A further text from Hoffman:
"Peeking Behind the Icons" from
Donald Hoffman,
Visual Intelligence: How We Create What We See
Extracts:
" . . . Of course it’s not technology per se that creates realistic virtual worlds. It’s the customers, the ones paying their hard-earned cash, who are the real creators. Virtual reality is only possible because we, the customers, construct what we perceive.
We are the source of the stock cars we pass in a virtual drag race, the prospective stadium we scrutinize in a virtual architectural walk through, the molecules whose 3D shape we see and whose electric forces we feel in a virtual chemistry course, and the delicate, bleeding tissues we slice in a virtual open-heart surgery. The high tech displays cleverly prompt us to construct these scenes, and the more clever the prompting the better scenes we can construct (and the more we’re willing to pay). But the displays can only prompt, they can’t construct the virtual realities for us. What makes one display more compelling than another is that it more fully engages the constructive processes of the customer. But now let’s use virtual reality for another purpose, as a metaphor to explore questions that have probably nagged you about the story on perceptual construction. Questions like these: if we each construct all we see, then why do we all see the same things? What is the relationship between “reality” and our constructions? . . . ."
"But what is your relational brain? Does it resemble your phenomenal brain? There’s no reason to suppose it does. In fact, as we saw with the volleyball, there’s no reason to suppose that the nature of the phenomenal brain in any way constrains the nature of the relational brain. Your phenomenal brain is simply a graphical interface that allows you to interact with your relational brain, whatever that relational brain might be. And all that’s required of a graphical interface is that it be systematically related to what it represents. The relation can be as arbitrary as you wish, as long as it’s systematic. The trash can icon on your computer screen is a graphical interface to software which can erase files on your computer disk. The trash can icon is systematically related to that erasing software, but the relation is arbitrary: the trash can icon doesn’t resemble the erasing software in any way. It could be any color or shape you wish and still successfully do the job of letting you interact with the erasing software. It could be a pig icon or a toilette icon instead of a trash can icon. All that matters is the systematic connection."
". . . If “well adapted” doesn’t mean “resembles,” then what does it mean? It means a systematic but arbitrary relation. Our perceptual experiences are well adapted to the relational realm because they provide a systematic but arbitrary guide to those aspects of the relational realm that are critical to our needs and our survival — just as the icon interface on your computer is well adapted because it provides a systematic but arbitrary guide to the computer’s unseen circuits and software. Something might still seem wrong here. Look, you say, when I see a snake slithering toward me in the grass, then I would be a fool not to think that there really is a snake, and I would be a fool not to get out of the way. Natural selection has seen to it that when I see snakes, there are snakes, and there is real danger. Granted, when you see snakes there are snakes, and you must take them seriously. Similarly, when you see a trashcan icon on your computer screen, there really is a trashcan icon, and when you see a document icon representing that text file you’ve been editing for the last five hours, there really is a document icon. And you must take these icons seriously. If you drag that document icon into that trash-can icon then you’ll lose your last five hours of work.
That’s a serious consequence. To say that experiences provide a systematic but arbitrary guide to the relational realm is not to deny that experiences are real and must be taken seriously. Snake experiences are real experiences and must be taken seriously. But they don’t entail that anything in the relational realm resembles a snake, just as a trash can icon doesn’t entail that circuits and software resemble a trash can.
Neither biology nor quantum theory dictates the nature of the relational realm. Nor does any other science. Each studies certain phenomena, and describes these by precise theories. In no case do the phenomena or the theories dictate the nature of the relational realm. We might hope that the theories of science will converge to a true theory of the relational realm. This is the hope of scientific realism. But it’s a hope as yet unrealized, and a hope that cannot be proven true.
So this is a small sample of what happens when we peek behind the icons, when we ask what else there might be in addition to our perceptual constructions. We find a myriad of fascinating questions. We find that we’ve entered the province of philosophy and religion. Because the phenomenal and relational realms need not resemble each other, because their relationship is arbitrary and systematic, the tools of science can help us guess at the nature of the relational realm, but might never dictate a final verdict."
http://anti-matters.org/articles/35/public/35-30-1-PB.pdf