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I write blogs whenever I study a technical topic. After a few months if I start thinking about that topic, my mind feels like a blank slate.

Does it mean that I never understood the topic in the first place? OR there can be some other reason of forgetting too?

P.S:
I do have a good memory. I still remember majority of the minor incidents that happened during my life.

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No, I cannot write on the paper (difficulty of maintenance). Blogs have to be on the computer. –  TheIndependentAquarius Jan 4 '13 at 12:10
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3 Answers

up vote 4 down vote accepted
+100

If these things did not have any emotional attachments (and you don't use that info on a regular basis), your brain just gets rid of that with all other useless trash (our natural built-in CLR garbage collection)

If you really want to remember these topics in the future, try to reinvent all that by yourself. Spend some time trying to figure it out and then (and only then) allow yourself to use information from the book. All these emotions (frustration, excitement of your discovery etc) will keep these topics in your mind for a long long time.


Update - there is one more thing you can do: in a few days (weeks) after you have studied a certain topic, explain this topic to someone else - real or imaginary audience

try to make it fun (it will help to anchor this info in your brain with positive emotions)

Lets say, some time ago I have studied a chapter about Polymorphism (part of OOP) - now I would select (at random) 2 things:

1) my virtual audience (choose from this list or pick your own: 5-yr old boy, Queen of England, Santa, Harry Potter and his friends etc)

2) additional info for this presentation (apples, rain, Beatles, global warming etc)

now - I would have to explain to Queen of England the connection between Polymorphism and rain (explaining in detail, what is Polymorphism in the first place)

I know it all sounds silly, but it really works, give it a try.

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thankful to you. –  TheIndependentAquarius Jan 5 '13 at 5:13
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It happens to everyone that's why the word revision was introduced. All you need to do is while studying any topic make notes and use diagrams to explain it(for science and maths especially) or try reading every sentence and explain it to yourself while looking in the mirror and revise the notes before a test or exam.

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It definitely does not mean that you didn't understand that topic at the time. Don't worry, I'm sure you understood those topics entirely, but understanding something and memorising it are not always one and the same.

There are two parts to memorising: 1. Creating mental associations and connections 2. Revision

Without both of these you can understand something perfectly at a given moment but forget it over time (which I'm sure is what happened with you).

I've given a little more detail below but the short answer is above :)

Mental Associations: Memory works by creating associations and connections in your brain - this is the foundation and the key. It's why one of the most ancient memory techniques in the Loci Method, where you create associations between the random objects you want to memorise (or numbers, or whatever they may be) and specific places either on a journey you know well (such as the route to work) or a location you know well (such as a house). Things that happen to you often have inbuilt associations to your life, no matter how minor those events were and for some people it's easier to create those connections than others. This is also why the other answer here refers to making diagrams to explain topics - one of the popular ways to do this is through mind mapping (a term coined by Tony Buzan). In fact, when learning how to speed read, students are often taught this method for organising the information they are capturing to aid the creation of those mental associations.

In your case, if you're studying a topic - and especially if it's particularly detailed or technical - you may simply not be actively creating these long lasting connections in your brain, but rather be studying that topic to understand it in the short term and have a good grasp of the subject without committing it to long term memory. This is perfectly possible as we often have to make a conscious decision to do this for topics which do not inherently form connections for us.

Revision: But even if we create lots of connections and this helps us remember something for a little longer, it is very unlikely you will remember it for a good amount of time without revision. In order to retain information you have studied, you need to revisit it regularly, otherwise it is both natural and healthy for your brain to forget. Once you have your notes in a condensed format (my preference for mind mapping comes from being able to see a lot of information in one place quickly), by spending just a few minutes reviewing them regularly you can remember a very large proportion more than if you don't look at those notes again. The method I was taught was that the optimal times to review your notes is after:

  • 1 day
  • 1 week
  • 1 month

If you really want to remember a topic, I would suggest jotting down in note form what you can remember from the last time you revised your notes before you even look at your original notes. This will also exercise your ability to recall.

Lastly, I know you mention that you can't use paper (which is what I use mostly for mind mapping) but there are many mind mapping applications out there (some free, some paid for). In fact, I'm going to go and ask that question now on the Webapps stack exchange, I'd quite like to try some out!

Hope this helps :)

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+1 for associations & strengthening those connections. –  Muz Jan 5 '13 at 0:54
    
thanks for the answer. –  TheIndependentAquarius Jan 5 '13 at 5:24
    
+1 Loci Method. –  juacompe Jan 30 '13 at 9:06
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