Let us imagine a man named Ed who gets a job as a
warehouse worker at a warehouse called Warehouse B. Ed reports to
work on the first day.
Ed: Reporting for work, sir.
Supervisor: Welcome to Warehouse B. Let me brief
you on the job we need you to do.
Ed: I'm all ears.
Supervisor: We want to start storing at this
warehouse all the information we get from our television set.
Ed: I see you have lots of empty shelves here.
That's good; they'll be lots of storage room. So you do have a video
recorder to start recording the shows?
Supervisor: Absolutely not. Such devices are
forbidden here.
Ed: So how could you store all the information
coming from the TV?
Supervisor: That is something you must figure
out, given the rules I set.
Ed: Okay, give me the rules.
Supervisor: Nothing can be written down. We have
no pens or pencils here, and you can never bring any. Writing with a
pen or pencil or electronic device is forbidden here. If you want to
store information, you can only use chemicals or proteins or
electricity.
Ed: Chemicals or proteins or electricity?
Supervisor: Yes, we have all kinds of chemicals
you can use to store the information from the TV. Plus we have lots
of batteries, which you can set to any voltage you want. Plus we
have lots of proteins lying around: ham, cheese, you name it. You can
any use of these things to store the information from the TV set. But
no writing is allowed.
Ed: How on earth could I use chemicals,
electricity and proteins to store all that complicated information
from the TV set?
Supervisor: I don't know. It's your job to figure
that out.
Ed: Can I use some type of electronics to store
the information from the TV shows?
Supervisor: No, electronics are strictly
forbidden here.
Ed: I see you have lots of boxes.
Supervisor: Yes. If you figure out how to store
information from the TV shows using chemicals, electricity, and
proteins, you can put your successful solution in a box, and store it
on the shelf.
Ed: How many of these TV shows do you need to
store?
Supervisor: We need to store all the
programs we get for the next 50 years. And after we've stored that,
we need to be able to retrieve the information instantaneously.
So if someone wants to know what was in some particular show on some
particular date, we have to get that information from the shelves
real fast.
Ed: So these boxes on the shelf will have to be
carefully sorted and labeled, according to some system allowing rapid
retrieval.
Supervisor: But you can't label the outside of
any box – no writing allowed here. And once you've put a box on a
shelf, you can never sort the boxes. And you can't label any of the
shelves or aisles.
Ed: Wait a minute. I'm trying to imagine two
years into the future, when thousands of these unmarked boxes are on
the shelf. How on earth would anyone be able to instantly find a
particular box when somebody asked for the info from one particular
show – say, the information from the next Super Bowl or from the
last episode of America's Got Talent?
Supervisor: I don't know. That's your job to
figure that out. We have lots of wire – you can use as much of that
as you want. But you can't bend the wire into letters. No writing
allowed. And there's one other big problem.
Ed: What's that.
Supervisor: We have ten employees here who like
to steal stuff. So once you start putting things on the shelves,
whatever you put will get stolen real frequently.
Ed: Can you fire those employees?
Supervisor: No, they're guaranteed lifetime
employees, because they're the warehouse owner's kids. They'll stay
working here, no matter how much they steal. And another problem is
that we get lots and lots of rats who come out every night, and who
eat lots of any proteins or chemicals put on the shelves.
Ed: Can we just use some poison to kill off
those rats?
Supervisor: No, that's strictly forbidden.
Ed: So let me see if I have this right. I have to
set things up so that all the information that comes from the TV for
the next 50 years gets stored on our shelves. But I can't use any
electronics or writing to store all that information. All I can use
is electricity, wire, chemicals and protein. I can use boxes, but
none of the boxes can be labeled, marked or sorted. I've got to set
things up so that the information from any requested TV show can be
instantly retrieved, even though we'll just have shelves filled with
unlabeled boxes. The information has to stay put for 50 years, even
though there's ten employees who will be stealing lots of it every
night, and lots of rats who will be eating up lots of chemicals or
proteins I use to store the information.
Supervisor: That's about it. Can you think of
some way to handle this?
Ed: Hell, no! I quit!
As you may have guessed already, Warehouse B is an analogy.
Warehouse B represents the difficulty of storing information in a
human brain. The stream of information from the television set
represents the stream of information that flows through a particular
person's senses as he lives. Storing the information from 50 years
of TV shows would be about as difficult as storing the information
from 50 years of living.
In our analogy, Ed is told that he must store the
complicated information from the TV using only chemicals,
electricity, and proteins, not by using any kind of electronics or
writing. This corresponds to some limitations that would be in a
brain if a brain were to store memories. We have no electronics in
our brains. And neuroscientists examining brain tissue with electron
microscopes have never detected any actual writing in the brain. In
other words, even if we were to examine neurons at a magnification of
500,000 times, we would never see any tiny little letters that corresponded
to some words in your memory.
Neuroscientists claim that the brain stores the very
complex information we remember by using only chemicals, electricity
and proteins. No neuroscientist has ever given a credible detailed
explanation as to how such a miracle of encoding and translation
could be accomplished. How, for example, could there ever be some
combination of chemicals, electricity or proteins that represented
your concept of your country or your religion or your mother?
In our analogy, Ed is told he must stick to a system of
storage that is woefully unsuited for the instantaneous retrieval of
specific information. He is told that he must put things in unmarked
boxes that must be put on unlabeled shelves. Once lots of
information accumulates, this system will not be able to handle
instantaneous retrieval of specific information. For example, if
someone asks three years from now, “What happened in the last Super
Bowl?” or “Who were the winners at the Oscar awards two years
ago?” no one at Warehouse B will be able to produce a quick answer.
With thousands of unmarked boxes on the shelves, there will be no way
to get such information instantaneously.
A brain would suffer from exactly this problem if it
stored memories. For the brain has no coordinate system or position
notation system by which an exact brain location could be located (such as neuron number 343,363,233), nor any
labeling capability by which particular neurons or groups of neurons
can be labeled. So an instantaneous recall of a specific memory (such as what a particular famous person looks like) should be
impossible if it is stored in the brain. Also, neurons cannot be
sorted, given the way they are arranged in a brain, with hundreds or
thousands of connections between each neuron and nearby neurons.
Given such an arrangement, you can no more sort things than you could
sort the trees in a forest.
Suppose someone asks me, “Who was John F. Kennedy.”
I instantly am able to recall an image of his face, and various facts
about him, such as that he died by assassination on November 22,
1963. But how could I find that information so quickly if it was
stored in some very tiny little part of my brain, perhaps from a
location near neuron number 825,223,252? There would be no way for my
brain to know where that exact location was.
It won't do any good for you to suggest that perhaps my
brain scans all of its neurons to find that information. When you are
asked some specific question, you do not at all have any type of
thought experience similar to what it might be like to scan through all of your
memories. You just instantly remember something. And if your brain
was scanning through all its neurons to retrieve some information,
that would take hours or days. You wouldn't be able to remember
something instantly.
There is one other state of affairs in Warehouse B which
is analogous to the situation in the brain. It is the fact that in
Warehouse B there is a rapid loss of information stored on the
shelves. In Warehouse B any information put on the shelves has a
large chance of being lost within a few weeks, because of all the
thievery by the ten guaranteed lifetime employees who are larcenous and can steal
without risk, and because of all the rats that eat things on the
shelves. In the brain there would be an equally great loss of
any information stored, because of the rapid turnover of proteins.
The most popular theory of memory storage in the brain is that
memories are stored in synapses. But the proteins in synapses have an
average lifetime of only a few weeks. There are other types of
turnover going on. Synapses themselves have lifetimes of less than a
year, as do the protrusions known as dendritic spines and synaptic boutons. As discussed here, there is no understanding of how the brain could possibly store information long enough so that you could remember things that happened decades ago.
Just as Ed will never be able to figure out a system by
which Warehouse B could actually store decades of TV shows (in a manner allowing instantaneous retrieval) given the
limitations that the Supervisor has stated, our neuroscientists will
never be able to specify a detailed scenario by which a brain could
store memories for 50 years despite rapid protein turnover, and also
allow specific memories to be instantly retrieved in the way our
minds do, so that someone can name some obscure person, and you instantly
recall facts about such a person you haven't thought about in many
years. The most reasonable conclusion is that memories involve some
mental facility other than the brain. We don't know how such a
facility works, just as we don't have any reasonable idea of how a
memory like a human's could possibly work using a brain. But by postulating a non-neural basis for memory, we at least have a hypothesis that is not ruled out by what we know about the brain.
Nature never told us that a brain stores all a person's memories, and your body does nothing to suggest to you that you are retrieving memories from your brain. The idea that brains store memories is simply one that scientists gradually started assuming, without ever having sufficient evidence for such a conclusion.
In one respect, the brain is even less suitable for storing memories than the Warehouse B described here. I described Warehouse B as having boxes and shelves, which would allow for some type of grouping effect, in which related bits of information can be grouped together. But in a brain, physical grouping should be impossible. The brain is a mass of neurons, and the average neuron is connected to 10,000 other neurons. In such a system there would seem to be no way in which related data items can be physically grouped together like pages in a manila file, nor any way in which data can be arranged in a discrete sequence, with a start point and a stop point. As discussed here, such a system should not at all be suitable for storing long sequences, such as humans remember when they memorize songs, lists, and theatrical roles.