
I've left out the qualia." (Qualia being all that is
subjective about my experience, and yet somehow 'real':
classic examples are the experience of color,
and pain.)
For Searle, there still is
consciousness,
and he would find it silly to deny its existence. For
Dennett, what is true is what can be scientifically
investigated, and the latter investigations can only take
place from the third-person
perspective. What is only real
to
me cannot be real for
science. Searle's response to this amounts to a digest of
phenomenological investigations into the reality of
consciousness, a.k.a. "intentionality," for the past
century. In the realm of the mental, he will say,
appearances are what
is real. (Not just any
appearances, but my
appearances.)
We seem far from proprioception now, and indeed Searle is
at best a fellow-traveller in our inquiry: we agree as to
the priority of the biological, and we agree that human
reality cannot be divorced from the natural world, but for
the topic of how 'incarnation'
provides a more workable model of understanding mind, brain
and body in interaction, Searle has little to say. The most
influential book here, which still repays some study, is
Hubert Dreyfus' What Computers Can't
Do.
II.
If perception includes
sensory-motor acts in such a way as to include our body
itself, conversely, we must think of the body so as not to
exclude its subjectivity,
what Merleau-Ponty, in the Phenomenology of
Perception, called one's "corps
propre," the sense that one's body is one's
own.
My
lived history
as an active individual, as an organism with a certain
intake of meat and nicotine and alcohol within specific
cultural boundaries, is not merely the development of the
set of frozen boundary conditions which comprise my
individuality physically, from electrons and protons to
atoms to molecules to my genetic make-up. It also includes
what Searle calls a Background, a "scaffolding" which is
partly tied to my own perceptual make-up (Gibson's
"affordances," more or less). My experience has accumulated
to form part of my cognitive horizon. Clark adds one twist
on this: "the constraints of evolutionary holism" (p. 89),
i.e., the way in which I evolve as a series of responses to
environmental challenges. One can push this a final step
further and say that biologically speaking, an organism is
historical inasmuch as it cannot be fully understood in
abstraction from its 'prehistory', including its heredity.
The history of my organism is not just the sum of the
situations it faced and the solutions it found through
adaptation (or skill). This is still a strictly
spatial
understanding,
and the organism is truly a time-bound entity, with what
the cognitive scientists call "time-critical behavior." As
Simondon puts it, each organic act presents a temporal
structure which is adequate to a given situation.
Time to conclude. The body
which I experience is always my
body, regardless of
prostheses, hallucinations, etc.; experience is
always my
experience. In
proprioception, I have an inner sense of how the various
parts of my body 'communicate' among one other (cf.
neurological interest in "body images," the well-known
phenomenon of 'phantom limbs', etc.), but also a projection
towards the physical world around me, all at once. To
understand what it means to think, to compute information,
to have a trillion neurons firing in my brain, to have
consciousness either at a 40 Hz frequency (F. Crick) or at
the quantum level (Penrose), one must really understand
this: it's all about bodily
sensation. Earlier, I had praised
the computational model for having demystified the
'sanctum' of brain and cognition; now I can add Feuerbach's
immortal words: "The sense of touch is atheist from birth":
our faculty of sensing, of which touch is a particular
case, constructs the world for itself. The world is not
pre-given by a divinity, or by a rational re-construction,
a 'set of instructions' in the current vocabulary. "Vision
and touch are not reason's 'raw material', its substrate,
but rather the essence of the fully realized human relation
to reality." Call it what you will: touch, sensation,
embodiment, incarnation; the brain in its bodily context
"creates chaotic activity to make sense of the world" (in
Freeman and Skarda's phrase), and thus it makes the
world its
own.
