One of the dogmas of modern biologists is that memories
are stored in the brain. No one has ever produced any direct evidence
establishing this claim, and there are many strong reasons for disbelieving it. One of these reasons is the lack of any plausible theory that
explains how humans are able to instantly remember specific pieces of
information when given some prompt such as the photo of someone's
face or that person's name. Another reason is that there is no
plausible theory that explains how humans could remember things for
50 years, such as humans can. The most popular theory of memory
storage is that memories are stored in synapses, but we know that the
proteins in synapses have short lifetimes, and they last for less
than a month. No one has given a credible explanation of how memories
could be stored for 50 years in synapses if there is such high
protein turnover in synapses.
But despite these very grave difficulties, our
neuroscientists keep telling us that our memories are stored in the
brain. Neuroscientists do not claim that this alleged act of memory
storage is some simple flow like the flow that occurs when you pour
milk from your milk carton into your cereal bowl. Instead,
neuroscientists claim that something called “encoding” occurs. We
are told that the things we learn or experience are somehow
translated into neural states, perhaps by some process that involves
chemicals, electricity, or microscopic changes in the brain. But no
neuroscientist has ever given anything resembling an exact
description of how this encoding could occur.
The
wikipedia.org article on “Encoding, memory” tells us that
“The process of encoding is not yet well understood, however key
advances have shed light on the nature of these mechanisms.” But no
such advances have actually occurred. The article then mentions “the
modification of neural synapses, modification of proteins, creation
of new synapses, activation of gene expression and new protein
synthesis.” But none of these things shed any light on how human
experiences or learned concepts could ever be encoded as neural
states, chemical states or electrical states. The wikipedia article
in question gives us only bluffing and digressions, without doing
anything to convince us that scientists have any understanding of how
memories could be encoded as neural changes, chemical changes or
electrical changes.
One reason for doubting that memories are encoded in
brains is that such a thing would require for there to exist (still undiscovered) a set of encoding protocols
so complex that they would be a miracle of design if they
existed. Encoding always requires some set of translation rules. For
example, human DNA uses a set of translation rules called the genetic
code to encode information; American writers use the encoding
protocols of the English language and the alphabet to encode
information stored on paper; and computers use the encoding protocol
known as the ASCII code to encode information stored in a computer.
As argued here, it would seem that a brain could only store memories
if it used a whole series of encoding protocols far more complex than
the ASCII code or the genetic code; and the origin of so many
sophisticated protocols would be impossible to naturally explain.
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
How could all of these very different types of information ever be translated into neural states or synapse states so that a brain could store them? If such encoding were to occur, it would be a miracle of complex design. Very oddly, the same people who tell us (without any sound basis) that such an encoding occurs are the same people denying design in biological organisms.
There
is another very strong reason for doubting that memories are encoded
in the brain: if the brain used a system of memory encoding, we would
have already discovered direct evidence of such a code; but we have
not discovered any such thing. Specifically:
If
brains actually stored encoded information, we would see
regularities and repetitions that would be signs of encoded
information, such as we see in the nucleotide base pairs of DNA,
where encoded information is stored; but we see no signs of any such
repetitions or regularities that might be the hallmarks of encoded
stored memories in the brain.
If
brains actually stored encoded information, there would have to be
many genes that support such encoding, such as the hundreds of genes
that support the transfer RNA molecules needed to carry out the
protein encoding used by DNA and the genetic code; but we see no
signs of any such memory-encoding genes in the human genome.
Let
me explain the first of these points. Encoded information has
regularities and repetitions that allow someone to tell that it is
encoded information. For example, before Europeans were able to read
hieroglyphics, they were sure that it was some type of encoded
information, because of the large amount of repetition of symbols.
When scientists first started to unravel DNA, they quickly figured
out it was some type of encoded information, because there was a very
high amount of symbol repetition. If we were to get radio signals
from intelligent extraterrestrials, it might be years before we would
be able to decipher such signals. But soon after we received signals,
we would at least be able to tell that they were from intelligent
beings and the signals contained encoded information, because of the
great number of regularities and repetitions we would see in the
signals.
It
therefore stands to reason that if some part of the brain (other than
DNA) contained encoded information, we would be able to see physical
evidence of such an encoding. When scanning neurons and synapses
with our electron microscopes, we would see regularities and
repetitions that would be the sign of encoded information. But we see
no such thing. If you look here, you can see electron microscope
photographs of tiny synapses smaller than a neuron. You will see no
sign of anything that looks like encoded information. Advanced
chemical analysis also have shown no signs of anything that had the
regularities and repetitions that are the hallmarks of encoded
information.
Some
may claim that the brain has encoded memory information, but that
it's just too tiny for us to see. Such a claim has little
credibility. Scientists were able to discover the microscopic encoded
information in DNA in the 1950's. Can we believe that 65 years later
science and medical technology is not advanced enough to discover
encoded memory information in the brain?
We know exactly what is in synapses, because we can view them with very high-resolution electron microscopes. Below we see a 2013 close-up electron microscope photograph of a synapse head, from the Okinawa Institute of Science and Technology (link). At the bottom we see a unit that has a length of 100 nanometers (billionths of a meter).
There is no sign of any encoded information in such synapses. We see none of the symbol repetition or token repetition that is a sign of encoded information. The little round things are balls of chemicals called vesicles. The vesicles are almost all the same size and shape. The vesicles are not stable, and travel across the dark line shown in the center of the photo (which is called a synaptic gap), as a nerve impulse travels. No one has credibly proposed any method by which such vesicles could represent stable encoded information. If we were to look at the same synapse head the next day, the arrangement of vesicles would be much different. Synapses bear no resemblance to any system for storing permanent learned information or long-term memories lasting for years. Synapses no more resemble a system for storing encoded information than do the snow drifts outside of a house in Alaska.
There is another place that we would expect to see a
large sign of a neural code for memories if it existed. If such a
thing existed, we would expect that there would be genes
supporting such a facility. But no such genes have been found.
Let's consider a comparatively simple case of encoded
information stored in the body, the case of the encoded information
in DNA. DNA mainly consists of nucleotide base pairs, and particular combinations of such pairs represent particular amino acids. This very simple type of use of encoded information requires hundreds of genes, what are called tRNA genes.
If human brains were to actually be translating thoughts and sensory experiences so that they can be stored as memory traces in the brain, such a gigantic job would require a huge number of genes – probably many times more than the 500 or so
"tRNA" genes that are used for the very simple encoding job of translating DNA nucleotide base pairs into amino acids. But we see no sign of any such memory encoding genes in the human genome.
There is a study that claims to have found possible evidence of memory encoding genes, but its methodology is ridiculous, and involved the absurd procedure of looking for weak correlations between a set of data extracted from one group of people and another set of data retrieved from an entirely different group of people. See the end of this post for reasons we can't take the study as good evidence of anything. There is not one single gene that a scientist can point to and say, “I am sure this gene is involved in memory encoding, and I can explain exactly how it works to help translate human knowledge or experience into engrams or memory traces.” But if human memories were actually stored in brains, there would have to be many hundreds or thousands of such genes.
The pie chart below shows human proteins by function:
This is a Wikipedia Commons file, and the page for the file gives the following table with the data used for the chart:
Function | Number of genes | Percent of genome |
---|
extracellular matrix protein | 72 | 0.40% |
protease | 476 | 2.80% |
cytoskeletal protein | 441 | 2.60% |
transporter | 1098 | 6.40% |
transmembrane receptor regulatory/adaptor protein | 84 | 0.50% |
transferase | 1512 | 8.80% |
oxidoreductase | 550 | 3.20% |
lyase | 104 | 0.60% |
cell adhesion molecule | 93 | 0.50% |
ligase | 260 | 1.50% |
nucleic acid binding | 1466 | 8.50% |
signaling molecule | 961 | 5.60% |
enzyme modulator | 857 | 5.00% |
viral protein | 7 | 0.00% |
calcium-binding protein | 63 | 0.40% |
defense/immunity protein | 107 | 0.60% |
hydrolase | 454 | 2.60% |
transfer/carrier protein | 248 | 1.40% |
membrane traffic protein | 321 | 1.90% |
phosphatase | 230 | 1.30% |
transcription factor | 2067 | 12.00% |
chaperone | 130 | 0.80% |
cell junction protein | 67 | 0.40% |
surfactant | 15 | 0.10% |
structural protein | 280 | 1.60% |
storage protein | 15 | 0.10% |
receptor | 1076 | 6.30% |
isomerase | 94 | 0.50% |
unclassified | 4061 | 23.60% |
Total | 17209 | 100.00% |
---|
Notice that there is no mention at all of any such category as "memory encoding proteins," nor any mention of "memory storage proteins" nor any mention of "memory retrieval proteins." The 15 proteins listed as "storage proteins" have nothing to do with memory storage. The wikipedia.org article on storage proteins describes them merely as "biological reserves of metal ions and amino acids."
If human episodic memories and human learned knowledge were to be translated into brain states, such a marvel of translation would require a massive number of proteins dedicated to such a task. But no such proteins have been discovered or identified.
Let's imagine a woman named Joan who is dating a man named Jack. Jack claims that he's one of the nation's most successful corn farmers. But one day Joan notices something very suspicious. At Jack's home there are no signs of any of the things that Jack would need to have to be a successful corn farmer. Joan notices that Jack's home merely has a modest back yard, and does not have any large field for growing corn. Joan notices that Jack does not own a tractor for planting corn or any other piece of farming equipment, and that in Jack's garage there are no signs of anything like food storage bins or seed sacks. Joan should suspect that Jack is not telling the truth when he claims to be one of the nation's most successful corn farmer.
Jack is similar to neuroscientists, and Jack's home and land is similar to the human brain. The human brain does not have the things it would need to have if the neural memory storage claims made by neuroscientists are correct. If it were true that the human brain stored memories, the human brain would need to have all of the following things:
- Some specialized physical biology in the brain capable of writing memories.
- Some specialized physical biology in the brain capable of reading memories.
- Some specialized physical biology in the brain capable of reliably storing memories for decades.
- Some specialized physical biology in the brain capable of retrieving memories instantly based on the most fragmentary hints.
- A huge number of proteins in the human body dedicated to accomplishing the incredibly difficult task of translating human episodic memories and human learned information into neural states or synapse states.
None of these things exist in the human brain. So the claims of today's neuroscientists are very much like the claims of Jack, claims that are contrary to the physical facts. Just as Jack's home bears no resemblance to a very successful corn farm, the human brain bears no resemblance to a device for permanently storing and instantly retrieving learned information.
Postscript: Below are some quotes:
- "There is no such thing as encoding a perception...There is no such thing as a neural code...Nothing that one might find in the brain could possibly be a representation of the fact that one was told that Hastings was fought in 1066." -- M. R. Bennett, Professor of Physiology at the University of Sydney (link).
- "No sense has been given to the idea of encoding or representing factual information in the neurons and synapses of the brain." -- M. R. Bennett, Professor of Physiology at the University of Sydney (link).