Monkeys experience binocular rivalry. They can learn to press a button every time their perception flips, while their brains are impaled with electrodes that record any change in activity. Neuroscientist Nikos Logothetis found that the earliest way stations for visual input in the back of the brain barely budged as the monkeys' consciousness flipped from one state to another. Instead, it was a region that sits further down the information stream and that registers coherent shapes and objects that tracks the monkeys' awareness. Now this doesn't mean that this place on the underside of the brain is the TV screen of consciousness. What it means, according to a theory by Crick and his collaborator Christof Koch, is that consciousness resides only in the "higher" parts of the brain that are connected to circuits for emotion and decision making, just what one would expect from the blackboard metaphor.
WAVES OF BRAIN
CONSCIOUSNESS IN THE BRAIN CAN BE TRACKED NOT JUST IN SPACE but also in time. Neuroscientists have long known that consciousness depends on certain frequencies of oscillation in the electroencephalograph (EEG). These brain waves consist of loops of activation between the cortex (the wrinkled surface of the brain) and the thalamus (the cluster of hubs at the center that serve as input-output relay stations). Large, slow, regular waves signal a coma, anesthesia or a dreamless sleep; smaller, faster, spikier ones correspond to being awake and alert. These waves are not like the useless hum from a noisy appliance but may allow consciousness to do its job in the brain. They may bind the activity in far-flung regions (one for color, another for shape, a third for motion) into a coherent conscious experience, a bit like radio transmitters and receivers tuned to the same frequency. Sure enough, when two patterns compete for awareness in a binocular-rivalry display, the neurons representing the eye that is "winning" the competition oscillate in synchrony, while the ones representing the eye that is suppressed fall out of synch.
So neuroscientists are well on the way to identifying the neural correlates of consciousness, a part of the Easy Problem. But what about explaining how these events actually cause consciousness in the sense of inner experience--the Hard Problem?
TACKLING THE HARD PROBLEM
TO APPRECIATE THE HARDNESS OF THE HARD PROBLEM, CONSIDER how you could ever know whether you see colors the same way that I do. Sure, you and I both call grass green, but perhaps you see grass as having the color that I would describe, if I were in your shoes, as purple. Or ponder whether there could be a true zombie--a being who acts just like you or me but in whom there is no self actually feeling anything. This was the crux of a Star Trek plot in which officials wanted to reverse-engineer Lieut. Commander Data, and a furious debate erupted as to whether this was merely dismantling a machine or snuffing out a sentient life.
No one knows what to do with the Hard Problem. Some people may see it as an opening to sneak the soul back in, but this just relabels the mystery of "consciousness" as the mystery of "the soul"--a word game that provides no insight.
Many philosophers, like Daniel Dennett, deny that the Hard Problem exists at all. Speculating about zombies and inverted colors is a waste of time, they say, because nothing could ever settle the issue one way or another. Anything you could do to understand consciousness--like finding out what wavelengths make people see green or how similar they say it is to blue, or what emotions they associate with it--boils down to information processing in the brain and thus gets sucked back into the Easy Problem, leaving nothing else to explain. Most people react to this argument with incredulity because it seems to deny the ultimate undeniable fact: our own experience.
The most popular attitude to the Hard Problem among neuroscientists is that it remains unsolved for now but will eventually succumb to research that chips away at the Easy Problem. Others are skeptical about this cheery optimism because none of the inroads into the Easy Problem brings a solution to the Hard Problem even a bit closer. Identifying awareness with brain physiology, they say, is a kind of "meat chauvinism" that would dogmatically deny consciousness to Lieut. Commander Data just because he doesn't have the soft tissue of a human brain. Identifying it with information processing would go too far in the other direction and grant a simple consciousness to thermostats and calculators--a leap that most people find hard to stomach. Some mavericks, like the mathematician Roger Penrose, suggest the answer might someday be found in quantum mechanics. But to my ear, this amounts to the feeling that quantum mechanics sure is weird, and consciousness sure is weird, so maybe quantum mechanics can explain consciousness.
And then there is the theory put forward by philosopher Colin McGinn that our vertigo when pondering the Hard Problem is itself a quirk of our brains. The brain is a product of evolution, and just as animal brains have their limitations, we have ours. Our brains can't hold a hundred numbers in memory, can't visualize seven-dimensional space and perhaps can't intuitively grasp why neural information processing observed from the outside should give rise to subjective experience on the inside. This is where I place my bet, though I admit that the theory could be demolished when an unborn genius--a Darwin or Einstein of consciousness--comes up with a flabbergasting new idea that suddenly makes it all clear to us.
Whatever the solutions to the Easy and Hard problems turn out to be, few scientists doubt that they will locate consciousness in the activity of the brain. For many nonscientists, this is a terrifying prospect. Not only does it strangle the hope that we might survive the death of our bodies, but it also seems to undermine the notion that we are free agents responsible for our choices--not just in this lifetime but also in a life to come. In his millennial essay "Sorry, but Your Soul Just Died," Tom Wolfe worried that when science has killed the soul, "the lurid carnival that will ensue may make the phrase 'the total eclipse of all values' seem tame."
TOWARD A NEW MORALITY
MY OWN VIEW IS THAT THIS IS backward: the biology of consciousness offers a sounder basis for morality than the unprovable dogma of an immortal soul. It's not just that an understanding of the physiology of consciousness will reduce human suffering through new treatments for pain and depression. That understanding can also force us to recognize the interests of other beings--the core of morality.
As every student in Philosophy 101 learns, nothing can force me to believe that anyone except me is conscious. This power to deny that other people have feelings is not just an academic exercise but an all-too-common vice, as we see in the long history of human cruelty. Yet once we realize that our own consciousness is a product of our brains and that other people have brains like ours, a denial of other people's sentience becomes ludicrous. "Hath not a Jew eyes?" asked Shylock. Today the question is more pointed: Hath not a Jew--or an Arab, or an African, or a baby, or a dog--a cerebral cortex and a thalamus? The undeniable fact that we are all made of the same neural flesh makes it impossible to deny our common capacity to suffer.
And when you think about it, the doctrine of a life-to-come is not such an uplifting idea after all because it necessarily devalues life on earth. Just remember the most famous people in recent memory who acted in expectation of a reward in the hereafter: the conspirators who hijacked the airliners on 9/11.
Think, too, about why we sometimes remind ourselves that "life is short." It is an impetus to extend a gesture of affection to a loved one, to bury the hatchet in a pointless dispute, to use time productively rather than squander it. I would argue that nothing gives life more purpose than the realization that every moment of consciousness is a precious and fragile gift.
Steven Pinker is Johnstone Professor of Psychology at Harvard and the author of The Language Instinct, How the Mind Works and The Blank Slate
Is there a cliff note version of this post available?
"The spiritual force transcends all. -- I feel this great creative and spiritual force within me that is greater than faith, greater than ambition, greater than confidence, greater than determination, greater than vision. It is all these combined. My brain becomes magnetized with this dominating force which I hold in my hand". Bruce Lee
Yet, he fails to include "passion" in his list of things that are transcended by spiritual force. His list includes:
faith -religion
ambition -goal setting
confidence -belief in one's own abilities
determination -will to follow through
But, passion is a different thing altogether. And I think he just didn't know how to explain it. Men have a hard time discussing their feelings. He feels passionate about martial arts, but he wants to call it "spiritual force" because he doesn't know how to articulate his feelings. To him, it's a vauge concept that can only be encapsulated by an equally vague term.
there is proof of intelligent design all around us!!do you really think this all started with the "big bang"????
There's actually quite a bit of evidence that supports the Big Bang:
-Cosmic Microwave Background Radiation
-Hubble's Law (expansion of the universe)
-Abundance of primordial elements
-Galactic evolution and distribution
"The spiritual force transcends all. -- I feel this great creative and spiritual force within me that is greater than faith, greater than ambition, greater than confidence, greater than determination, greater than vision. It is all these combined. My brain becomes magnetized with this dominating force which I hold in my hand". Bruce Lee
Yet, he fails to include "passion" in his list of things that are transcended by spiritual force. His list includes:
faith -religion
ambition -goal setting
confidence -belief in one's own abilities
determination -will to follow through
But, passion is a different thing altogether. And I think he just didn't know how to explain it. Men have a hard time discussing their feelings. He feels passionate about martial arts, but he wants to call it "spiritual force" because he doesn't know how to articulate his feelings. To him, it's a vauge concept that can only be encapsulated by an equally vague term.
It seems to me that considering Bruce Lee was a University philosophy major, and influenced by Taoism and Buddhism, that he knew full well what the words "spiritual force" and "passion" meant, respectively.
I loved your Bruce Lee post, by the way, sponger. It was beautiful, inspiring and well-written. My point is that from different worldviews the very same force can be utilised and appreciated by an athiest as "passion" and by a Christian as "God".
You pointed to a natural outlet of potential it seemed, juxtaposed against a more contrived inspiration meant to create purpose. I agree totally that one is a step removed from the other. And yet, people must make do with what works for them where they are in their lives.
"The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth." ~ Niels Bohr
Comments
Yet, he fails to include "passion" in his list of things that are transcended by spiritual force. His list includes:
faith -religion
ambition -goal setting
confidence -belief in one's own abilities
determination -will to follow through
But, passion is a different thing altogether. And I think he just didn't know how to explain it. Men have a hard time discussing their feelings. He feels passionate about martial arts, but he wants to call it "spiritual force" because he doesn't know how to articulate his feelings. To him, it's a vauge concept that can only be encapsulated by an equally vague term.
http://forums.pearljam.com/showthread.php?t=272825
There's actually quite a bit of evidence that supports the Big Bang:
-Cosmic Microwave Background Radiation
-Hubble's Law (expansion of the universe)
-Abundance of primordial elements
-Galactic evolution and distribution
I loved your Bruce Lee post, by the way, sponger. It was beautiful, inspiring and well-written. My point is that from different worldviews the very same force can be utilised and appreciated by an athiest as "passion" and by a Christian as "God".
You pointed to a natural outlet of potential it seemed, juxtaposed against a more contrived inspiration meant to create purpose. I agree totally that one is a step removed from the other. And yet, people must make do with what works for them where they are in their lives.
http://www.myspace.com/illuminatta
Rhinocerous Surprise '08!!!