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But you did seem to be attempting to tar the whole of cog-sci with some sort of Cartesian brush, so it's useful to know that isn't your intention. Quote:
With reference to Müller-Lyer, there's no doubt at all that something in the brain codes the lines as being of different lengths: lines of the same length are projected on the retina, and the words "These lines are different lengths" come out of the mouth. Between those two events lies nothing but brain activity (if you'll allow me to include retinal processing under the umbrella of the brain). So saying that somewhere in the brain the lengths of the lines are perceptually altered is a truism, unless you believe that there really is a "liar" in Müller-Lyer. Quote:
So from where I stand you seem to be tilting at non-existent windmills. Grant Hutchison |
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The anterior part of the frontal lobes does appear to be involved in "personality", in the sense of controlling the range of emotions individuals characteristically exhibit: a pattern that becomes recognizable to others and which is one feature of "personality". Hence the unfortunate vogue for Walter Freeman's prefrontal lobotomies, applied to people with various behavioural problems in the 40s and 50s. The most famous prefrontal lobotomy patient in the world is probably Phineas Gage, who underwent the procedure under uncontrolled circumstances. While he was working as a railway construction foreman, an explosion sent a tamping iron straight through his head: there's a diagram of the extent and nature of of his injury here. He recovered consciousness almost immediately, and lived for another 12 years, but his personality had changed completely. Although this is often quoted as an example of the prefrontal cortex's role in the generation of personality, I've always felt there was a significant confounding factor involved: the guy had had a metal rod blown through his face and out the top of his head, for crying out loud! That might just change your outlook on life, all on its own. Grant Hutchison |
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I don't know if this applies as a pre-frontal cortex sitution or not, but my father's personality dramatically shifted in his thirties, along with some physical symptoms, like blackouts, that were later attributed to a benign cyst on the exterior right hand side of his head just aft of the cheek. The doctors postulated that it was pressure from this on a part of his brain in that region that drove him to hair trigger temper and near psychotic violence. After it was removed, his personality 180'd. Completely controlled and cool. It was definitely not very deep inside the brain, in fact, based on the descriptions I've heard, I believe it was on the surface. Now, it could have been a chemical issue, but that would indicate the potential to alter personality through pressure somewhere other than the interior of the brain.
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The last time I felt a warm fuzzy feeling, I was informed by my doctor that it was just gas. |
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António Damásio talks about Phineas' case and other intriguing ones in Descartes' Error.
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"A witty saying proves nothing" Voltaire. "All your bias are belong to us" Ara Pacis. |
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The common, traditional (representational) view of vision may go something like this: Although I think I see objects around me, all I really know for sure is that I am having a conscious experience of there being objects. Science tells us that the world is really a colorless cloud of atoms, but I see the world in vivid color. Consciousness, then, must be a creation of my brain. It creates these phenomena, qualia, appearances, or representations as philosophers call them. Because I perceive only representations, any reality or noumemon that may ultimately be behind them must necessarily remain unknown. Experiences we take as visual failure like misreading a word, optical illusions, and so on are explained by the brain creating the wrong representation or creating a representation that fools us. Non-representational approaches don't consider perception as a thing, and certainly not a thing created or assembled by the brain. Remember one of the earlier quotes: Perception is an achievement of the individual and not an experience the theater of consciousness. Take a look at the abstract on the first page: A Sensorimotor Account of Vision and Visual Consciousness (PDF) In the 1960's, psychologist JJ Gibson proposed studying perception from an ecological viewpoint. He suggested studying visual perception in terms of the ambient optic array, that is, the patterned radiation that converges on your position as well as how it changes as you move about (optical texture flow). He thought that most if not all of what we think is created in the head actually exists in the environment as higher-order information that animals can detect and take advantage of. Here is an excerpt from his book. You can glance at the pictures and the captions to get a sense of his interests: The Causes of Deficient Perception Quote:
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I think there is a justified fear of attributing the act of composition to a mere machine (which the body may seem to us at times). Gilbert Ryle showed the premise to be misguided. He wrote in The Concept of Mind: "Man need not be degraded to a machine by being denied to be a ghost in a machine. He might, after all, be a sort of animal, namely, a higher mammal. There has yet to be ventured the hazardous leap to the hypothesis that perhaps he is a man." Quote:
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The phrase "perception is an achievement of the individual" is neatly analogous to the guilty child's explanation of the broken mirror: "It just broke." Grant Hutchison |
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As for pain, there wasn't that, just pressure on the brain itself. He had absolutely no localized awareness anything was going on upstairs. The brain itself is insensate, so I've read.
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The last time I felt a warm fuzzy feeling, I was informed by my doctor that it was just gas. |
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Edited to add: By the way, Ken, Grant's response, which is a fair one from the representational side, is what I had in mind with the "Hey, where are the vortexes?" Newton-era analogy. The representational side will always think that there is a hard problem of consciousness that non-representationalists are skirting. |
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laws of sensorimotor contingency." In other words, seeing is as seeing does. A classic example of what I have called "a projection". It is perfectly obvious to me that this projection may reveal interesting things about vision, just as it is equally obvious that it will leave out important pieces of the puzzle. It's the perfect example of the kind of logic I've been objecting to-- arguing that since a shadow is a good way to understand a person's outline, the color of their shirt must be a delusion of some kind. Quote:
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Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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It surprises me to hear you say that, because as I understand the term, you would be "coming from the representational side" any time you ask someone "does this hurt", instead of waiting for them to moan or kick or interact with the environment in some way. I'm not saying that you need to adopt a philosophical stance on consciousness each time you ask that question, merely you pop on a hat because of its immediate advantages. Indeed, the whole idea of adopting a general philosophical stance is what I'm criticizing, and perhaps that's what you mean when you say you are not "coming from" any particular philosophical stance, be it representational or otherwise. Also, psychotherapy almost always treats the patient's mind as if it were a separate entity from whatever is going on around it-- the techniques of psychotherapy are intended to work in a wide array of environmental situations, without the therapist actually encountering that environment at all, and seems pretty "representational" to me.
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Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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It also seems to me that Joe Durnavich has been using "representational" as being in some way synonymous with the Cartesian theatre and/or substance dualism. So there are aspects of cognitive science that might be characterized as "representational" according to your understanding of the term, but not according to the usage I think I see from Joe Durnavich. Grant Hutchison |
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My personal view is that to treat a color as a thing would be to say that a cup is made up of one unit of cylinder-shape, one unit of hardness, and one unit of redness. That treats properties we attribute to objects as objects in their own right. The cup, of course, is made of fired ceramic slip and paint. To attribute properties to objects, be they colors, shapes, feels, temperature, and so, is more a matter of grouping objects and substances in various ways. We learn our colors by being shown objects. For “red” we may be shown cherries, apples, and firetrucks. Those objects become the references for red. The reason we classify other objects as being red, and why we consider them all the same color may be found in the objects' reflectance properties, the lighting, the spectral responses of the retinal photopigments, and so on. Perception is an ability to tell things apart. What we cannot tell apart, we judge the same. So, in that sort of view, colors are not delusional. We don't see colors; we see objects. We group objects in various ways depending on the nature of the objects, our discriminative abilities, and the tasks at hand. In this view, we don't find qualia in our heads colorful; we find the world colorful. Color is real; it just doesn't exist as a singular entity either in the head our out in the world. It is a more sophisticated matter than it may seem to us at first. No doubt you still think my view totally misses the key issue of what makes red so, well, red. The challenge in that case, I think, is to show that notion makes any sort of sense that can be addressed at all. |
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To moan is part of being in pain. To answer the question "Does this hurt?" with, "Yes!" is part of being in pain. |
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Grant Hutchison |
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Grant Hutchison |
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Well, that's the dualism. It functions well for us in everyday conversation, but when we have our philosophy hats on, we may think that when we eliminate the report, what must be left over is the pain. (It is like trying to find your "self" by "working inward," eliminating body parts from consideration until what must be left over is the "self" or the "I".)
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This particular example consists of things outside the head, namely various combinations of wavelengths and the fact that people see them as the same. On the face of it, it suggest that an account of color will depend on both the nature of person and the nature of objects and light in the environment.
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Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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Grant Hutchison |
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The separation you seek does exist, as we discussed earlier. It is in our actions. You and I could each see a house differently. But we each don't possess a "perceived house" that is distinct from the actual house. We simply noted different features of the house for any of a number of reasons. So, yes, we say our perceptions are different, but there is no representation anywhere like a photo or a painting in the head. You don't need to posit such an entity to draw the distinction you need between reality and what people think they see in reality. |
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Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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__________________
Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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Notice that is an indirect argument. Representations tend to be demonstrated indirectly and rarely, if ever, directly. Anything not present in the tank is the rest of the world, but I think you would have just said that if that is what you meant.
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Logic is the grammar of truth. Meaning and absolute certainty are incompatible, and profound meaning and absolute certainty are profoundly incompatible. The only thing intelligence is capable of is recognizing itself. |
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