ForumsWEPRForgetfulness

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Moegreche
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Moegreche
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Duke

Thought this may be something fun to think about besides.... the usual.

So we all have a capacity (some might say a cognitive capability) to remember things. Our memory is a pretty mysterious thing, but it has a certain relationship to the truth and we certainly seem to have some idea about when memory is successful. But what about when it's not? That is, what about when we forget things?

There are two aspects here that I think are rich for discussion:

1) Is there some way to identify 'forgetting X' in a philosophically significant way? Are there different states of forgetfulness? For example, we may have no idea the event obtained (completely forgetting something). Or maybe we have some inkling that something happened but can't place it. An example of this might be talking with your friends about a particular movie. You know you've seen the movie but you just can't remember the title. But these seem like two different kinds of forgetfulness - especially when you consider the phenomenological aspects of each. (Consider what it's like to have no memory of something whatsoever versus something's being on 'the tip of your tongue'.

2) There's a further aspect: if part of human intelligence is the capacity for forgetfulness, how could we program this into a being that's supposed to have artificial intelligence? One way of putting this is to say that if the brain is nothing but chemicals, proteins, neurons, etc., then we could, in principle, make an artificial brain. But how can we account for forgetfulness?

So, to sum up, two ways of thinking about forgetfulness: epistemically and logically.

Thoughts?

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Dewi1066
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Dewi1066
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Nomad

I view memory as a series of strands connected together in an illogical pattern.

The reason I believe this is I suffered from memory loss after brain surgery 10 years ago. I had emotional amnesia which meant that I could function quite normally in day to day activities, but when it came to emotions, memories of people I had been emotional about or even events, I could not remember them. I was blank.

A good example is the death of a member of the Royal family here in the UK. Everyone else seemed to know where they were at the time, the details of the death and even how they felt at the time. I didn't even know it had happened or who they were talking about. Yet at the same time I could hold a reasonable discussion about the Roman empire or the beginnings of the political system here in the UK.

This at the time led to a bizarre scenario where I could remember how to drive a car or use a computer, but I couldn't remember my son or my partner. Nor could I remember friends or other family. I couldn't read emotions on people's faces and this led to around 4 years of chaos.

My scans immediately after the surgery showed a huge hole in the centre of my brain where the tumour had been removed, but over time the scans showed the gap gradually filling back in with brain matter, occupying the space where the tumour once sat.

I experienced a rapid acceleration in learning for a period of around a year where I seemed to be like a sponge for knowledge, but then I started having what I thought were nightmares whilst I was awake, but they turned out to be partial memories. They didn't come back all at once, but in floods of disjointed memories that bore no relation to each other.

It is difficult to describe the emptiness I felt when I first came round from the operation, and even harder to explain what it was like not to recognise myself or indeed even know my own name, but as I say, if memory is a series of illogically connected strands it would certainly explain why clumps of memories have returned at the same time. A clear memory from the time was sitting in a garden chair, not thinking about anything. I heard what I considered a loudish noise and turned my head to see what I now know is a grasshopper. I focused on it and I could hear it really clearly. The rest of the world didn't matter and the noise of nearby traffic disappeared, as did any other noises you'd expect in an suburban area during the day. All I could hear or focus on was that grasshopper.

I think making an artificial brain would be difficult simply because so little is known about the organic brain. We may, as a species, understand more than we did in the past, but we are nowhere near understanding how it does what it does. Reproducing an artificial organ on this basis would seem impossible at the present time.

Moegreche
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Moegreche
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Duke

Yet at the same time I could hold a reasonable discussion about the Roman empire or the beginnings of the political system here in the UK.


This touches on one of the key features of forgetfulness: some pieces of information are more subject to being forgotten than others. Is there some way to account for this given a certain biological state? I suppose we could say something about where in the brain the relevant information is being stored, but why wouldn't all information in that area be subject to being forgotten?

This at the time led to a bizarre scenario where I could remember how to drive a car or use a computer, but I couldn't remember my son or my partner.


So here we have a distinction between two kinds of knowledge: know-how and know-that (or propositional knowledge). Very interesting, although I'm sure for you it was quite unnerving.

I think making an artificial brain would be difficult simply because so little is known about the organic brain.


I definitely think you're right here. I'm just wondering whether a phenomenon like forgetfulness can show that we cannot make an artificial brain as a matter of principle, rather than a matter of fact.
Dewi1066
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Dewi1066
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Nomad

One thing I regret is that I was asked to take part in a study of my condition at Liverpool University. I refused simply because I was having difficulty coping with day to day life at the time and I didn't want the added strain. The consultant who wanted me to take part explained that it was exactly what you've mentioned that they wanted to study. Why had I forgotten the emotional but kept what, for all intensive purposes, was the logical reasoning and factual information centre of my memory.

I may well look into it again now in the New Year and see if I can still take part in the study. If it helps just one person it would be worthwhile.

You're right, it was unnerving, but it had its benefits. Before my operation I was terrified of spiders. After, I can now pick up a spider without so much as a wince. My temper was shorter before, but I'm told that could have been the tumour applying pressure on certain parts of my brain.

I hope there are some advances in this area of study as nobody appeared to know what to do with me when I lost my memory. They tried to understand, but it was a lonely period of my life until I met a girl that helped me slowly to accept what had happened and explained that forgetfulness is natural as you get older. Perhaps some of the things I can't remember still is just due to my age and natural forgetfulness, but I tend to hyper focus.

Forgetfulness shouldn't prevent the creation of an artificial brain, but perhaps reasoning and emotion should.

Freakenstein
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Freakenstein
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Jester

Hey there Moe! How's it been for ya? I am totally not prepared to discuss all of this, seeing as how this is the first philosophical thread in the WEPR in FOREVA. So I'll just choose one lol

2) There's a further aspect: if part of human intelligence is the capacity for forgetfulness, how could we program this into a being that's supposed to have artificial intelligence? One way of putting this is to say that if the brain is nothing but chemicals, proteins, neurons, etc., then we could, in principle, make an artificial brain. But how can we account for forgetfulness?


Way back in Psychology class, which was more than 2 years ago, we learned about memories, and the more-leading theory on how they are forgotten and are gained. Seriously, we still don't know jack about memories and how they are formed. These memories are formed by neurons in packs. They are linked together. Aaaand...searching for said memory requires the firing of the neurons to locate it. Learning a memory without constant firing will cause it to just be a short term memory, which can make it disappear pretty easily. However, if you keep firing the neurons to keep retrieving the memory, it will become a priority. This long term memory will take a long time of not being used before it disappears. As for the disappearing part, I have completely forgotten. So I don't want to just guess and have the possibility of spewing BS.

On the topic of Artificial Intelligence, we will most likely be basing this off computers. Computers are designed to keep anything and anything stored retrievable with one command. If we were to implement Artificial Intelligence, the machines using it will learn, but not forget, because they will be under the design of computers. If we were to simulate it like an actual human brain, we will first have to understand more about how memories are formed and how they are lost, if engineers ever wanted machines to forget.
SSTG
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This touches on one of the key features of forgetfulness: some pieces of information are more subject to being forgotten than others. Is there some way to account for this given a certain biological state? I suppose we could say something about where in the brain the relevant information is being stored, but why wouldn't all information in that area be subject to being forgotten?

Could it be due to the fact that one memory is visual and the other is related to the touch like driving (It's a manual action). For example, when I was in school I could learn better when I wrote something rather than just reading it. The information might be stored differently in the brain whether it's an emotional, visual and tactile memory.
Dewi1066
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Dewi1066
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Nomad

The visual and tactile memory would have merits for the driving a car skill, but what about my memory of history? Where did that come from? It isn't visual or tactile, it is learned, much like you learn the emotional relationships that form who you are.

It's a tricky one. I've puzzled over it probably more than most because a period of my life was spent without the benefit of having a memory of my emotional life. I didn't know emotion and I was nicknamed Data by my friends simply because I couldn't work out what was happy or sad.

Memory is a mystery even now. It may seem like we've taken huge leaps in sciences, but we don't even understand the basics of the way the brain works. I'm living proof.

SSTG
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SSTG
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The visual and tactile memory would have merits for the driving a car skill, but what about my memory of history? Where did that come from? It isn't visual or tactile, it is learned, much like you learn the emotional relationships that form who you are.


I don't know, maybe it's the emotional attachment to an event that makes it more memorable (just to play with words ).
Sometimes we remember traumatic events even when we were 3 yo so there must be something there like the pain (physical & emotional) caused by an accident must have some kind of priority for the brain.
I like to imagine that everything I learn is stored in a drawer in my head and the more knowledge I acquire, the less room I have to store them so I throw away what's not as important so I forget.

Also think about all the info that our brain sends to the muscles and members, etc. If the brain does not function properly you might not be able to walk, speak, etc.
I remember when I was in school and I was working on something hard and I couldn't figure out the answer I would take a break, listen to music or ride my bike, etc., and later I would find the answer.
Why is that?

Now my memory is not as good as it used to be when I was younger. I used to watch Jeopardy and I had about 95% of the answers (90% right) before the contestants would even hit the buzzer but now I'm not so hot.
MageGrayWolf
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Farmer

Forgetfulness shouldn't prevent the creation of an artificial brain, but perhaps reasoning and emotion should.


Why would that prevent the creation of an artificial brain? These abilities emerge from the similar properties that memories do. I would suspect there is more than just the interconnectivity of the neurons but the electrochemical processes there in.

This might be of interest to this topic.
http://edition.cnn.com/2009/HEALTH/01/28/memory.research/index.html
SSTG
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SSTG
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The article about procrastination is interesting.
Also the Why so many minds think alike article made me think about how a person's brain gets more active when surrounded by other people rather than being alone all the time.
I guess you can drive someone insane by isolating him or her for a long period of time (cut from radio, TV, computer, Internet, reading material).

I remember how much I used to enjoy being in school and learning new stuff. The interaction with other people in a class environment is also important for the brain stimulation. Competition among students as well can have a good effect on the brain.

Darkroot
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Peasant

Ahh, goody goody my two expertise's cognitive psychology and A.I. it's like a Christmas present.

COMMENTS AND MISTAKES

But what about when it's not? That is, what about when we forget things?


I assume this is long term memory and not short term since short term memory loss is more based in environmental interference and attention.

Let just do some basics of long term memory. Long term memory is pretty much everything 30 seconds ago all the way to your earliest moments of childhood. The detail in these memories is dependent on how recent they are, the more recent the more vivid. But this isn't the governing rule. Emotions can also make us pay more attention and consolidation can make the information easier to encode and retrieve.

The visual and tactile memory would have merits for the driving a car skill, but what about my memory of history? Where did that come from? It isn't visual or tactile, it is learned, much like you learn the emotional relationships that form who you are.


Visual and tactile are not the predominant for of coding it's actual semantic encoding which is based on the meaning of the stimulus which is basically everything you learn.

From that you have Implicit and explicit memories which are unconscious and conscious memories

http://img804.imageshack.us/img804/1028/ltm.png

Semantic knowledge also plays in the role of the formation of episodic memories since the more you know about the situation the better you are able to tie it in with those details.


I view memory as a series of strands connected together in an illogical pattern.


It might seen illogical to you but trust me the biology or how consolidate information is really complex and highly refined process.

Also another important aspect of the question is that forgetfulness can be retrieval failure.

Memory is a mystery even now. It may seem like we've taken huge leaps in sciences, but we don't even understand the basics of the way the brain works. I'm living proof.


We have done a great deal of research on it and with the help of brain scanning technology. I'm not familiar with your condition exactly but I know a great deal of the biology that happened at that point. But the propagation of effects on your cognition I don't know since the brain doesn't really cluster everything nicely together for our benefit. But it sounds like Psychogenic retrograde amnesia that has a organic cause the tumor. But being young and having the entire tumor removed would result it your brain healing due to plasticity.

Sometimes we remember traumatic events even when we were 3 yo so there must be something there like the pain (physical & emotional) caused by an accident must have some kind of priority for the brain.


Those are called fkashbulb memories but recent studies show that there is nothing special about them it's all about emotions and chemicals that are released to help us remember the event in greater detail.

Also think about all the info that our brain sends to the muscles and members, etc. If the brain does not function properly you might not be able to walk, speak, etc.


Muscles are controlled by the motor cortex sometimes overuse a finger mostly in musician causes problems by how the motor cortex devotes more space for that body part and sometimes overlaps with others. Thus one finger may overlap with another one pretty much ending the musicians career.

I remember when I was in school and I was working on something hard and I couldn't figure out the answer I would take a break, listen to music or ride my bike, etc., and later I would find the answer.
Why is that?


The most used explanation for this is that either taking a break resulted you taking a new perspective or that you brain was still processing the information while you were doing other things that didn't require you to think that hard. A famous example of this that a scientist couldn't find the solution to the problem so he went to sleep and he had a dream of a solution. I can't find it on google but I know it there and it's not the only one of it's kind. Cognition is complicated thought we use different mechanisms for different problems

These memories are formed by neurons in packs. They are linked together. Aaaand...searching for said memory requires the firing of the neurons to locate it.


It's not really that they are location it's more of a complex network that activates areas that propagate through, not that they actively seek out the solution. Some links are stronger and others are weaker the brain constantly prunes out weaker links and strengthens links that through feedback are deemed important.

Learning a memory without constant firing will cause it to just be a short term memory


It's more of a cognitive than biological different neurons still fire, pretty much everything requires a neuron and a action potential.

However, if you keep firing the neurons to keep retrieving the memory, it will become a priority. This long term memory will take a long time of not being used before it disappears. As for the disappearing part, I have completely forgotten. So I don't want to just guess and have the possibility of spewing BS.


That's part of the pruning process and most new research believes it happens in sleep that why learning before sleep results in better memory since unimportant connections are lost and important ones a strengthen.

FORGETTING AND MEMORY ERROR

A complicated topic since it spans different parts of cognition. Source monitoring which is misidentifying sources of the memory is a big problem. This can lead to cryptomnesia which is when we come up with a new idea but it was really from someone else thus plagiarizing without every knowing about it.

Inferences in which we make by on experience and knowledge but end up being wrong like if you tell a group that someone was pounding a nail and another looking for a nail and then test them with a sentence that has using a hammer on a nail they are like to make an inferences of hammer due to being closely tied to the nail thus a mistake.

Retroactive interference when something in the past interferes with retrieval of new memories.

The scary part is false memories when people create memories just on the basis of someone telling them they did and giving them information about it and around this they can create a vivid memory of the experience that did not even happen.

Again attention is a big issue I won't go into detail but it play a big role along with the constructive nature of memory and inference that we make.

But I'm deviating forgetting is really based on the connections being weak or structured in a fashion that does not lead to the activation of the memory.

There are a lot of other factors but this sums up what errors happen.

2) There's a further aspect: if part of human intelligence is the capacity for forgetfulness, how could we program this into a being that's supposed to have artificial intelligence?


It's actually not that hard they have already made some progressive in artificial neural nets that make connections and strengthened and weaken them based on the feedback of correct or incorrect.

Forgetting can be easily programmed in by making it so connections weaken over time and if they are not used. After a while they are pruned out by the program. This would be an important function if the A.I. doesn't have enough memory and thus weak links need to be pruned out to make space for new information.

One way of putting this is to say that if the brain is nothing but chemicals, proteins, neurons, etc., then we could, in principle, make an artificial brain. But how can we account for forgetfulness?

Well the brain is slightly more complicated since it's more than it's parts but in theory it's entirely possible.
http://en.wikipedia.org/wiki/Artificial_neural_network


Anyway that was one one huge wall of text and I'm pretty sure it's mostly correct but I am only a 3rd year student of both majors so there could be some errors.

If anyone wants I can go into more depth of some of the issues or topics but keep in mind the above is just a really rough skim of the topics people brought up.
Masterforger
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Forgetfulness is the height of human cognitive error, and if one incorporated that into a computer, it probably wouldn't work.
The main reason computer exist is to make our lives easier and to remember things we couldn't remember, i.e entire books.
Maybe

Darkroot
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Peasant

Forgetfulness is the height of human cognitive error, and if one incorporated that into a computer, it probably wouldn't work.
The main reason computer exist is to make our lives easier and to remember things we couldn't remember,


We prune links because we don't have an infinite store for memory there are cases where individuals remember almost everyday of their lives in detail but this overwhelms them by constantly activating the memories and trouble learning new information. Thus forgetting things that are not important is a necessary process for managing resources and storage. Well we are not talking about computers we are talking about A.I. and even hardware has limits on processing cycles and storage.
MageGrayWolf
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Farmer

Here is another link that might be of interest to this thread.

http://www.wisegeek.com/what-is-the-capacity-of-short-term-memory.htm

Short-term memory is the first place that information is stored when it enters your brain, and it functions in a manner similar to a holding area. The capacity of short-term memory is between five and nine items, often referred to as "seven, plus or minus two." The items only remain there for about 30 seconds unless the person makes a conscious effort to retain them. The size of the pieces of information doesn't appear to make a difference, as each one could be as small as single letter, or as long as a whole phrase. If they are retained, the items are eventually transferred to long-term, or permanent, memory.

When information enters a person's brain, the first place it stops is the short-term memory, which has a very limited capacity. Only a few items can fit in short-term memory at a time, and they can't stay there for very long before they are either forgotten or stored in long-term memory. The generally accepted limit for the capacity of short-term memory is seven items on average. This number is based on the research of cognitive psychologist George A. Miller, who defined the capacity of short-term memory as seven items plus or minus two. He found that the majority of people could process about seven pieces of information at a time in short-term memory, with some people only able to handle five, and individuals at the upper levels retaining nine.

The limited capacity of short-term memory means that most people can only handle a small amount of information at one time. Without a conscious effort to remember, such as repetition of the information, the items will only be retained for about 30 seconds before they are forgotten. Each piece of information can be any size. For example, each digit of a phone number can be a separate item, or the whole phone number can be treated as a single chunk of information. Another example is that each piece of information could be a single letter of one word, the whole word could be treated as an item, or even an entire phrase.

One way to handle more information at one time is to organize it into chunks, such as remembering a phrase or a whole phone number. This can effectively increase the limits imposed by the capacity of short-term memory, helping a person fit a lot more information into that part of the brain because each item is bigger. New items tend to push out older ones, but if the person practices the information with repetition it can be retained instead of forgotten. Items that are retained and learned in this manner usually are transferred to long-term memory for permanent storage.
Darkroot
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Darkroot
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Peasant

"seven, plus or minus two." The items only remain there for about 30 seconds unless the person makes a conscious effort to retain them


Actual newer research shows it's smaller sadly, like 4 plus minus 2 I think. Conscious effort is repetition and if you are not allowed to repeat the information does not consolidate.


permanent, memory.


If only, I think my prof made fun of that once.

New items tend to push out older ones, but if the person practices the information with repetition it can be retained instead of forgotten.


That's not entirely true. It implies that all new information is remembered and the old one isn't but when you take a list and read your way through it you remember the first and last part better than the ones in the middle.


Yeah chunking is a good way to remember. But there are many other techniques to improve memory. Also good chunking techniques are pretty hard to employ but usually result in better memory for whatever type of information you trained for.

The articles don't seem to be written by professional. More like a student or very savy English major also outdated too.
MageGrayWolf
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Actual newer research shows it's smaller sadly, like 4 plus minus 2 I think. Conscious effort is repetition and if you are not allowed to repeat the information does not consolidate.


From what I can tell this was proposed in 2001 by a Nelson Cowan.

http://www.ncbi.nlm.nih.gov/pubmed/11515286

There was this method of memory building I would use in school. I would remember my assignments from the board instead of writing them down. At first I did write them down but as I got better I didn't.
A first since the assignment was new each day I would try to memorize it and when I got home i would try to recall what the assignment was first before looking at the paper I wrote it down on, then I would double check to see if I was right. As I did this each day with the different assignments I got to the point where I not only didn't need to write it down or double check but I could just glance at the assignment and commit it to memory. I found this helped improve memory over all as well. Though today I'm a bit out of practice.
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