Some early-morning thoughts on the nature of objective and subjective reality ... Some of this material owes a debt to Robert Lanza’s book Biocentrism.
First, definitions. By “objective,” I mean existing independent of consciousness. By “subjective,” I mean existing only with regard to consciousness. And by “consciousness,” I mean any perceiving mentality, not necessarily a human mind.
It has long been understood that certain properties of the physical world are objective in one sense but subjective in another. Color is the example most often cited. Color is objective in the sense that it exists as a particular wavelength of the electromagnetic spectrum, and as such, it can be expressed as, or reduced to, pure information; a wavelength can be expressed in purely mathematical terms. On the other hand, what we normally think of as color is subjective in the sense that it is known only to a perceiving consciousness. The color red exists objectively as a point on a spectrum; it exists subjectively as our experience of redness.
Sound is objective in the sense that it exists as a particular wavelength, and subjective in the sense that it requires a perceiver – an auditor – to to be something more than a wavelength. The old puzzler that begins “If a tree falls in the forest ...” can easily be answered if we understand that the sound made by the tree is only a wavelength unless and until it is rendered by consciousness into a subjectively perceived sound.
I would argue that the same logic holds true for any perceptual quality. Take smoothness. Objectively, smoothness is reducible to the chemical constituents of a particular object. Subjectively, smoothness exists only for a perceiving consciousness.
In short, I’d suggest that what we call physical things are simply sensory models – assemblages of perceptual properties such as color, shape, texture, sound, and scent.
This point is controversial. It is often argued that while some properties, such as color, are necessarily subjective, other properties are objective. An apple, for instance, is said to exist objectively in terms of shape, weight, density, etc., but subjectively in terms of properties like color. The argument is that if the perceiver were removed from the scene, the apple would still exist as a round, thick, heavy physical object, but it would not have the property of redness because there would be no visual mechanism to perceive redness.
But I would suggest that, without a perceiving consciousness of some kind, the apple would exist only as its informational properties, which include every aspect of its physical being. It would exist in the same sense that a virtual apple in a computer game exists when the monitor is shut off. All the informational content (Including shape, weight, and density) is there, but it is not being rendered into a sensory model. The computer may continue running the program, and the ongoing career of the virtual apple may be plotted in informational space, but there is no model of the apple on the screen.
So, to my way of thinking, there is no hard and fast distinction between one set of properties and another. The redness of the apple and the weight of the apple are equally subjective in one sense, and equally objective in another. Both properties are objective in that they can be expressed as, or reduced to, mathematics. They are subjective in the sense that they exist for us as aspects of perceptual models.
Stephen Hawking notably asked, “What is it that breathes fire into the equations and makes a universe for them to describe?” The idea is that the space-time cosmos can be reduced to mathematics, but what makes the mathematics “come alive” as a physical, experiential reality? I would suggest that consciousness is what breathes fire into the equations. Consciousness makes the mathematics come alive. Each perceiving consciousness renders its own private model of the world and inhabits this mental space. A bumblebee perceives the colors of the flowers it pollinates; these colors are part of its mental space, and would not exist, except as wavelengths, in the absence of the bee’s awareness. Moreover, the flowers themselves, no less than their particular colors, are sensory models that would not exist without a perceiving consciousness, any more than the virtual-reality models of flowers in a computer game would continue to exist (as models) if the render engine stopped functioning.
It is possible to frame this argument in terms of certain interpretations of quantum physics, by claiming that if the “collapse of the wave function” requires an observer, then nothing can assume definitive physical form until it has been perceived. An objection to this line of reasoning is that, according to the theory of quantum decoherence, it is possible for the wave function to collapse even when no observer is present. A counter-argument is that decoherence merely expands quantum superposition, but does not actually resolve it until an observer enters the picture. In any event, the bottom line is that decoherence, like any other theory, can be confirmed only by observation; in the absence of observation, it remains only a theory, and as such is reducible to equations and formulas; it’s observation that breathes fire into the equations.
Note that according to this viewpoint, reality is both objective and subjective. The underlying informational content, which corresponds roughly to Immanuel Kant’s noumenal realm, is objective because it exists independent of an observer. The assemblages of properties as sensory models that constitute what we call physical reality, corresponding to Kant’s phenomenal realm, are subjective, because these models exist only in the context of an observing consciousness. In fact, consciousness plays a more active role than the word “observation” would suggest; consciousness serves to render the information into perceptual models. All physical reality is experiential reality, and there can be no experience without an experiencer. A universe devoid of consciousness would not be a universe, in the sense of a space-time cosmos, at all. It would be a sea of information, endlessly processed, but never rendered into sensory models. It might also be said to exist in a state of perpetually unresolved superposition, if an observer is necessary to collapse the wave function.
It seems to me that this general approach avoids the problems of both physicalism and idealism. Physicalism interprets reality purely in physical terms, and leaves no room for consciousness except as an epiphenomenon. Idealism interprets reality purely in terms of consciousness, and tends toward solipsism. Physicalism downplays or ignores the central fact of our existence — namely, our own consciousness. Idealism suggests that everything is subjective, and that there can be no such thing as objective reality or objective truth.
The approach outlined here, however, leaves room for both subjective consciousness and objective reality. Our personal mental space is modeled by our own consciousness and is thus subjective, but it is grounded in an informational matrix that is independent of us and common to all observers. Whether reality is ultimately dualistic (information and consciousness) or monistic (information existing within consciousness, or consciousness emerging out of information) is a deeper question. I think I would need to have my morning coffee before I tackle that one ...
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