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
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 ERRORA 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.