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I was playing Zynga's Draw Something when I saw an interesting icon:

enter image description here

A quick search of "tying fingers" produces results such as:

This is a carry-over from olden days when people tied pieces of cloth around any painful part of their body.

This cloth was tied in one area to keep the “spirit of life” in that area, and so cure it and keep the pain from spreading to other parts of the body. The string on the finger was designed to “keep” the thought there, to be remembered later when it was needed.

which looks immediately dubious. But there are also some "scientific" (or pseudo-scientific) claims like the accepted answer in the other QA website:

  • Yahoo Answers

    It's a little known fact that the nerves that define your sense of touch on your index fingers are the ones with the quickest connections routed directly to the hippocampus, the part of the brain responsible for memory. Tying a ribbon around the index finger means you constantly have a texture that's activating those nerves and thus keeping that part of the brain in alpha (high activity) mode. If you tie the ribbon (or wear a ring on your index finger, or any such apparatus) at the very moment you are trying to memorize something you mustn't forget later on, it associates that brain activity with said memory, keeping that pathway almost exclusively as a conduit for that memory.

That tying a knot on your fingers improves remembering things seems like a reasonable claim to me as a memory technique, since it is something unusual which you normally don't do unless you have something you want to recall later; but is it more effective compared to other arbitrary memory technique, say, drawing an "X" in the palm, or tying the leg, putting a pen in the breast pocket, etc.

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It's more immediately noticeable than a X on your palm (you can feel the knot). I'd also suspect you notice the pressure of a knot around your finger more than that around your ankle. I'd suspect that there actually is some reason for this. –  LanceLafontaine Aug 13 '12 at 0:22
3  
Anything you do that you will notice later as odd, will serve as a suitable reminder for something you might otherwise forget. Put a package in front of your front door, so you will trip over it on the way out, and you won't forget to mail it. Put your car keys in your Tupperware at a dinner party so you won't forget to take your dishes with you. Tie a string around your finger and when you see it, you'll think "Why is that there? O yes, I remember!". What claim are you questioning? That memory tricks help people remember things? –  Flimzy Aug 13 '12 at 2:10
    
@Flimzy: that this particular trick works better than any other tricks, as implied by the Yahoo Answer quote. –  Lie Ryan Aug 13 '12 at 2:40
    
I do this, I sometimes put stuff on my shoes to remember to print something the next day in the morning. Also, I put objects near my monitor and since I am very clean, I feel an intense feeling to move it away, but I won't touch it until the reminder is useless. It is very hard to do intense coding and debugging while paying attention if the dryer finished drying the clothes :) –  ajax333221 Aug 13 '12 at 3:45
    
Unless you tie the ribbon dangerously tight the sensation will dull over time, meaning evenetually you won't consciously feel it anymore. So I don't buy the "nerve explanation" in the Yahoo quote. –  Oliver_C Aug 13 '12 at 8:53

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