Magical Realist
Valued Senior Member
Thanks. I own The Rediscovery of the Mind and another of Searle´s but have not read them for years. I have long thought Searle´s Position on the mind/ brain problem the most reasonable (next to mine, of course) and agree 100% with all he says in you quote. I go a little farther than Searle does, in that I identify consciousness as being a higher level creation of the brain, mostly achieved in parietal lobes. -A part of the larger process that makes the world we directly perceive.
Searle, like almost all cognitive scientists ignores several embarrassing known facts that are not only explained by my RTS version of perception, but required for it to be correct. For example:
(1) Everyone, me included, agrees that the first processing of all the sensory input information by the brain is deconstruction. To use visual data as an example: Information arriving at V1 is parsed into sets of neural loops with different mutually re-enforcing oscillation frequencies in the general range of 30 to 50 Hz. These, probably correspond to objects so separated from the continuous field of visual stimulation. I have published a detailed paper in 1994 on how this is achieved at the neuronal level by known properties of neurons (not some higher hand-waving phrases). The most important neural facts being that each neuron part of a "contrast line detector receptive field" mutually excites near by line detector neurons of the same or nearly the same line orientation and has an inhibitory effect on the nearby line detectors whose "receptive fields" are orthogonal. (It is very much like the same process that occurs when several AC generators with slightly different natural frequencies are interconnected - they all lock together with a common frequency.)
After this main V1 (and some of V2) segregation or parsing into objects, each object is "tagged" by it locally unique frequency, it is then further deconstructed into "characteristic." This takes place in well separated parts of the visual cortex. For example, in V4 there are three sets of color (intensity of white vs. black being one set). The other two are the red / green axis and the blue / yellow axis neurons. Motion (speed and direction) of each of frequency distinct objects is "measured" in V5; But no where does the deconstructed into physically separated object "characteristics” ever come together again in any one set of neural tissue. Yet, if the visual scene was a red cube and a bouncing yellow tennis ball that is what we perceive. Not any other alternative such as a bouncing yellow cube a stationary red ball. Very few cognitive scientists even acknowledge this "where & how does it all come together" problem.
The same deconstruction happens to all the sensory inputs. For example, the very first thing that happens to the sound waves an orchestra makes in the cochlea is to be separated into their different frequency components (Sort of like Fourier analysis) before being separately sent into the acoustical part of the temporal lobes. The "Middle C" energy from the piano and all the other instruments is exciting the same cilia (fine hair cells) inside the liquid filled cochlea as if one, yet we hear the instruments each distinctly!
Summary of (1): We perceive correctly the unified world, not the neurally deconstructed (separated into different parts of the brain and never rejoined) characterizes of it. In my RTS version of perception this deconstruction into separated characteristic is done for the same reason a pilot uses an item-by-item check list. For example if on your TV a red ball rolling down a hill becomes and suddenly becomes blue - only that one color characteristic in the Real Time Simulation needs to be revised. - Keeping the RTS an accurate model of the external world is most accurate and efficient if the sensory data has early on in the neural processing been deconstructed into a set of characteristic. (More than a dozen are known: For example surface texture as well as color is one.)
(2) Without some temporal projection ahead of steady motions to compensate for the neural delays, playing a fast game of ping-pong would be impossible. I.e. you would perceive the ball where it was at least 0.2 seconds earlier - i.e. still on the other side of the net when you should be hitting it back. That temporal forward projection is the essence of what the Real Time Simulation of a world to perceive is all about. It provided a huge survival advantage to our ancestors who first perfected the RTS when in combat (thrown rocks and spears) with the larger, stronger, bigger brained, Neanderthals (and at least a dozen other hominoid types) so they could "explode" Out of Africa about 50,000 years ago and dominate the world of other creatures that still perceived the world with a small fraction of a second delay due to sequential stages of neural processing.
(3) Numerous neural/physiological facts have no reason to exist if as cognitive scientist believe, our perception "emerge" after many stages one neural processing - neural transformations or calculations operating on the sensory input data. For example, The existence of these large white fiber retro-tracks is such an unexplained embarrassment to the accepted theory of perception that it is rarely even acknowledged to be the case (except by neurophysiologist, but not by cognitive scientists). For example, slightly more than half of the input to the visual cortex V1 comes not from the eyes, but via "retrograde fibers" (axons) from the parietal brain!
The RTS not only explains why these retrograde fibers exist, but REQUIRES that they do so that checking, characteristic by characteristic, what is being simulated in the RTS in parietal brain can be corrected to agree with the changing sensory input data ASAP. Likewise there is a huge set of white fibers feeding data back from parietal brain to earlier part of the sensory input system process, especially going back to thalamus, which was often considered to be a "relay station" for the sensory inputs. Visual data from the retina for example goes thru the LGN part of the thalamus. Probably the thalamus functioned prior to the evolution of cortex as a "central processor" for more privative creatures and it is now recognized to be more than just the "relay station" it was thought to be 30 years ago.
There are more than a dozen other well established facts difficult or impossible for the accepted POV about perception to explain that are logical results explained by the RTS. Just to mention one: How can you have a visual experience in dreams with your eyes closed if visual experiences “emerge” following many stages of neural data transformations of retinal data? (Illusions, hallucinations, phantom limbs, etc. – a large list)
Again, If you want to know more about the RTS, please read (and then comment on) the "GFW essay" (Last part of a paper I published in 1994) on here: http://www.sciforums.com/showthread.php?2868-About-determinism&p=882356&viewfull=1#post882356
I see what you are saying. That the RTS has to continuously update itself with any changes that are occurring in the perceived world. And that these haveto be tracked as broken apart qualia of the original gestalt. But I was lying in bed last night thinking, what if we severed all the sensory inputs into the brain--all the nerves from the eyes and the ears and the flesh that carry the electrical signals caused by environmental stimulation--and instead hooked the brain up to a signal generator that exactly duplicatedthose signals? Wouldn't the brain continue to perceive a real world, or at least a RTS of it, and even have the experience of being a body perceiving the real world. Note the signals and the frequencies would have to be injected into the brain from a highly computerized signal generator that could select whatever environment you were experiencing. Note also any motor signals outputed by the brain would be exactly matched by incoming sensory inputs (kinaesthetic and proprioceptive sensations of muscle exertion, motion, and resistance.) Where iow does consciousness of the real world begin? At the brain or at the nerves near the surface of our skin?