My central claim is that the ontology of all the phenomenological worlds we enjoy--whether those of dreams, computer-generated models or waking "reality"-is basically the same: the realities experienced are always "virtual". The neural mechanisms capable of bringing about any sort of sentience at all are buried inside our skulls and, thus, cannot reach out from there--the non-virtual world outside the skull is, in itself, black and imperceptible. Neither the neural mechanism of consciousness nor the phenomenological consciousness itself is able to travel backwards on the causal chains--through the afferent neural pathways--to the real world out there, and "sense" it, touch it, hear it or see the objects out there. We all know that this is so: if consciousness exists at all; if there is a phenomenological level of organization realized in the neurobiology of the brain, there is no way it could travel outward from the brain. If consciousness cannot exist in the world outside the brain, it inevitably follows that the world we experience must exist inside the brain. If there is a consciously experienced model of the world constructed in the brain, causal chains from the world outside must travel inward, in order to constrain this model; virtual actions performed on the model must immediately travel outward, in order to have effects on the world outside. Let us approach this VR metaphor of consciousness through a thought experiment.
The Black Planet. Imagine that you are going to land into an unexplored planet. When you get out of your space capsule, you are engulfed by an impenetrable darkness and silence. You cannot see anything, hear anything, feel anything. There certainly is an environment somewhere out there, but you are utterly unable to sense it in any way and, consequently, there is no "organism-environment interaction" to speak of. You feel like floating in a sensory-deprivation tank, not even able to perceive the position of your body, let alone the environment you are surrounded by. Somehow you manage to return to the mother ship. You examine carefully all the data that was collected from the planet's surface. You find out that actually there is a lot of physical activity going on but of a kind you have never encountered before. Consequently, you were not able to perceive anything. Well, you do not give up--you design a suit that has sensors for the alien radiations and vibrations on the planet, translating them to the sort of physical stimuli that your body is able to handle. Thus, a certain sort of alien radiation is translated, by your goggles, into electromagnetic radiation of the visible wavelengths; the vibrations of the planet's strange atmosphere are translated into vibrations of air near your ears, and so on. When you return to the planet, you step into a quite different, spatial and extended world of objects, colors and sounds. Now your brain is able to construct an experienced model of the world which enables you to successfully interact with the world. Of course, the world, in itself, is still silent and dark, but nevertheless, your brain is now clothing it (its model, that is) with properties that do not really exist out there. The phenomenological level of organization is, thus, an illusion created by the brain, but still, a most useful one.
It may not come as a surprise if I now tell you that actually the strange planet is the earth, the spacesuit is our physical body, especially its sensory organs; the "translation" of alien physical signals to familiar ones is the transmutation from physical stimuli to neural firings; and the useful illusion somehow created inside the brain is the thing that we ordinarily call "reality": the experienced model of the world with the self as the central actor. "Reality" is only the "VR" constrained by current sensory input. For the neurobiological systems realizing the phenomenological level of organization, electromagnetic radiation of any kind or wavelength is just darkness; the vibrations of any gas or liquid are just silence, and the physical contact of skin with objects is nothing but anesthesia. For the brain, for the neural mechanisms underlying consciousness (such as the thalamocortical complex), the sensory and motor systems are nothing but a "brain-mounted 3D display" connected with a whole-body "data suit" and a telepresence system which allows virtual movement to be translated into real effects in the world through voluntary muscles.
If the technological variety of VR has made it possible for us to experience "out-of-the-body experiences" with telepresence robotics, mother nature certainly clothed us, that is, the phenomenological level of organization, with a built-in "out-of-the-brain" experience. But, remember, we are not really out of our brains in our experiences--how could we if all the required neural machinery sits tightly there--no more than Rheingold was really out of his body in the Japanese laboratory. No, we are only virtually out of the brain and in the external world. In fact, we did not invent VR at all--evolution invented it for us millions of years ago. We have merely invented one fresh way to use, with the help of computer technology, the natural VR machine in our brain. Through all these millennia, the natural, ultimate VR was humming inside our brains, producing dreams and waking experiences. And, lacking the concepts of "virtual world" and "virtual presence", we were fooled to think that we are somehow reaching out from our brains in our experiences. Finally, we know better.
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Title:Consciousness, dreams and virtual realities.Authors:Revonsuo, AnttiSource:Philosophical Psychology; Mar95, Vol. 8 Issue 1, p35, 24p


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