Most neurologists assume
that your memories are stored in your brain. But the workings of
memory are a great mystery. We have no understanding of any exact
mechanism by which memories could be stored in the brain. Contrary
to hyped claims and certain unconvincing studies with a dubious
methodology, there is no convincing evidence that particular memories
are stored in particular places in the brain.
Scientists such as Karl
Lashley spent decades looking for particular parts of the brain where
particular memories were stored, and could not find them. Lashley's
research discovered all kinds of results hard to reconcile with the
claim that particular memories are stored in particular parts of the
brain – such as rats that suffered almost no loss of ability to
remember some kinds of mazes, even when up to 50% of their brains
were removed. The doctor John Lorber discovered astonishing cases
such as a student who was doing very well in college, even though
almost all his brain had been destroyed by disease. More recently,
there was the case of a French civil servant who was astonished to
discover that almost all of his brain had been destroyed by disease.
This hadn't stopped him from doing his government job.
The evidence from memory
research is sufficiently muddied and unclear that there is definite
room for an argument against the idea that your brain stores all your
memories. I will now present such an argument. I can summarize the
argument as follows: when we analyze in detail what a brain would
need to do on a low-level in order to store memories, we find that
the brain would need to use a whole set of encoding protocols so
sophisticated that they could not have naturally arisen.
To explain this argument I
must first explain what is meant by an encoding protocol. To
understand the idea of encoding memories, you have to realize that
there is pretty much no such thing as “just storing” information.
Almost every type of information that we know of involves some type
of encoding. Encoding is when information is stored using some
particular system of representation.
Let me give some examples
to clarify the idea. Consider the storage of written words. A system
of symbols (the alphabet) may be written to store the words. Each
time someone types the letters “cat” to mean a cat, that person
is using an encoding protocol known as the alphabet.
When words are stored on a
computer or smartphone, multiple levels of encoding are involved.
First, there is the alphabetic encoding. Then there is what is called
an ASCII encoding. The individual letters are converted to numbers,
using an ASCII table that signifies how particular letters will be
stored as particular numbers. Then there is a binary encoding by
which numbers such as 34 written in the base 10 system are converted
to a series of 1's and 0's such as 100101101.
ASCII is an encoding
protocol representing letters as numbers
We see in the diagram below three different types of encoding going on when the word “cat” is stored on a computer.
When an image is stored on
a computer, there are also multiple types of encoding going on. The
image is broken down into a grid of pixels; each pixel is translated
into a number indicating a particular shade of color; then those
numbers are translated into binary form that is ideal for storing on
a computer hard drive.
Encoding of a visual image
Now let us consider how
the brain might store memories. Just as there is pretty much no such
thing as “just storing” information on a computer, without using
some type of encoding, there could be no such thing as “just
storing” a memory in the brain. If we are to imagine that the brain
stores memories, we must imagine that the brain somehow does encoding
to get the memory stored to the brain.
It is hypothesized that
the brain might store memories using things such as molecules or
nerve cell electrical states. But just as information must always be
encoded before it can be stored on a hard drive, there would need to
be encoding before any memory information could be stored in
something like molecules or electrical states. For example, we
cannot imagine that a molecule would ever directly store some letters
that we could see using an electron microscope that might show a tiny
little “Y” and “G” on a molecule. Nor can we imagine that if
we scan your brain with an electron microscopic, we would find tiny
images representing scenes from your life, images that could directly
be seen in the electron microscope's closeup photos. Instead, if the
brain stores memories, there would need to be some low-level encoding
causing the memories to be stored in a way that can efficiently be
represented by molecules or nerve cell electrical states or neuron
connections.
But here a very great
difficulty arises. The problem is that human memories include an
incredibly diverse collection of things. Consider only a few of the
types of things that can be stored in a human memory:
- Memories of daily experiences, such as what you were doing on some day
- Facts you learned in school, such as the fact that Lincoln was shot at Ford's Theater
- Sequences of numbers such as your social security number
- Sequences of words, such as the dialog an actor has to recite in a play
- Sequences of musical notes, such as the notes an opera singer has to sing
- Abstract concepts that you have learned
- Memories of particular non-visual sensations such as sounds, food tastes, smells, pain, and physical pleasure
- Memories of how to do physical things, such as how to ride a bicycle
- Memories of how you felt at emotional moments of your life
- Rules and principles, such as “look both ways before crossing the street”
- Memories of visual information, such as what a particular person's face looks like
Now given all these types
of things that can be remembered, there would seem to be two
possibilities if the brain is storing all your memories:
Possibility 1: The
brain has a single “all-purpose” encoding system that somehow
works for all of these extremely diverse types of memories.
Possibility 2: The
brain uses many different types of encoding protocols; and when it is
time to store a memory, the brain somehow figures out the appropriate
encoding protocol to use.
The problem is that
neither of these options seem credible.
Given the incredible
diversity of the various types of memories listed above (which is not
even a complete list of all the types of memories that can be
stored), it seems unreasonable to imagine that there could ever be
any universal “all purpose” encoding system that could work with
things as dissimilar as memories of smells, miscellaneous learned
facts, principles of living, and long sequences of musical notes or
letters. It would seem that many of the types of memories would
require their own distinctive type of encoding system.
But it also seems very
hard to imagine that the brain could encode memories by using a
variety of encoding schemes, and selecting the appropriate encoding
scheme to use at the moment that a memory is stored. The problem
with that idea is that it requires for us to believe that the brain
subconsciously is able to instantly figure out what type of
information a memory is, and to then select the appropriate encoding
scheme. That would seem to involve some incredibly sophisticated
instantaneous analysis, and how could such a thing all be going on
subconsciously?
It seems very hard to
believe, for example, that if you meet some young woman at a party,
and ask for her phone number, that behind the scenes your brain
subconsciously is acting like this: well, well, I have a face to
store, so let me use the “visual data encoding system” I have
stored in such and such a place; and for the phone number let me use
the “numerical sequence encoding system” I have stored in some
other place; and to store her name let me use the “alphabetic data
encoding protocol” I have stored in some other place; and to store
the scent of her perfume, let me use the “smell encoding system”
I have stored in some other place. All
this classification and selection seems to be far too much work to be
done subconsciously. Nor can we believe that a selection of
encoding systems occurs consciously, for we never (or virtually never)
have any conscious thoughts about what type of encoding protocol to
use when we remember things.
In
short, explaining how encoding could work on a low-level to store
memories is a practical nightmare. Our psychologists say that some
encoding is going on when memories are stored, but none of them has
succeeded in presenting a plausible and detailed description of
exactly how such encoding could work. When discussing the issue,
psychologists and neurologists will typically combine speculation and
tangential findings in a way that will skillfully hide their lack of
any mechanism for how such encoding could occur.
When
we consider the storage of multifaceted or abstract ideas, it is
hard to think of how encoding could possibly work. How, for example,
could your brain possibly do some encoding that would represent your
mother or the concept of treating people equitably or the idea of the
United States as some series of electrical states in the brain, some
molecular states, or some combination of the two? We cannot imagine
any such encoding.
How
can we escape such difficulties? We can abandon the materialist idea
that your memories are all stored in your brain. We can believe that
our minds are some mysterious spiritual or soul reality, and that
memories are part of such a reality. If we no longer have to believe
that all memories are being stored in particular parts of the brain,
all of the difficulties in explaining memory encoding conveniently
disappear. We could still continue to believe that our brains store
some things that are rather loosely called memories, such as what are
called motor memories, remembrance of how to do particular movements
of parts of the bodies. But by believing that conceptual memories and
experiential memories are part of some non-physical reality that the
human mind is part of, we free ourselves from the seemingly
impossible burden of having to explain how the brain could possibly
have naturally developed encoding protocols that could represent such
things.
We
know of one encoding protocol that is definitely used by living
things: the genetic code. This is the protocol by which particular
amino acids are represented by particular trios of nucleotide bases. The genetic code is an encoding protocol roughly as
complicated as the ASCII protocol.
The genetic code
But
how did this genetic code ever appear naturally? This is a major
explanatory nightmare for naturalists. The natural origin of the
genetic code has never been plausibly explained.
But
consider how great are the difficulties of a materialist who believes
all of your memories are stored in your brain. It would seem that for
memories to be stored in the brain, it would have to be that there
naturally arose not just one sophisticated encoding protocol (the
genetic code), but many such sophisticated encoding protocols –all
the different encoding protocols needed to store our many different
types of memories in our brains. The theorist who claims that your
memories are all stored in your brain is like someone burdened by ten
albatrosses hanging from his neck, each albatross being the burden of
explaining how one of these encoding protocols could have naturally
arisen. I haven't even mentioned the issue of decoding, which
further doubles the explanatory burden of someone believing that the
brain stores all your memories, by requiring such a person to believe
that the brain also has a whole set of decoding protocols that are
mirror images of the encoding protocols, decoding protocols used in
retrieving stored memories that had been encoded using the encoding
protocols.
It can
be powerfully argued that if we have to believe that all of these
sophisticated encoding protocols exist, this should make it ten times
more difficult to explain how humans naturally came to exist. But
there is an alternative. By believing that the mind has a spiritual
reality or soul reality, we free ourselves from the burden of having
to explain all these sophisticated encoding protocols that we would
need to store all our memories in the brain – for we no longer have
to believe that our memories are all stored in the brain.
The
argument I have given here is only one of several arguments that can
be made against the claim that your brain is storing all your
memories. In my next post I will discuss another argument against
such a claim --- what I will call the navigational argument. This is
the argument that if your brain were to store an experience memory or a
conceptual memory in some particular place in your brain, your brain
would never be able to instantly find the location where that memory
was stored. In still another post, I will argue that the brain lacks
the biological features we might expect to find in a system capable
of storing complex experience memories for 50 years, and that facts such as synapse
turnover undermine attempts to explain how the brain could be storing
experience memories for 50 years.
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