Science Fiction and Philosophy

From Time Travel to Superintelligence

Susan Schneider, Susan Schneider

• Éditeur: Wiley-Blackwell
• Année: 2010
• ISBN:
  9781444327908
• Édition: 1
• Sujet: Philosophy
• Sous-sujet: Philosophy History & Theory

A timely volume that uses science fiction as a springboard to meaningful philosophical discussions, especially at points of contact between science fiction and new scientific developments.

• Raises questions and examines timely themes concerning the nature of the mind, time travel, artificial intelligence, neural enhancement, free will, the nature of persons, transhumanism, virtual reality, and neuroethics
• Draws on a broad range of books, films and television series, including The Matrix, Star Trek, Blade Runner, Frankenstein, Brave New World, The Time Machine, and Back to the Future
• Considers the classic philosophical puzzles that appeal to the general reader, while also exploring new topics of interest to the more seasoned academic

Part I
COULD I BE IN A “MATRIX” OR COMPUTER SIMULATION?

Related Works

The Matrix
Permutation City
The 13th Floor
Vanilla Sky
Total Recall
Animatrix

1
BRAIN IN A VAT

John Pollock

It all began that cold Wednesday night. I was sitting alone in my office watching the rain come down on the deserted streets outside, when the phone rang. It was Harry’s wife, and she sounded terrified. They had been having a late supper alone in their apartment when suddenly the front door came crashing in and six hooded men burst into the room. The men were armed and they made Harry and Anne lie face down on the floor while they went through Harry’s pockets. When they found his driver’s license one of them carefully scrutinized Harry’s face, comparing it with the official photograph and then muttered, “It’s him all right.” The leader of the intruders produced a hypodermic needle and injected Harry with something that made him lose consciousness almost immediately. For some reason they only tied and gagged Anne. Two of the men left the room and returned with a stretcher and white coats. They put Harry on the stretcher, donned the white coats, and trundled him out of the apartment, leaving Anne lying on the floor. She managed to squirm to the window in time to see them put Harry in an ambulance and drive away.

By the time she called me, Anne was coming apart at the seams. It had taken her several hours to get out of her bonds, and then she called the police. To her consternation, instead of uniformed officers, two plain clothed officials arrived and, without even looking over the scene, they proceeded to tell her that there was nothing they could do and if she knew what was good for her she would keep her mouth shut. If she raised a fuss they would put out the word that she was a psycho and she would never see her husband again.

Not knowing what else to do, Anne called me. She had had the presence of mind to note down the number of the ambulance, and I had no great difficulty tracing it to a private clinic at the outskirts of town. When I arrived at the clinic I was surprised to find it locked up like a fortress. There were guards at the gate and it was surrounded by a massive wall. My commando training stood me in good stead as I negotiated the 20 foot wall, avoided the barbed wire, and silenced the guard dogs on the other side. The ground floor windows were all barred, but I managed to wriggle up a drainpipe and get in through a second-story window that someone had left ajar. I found myself in a laboratory. Hearing muffled sounds next door I peeked through the keyhole and saw what appeared to be a complete operating room and a surgical team laboring over Harry. He was covered with a sheet from the neck down and they seemed to be connecting tubes and wires to him. I stifled a gasp when I realized that they had removed the top of Harry’s skull. To my considerable consternation, one of the surgeons reached into the open top of Harry’s head and eased his brain out, placing it in a stainless steel bowl. The tubes and wires I had noted earlier were connected to the now disembodied brain. The surgeons carried the bloody mass carefully to some kind of tank and lowered it in. My first thought was that I had stumbled on a covey of futuristic Satanists who got their kicks from vivisection. My second thought was that Harry was an insurance agent. Maybe this was their way of getting even for the increases in their malpractice insurance rates. If they did this every Wednesday night, their rates were no higher than they should be!

My speculations were interrupted when the lights suddenly came on in my darkened hidey hole and I found myself looking up at the scariest group of medical men I had ever seen. They manhandled me into the next room and strapped me down on an operating table. I thought, “Oh, oh, I’m for it now!” The doctors huddled at the other end of the room, but I couldn’t turn my head far enough to see what they were doing. They were mumbling among themselves, probably deciding my fate. A door opened and I heard a woman’s voice. The deferential manner assumed by the medical malpractitioners made it obvious who was boss. I strained to see this mysterious woman but she hovered just out of my view. Then, to my astonishment, she walked up and stood over me and I realized it was my secretary, Margot. I began to wish I had given her that Christmas bonus after all.

It was Margot, but it was a different Margot than I had ever seen. She was wallowing in the heady wine of authority as she bent over me. “Well Mike, you thought you were so smart, tracking Harry here to the clinic,” she said. Even now she had the sexiest voice I have ever heard, but I wasn’t really thinking about that. She went on, “It was all a trick just to get you here. You saw what happened to Harry, He’s not really dead, you know. These gentlemen are the premier neuroscientists in the world today. They have developed a surgical procedure whereby they remove the brain from the body but keep it alive in a vat of nutrient. The Food and Drug Administration wouldn’t approve the procedure, but we’ll show them. You see all the wires going to Harry’s brain? They connect him up with a powerful computer. The computer monitors the output of his motor cortex and provides input to the sensory cortex in such a way that everything appears perfectly normal to Harry. It produces a fictitious mental life that merges perfectly into his past life so that he is unaware that anything has happened to him. He thinks he is shaving right now and getting ready to go to the office and stick it to another neurosurgeon. But actually, he’s just a brain in a vat.

“Once we have our procedure perfected we’re going after the head of the Food and Drug Administration, but we needed some experimental subjects first. Harry was easy. In order to really test our computer program we need someone who leads a more interesting and varied life - someone like you!” I was starting to squirm. The surgeons had drawn around me and were looking on with malevolent gleams in their eyes. The biggest brute, a man with a pockmarked face and one beady eye staring out from under his stringy black hair, was fondling a razor sharp scalpel in his still-bloody hands and looking like he could barely restrain his excitement. But Margot gazed down at me and murmured in that incredible voice, “I’ll bet you think we’re going to operate on you and remove your brain just like we removed Harry’s, don’t you? But you have nothing to worry about. We’re not going to remove your brain. We already did - three months ago!”

With that they let me go. I found my way back to my office in a daze. For some reason, I haven’t told anybody about this. I can’t make up my mind. I am racked by the suspicion that I am really a brain in a vat and all this I see around me is just a figment of the computer. After all, how could I tell? If the computer program really works, no matter what I do, everything will seem normal. Maybe nothing I see is real. It’s driving me crazy. I’ve even considered checking into that clinic voluntarily and asking them to remove my brain just so that I can be sure.

2
ARE YOU IN A COMPUTER SIMULATION?

Nick Bostrom

The Matrix got many otherwise not-so-philosophical minds ruminating on the nature of reality. But the scenario depicted in the movie is ridiculous: human brains being kept in tanks by intelligent machines just to produce power.

There is, however, a related scenario that is more plausible and a serious line of reasoning that leads from the possibility of this scenario to a striking conclusion about the world we live in. I call this the simulation argument. Perhaps its most startling lesson is that there is a significant probability that you are living in a computer simulation. I mean this literally: if the simulation hypothesis is true, you exist in a virtual reality simulated in a computer built by some advanced civilisation. Your brain, too, is merely a part of that simulation. What grounds could we have for taking this hypothesis seriously? Before getting to the gist of the simulation argument, let us consider some of its preliminaries. One of these is the assumption of “substrate independence.” This is the idea that conscious minds could in principle be implemented not only on carbon-based biological neurons (such as those inside your head) but also on some other computational substrate such as silicon-based processors.

Of course, the computers we have today are not powerful enough to run the computational processes that take place in your brain. Even if they were, we wouldn’t know how to program them to do it. But ultimately, what allows you to have conscious experiences is not the fact that your brain is made of squishy, biological matter but rather that it implements a certain computational architecture. This assumption is quite widely (although not universally) accepted among cognitive scientists and philosophers of mind. For the purposes of this chapter, we shall take it for granted.

Given substrate independence, it is in principle possible to implement a human mind on a sufficiently fast computer. Doing so would require very powerful hardware that we do not yet have. It would also require advanced programming abilities, or sophisticated ways of making a very detailed scan of a human brain that could then be uploaded to the computer. Although we will not be able to do this in the near future, the difficulty appears to be merely technical. There is no known physical law or material constraint that would prevent a sufficiently technologically advanced civilisation from implementing human minds in computers.

Our second preliminary is that we can estimate, at least roughly, how much computing power it would take to implement a human mind along with a virtual reality that would seem completely realistic for it to interact with. Furthermore, we can establish lower bounds on how powerful the computers of an advanced civilisation could be. Technological futurists have already produced designs for physically possible computers that could be built using advanced molecular manufacturing technology. The upshot of such an analysis is that a technologically mature civilisation that has developed at least those technologies that we already know are physically possible would be able to build computers powerful enough to run an astronomical number of human-like minds, even if only a tiny fraction of their resources was used for that purpose.

If you are such a simulated mind, there might be no direct observational way for you to tell; the virtual reality that you would be living in would look and feel perfectly real. But all that this shows, so far, is that you could never be completely sure that you are not living in a simulation. This result is only moderately interesting. You could still regard the simulation hypothesis as too improbable to be taken seriously.

Now we get to the core of the simulation argument. This does not purport to demonstrate that you are in a simulation. Instead, it shows that we should accept as true at least one of the following three propositions:

1. The chances that a species at our current level of development can avoid going extinct before becoming technologically mature is negligibly small.
2. Almost no technologically mature civilisations are interested in running computer simulations of minds like ours.
3. You are almost certainly in a simulation.

Each of these three propositions may be prima facie implausible; yet, if the simulation argument is correct, at least one is true (it does not tell us which).

While the full simulation argument employs some probability theory and formalism, the gist of it can be understood in intuitive terms. Suppose that proposition (1) is false. Then a significant fraction of all species at our level...