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Mnemonics for the number Pi

There once was a fellow from Greece,

Who forgot pi`s last decimal piece.

So he used electronics

To collect pi mnemonics...

Now he`s hooked, and there is no release.

Michael P. Masterson-Gibbons

Pi is the ratio between a circle`s circumference and its diameter. When expressed decimally it extends to infinity as a series of apparently random digits. It is useful to scientists to know approximately the value of pi, perhaps to two or three decimal places. If it is required to a greater accuracy, then generally calculators and computers can be used.

You may question, then, the usefulness of mnemonics for memorising pi to many more digits. It can only be for the challenge itself. One gentleman, Hiroyuki Goto, recited no less than 42,000 digits of pi from memory in 1995. This record feat took him about nine hours to complete.

References

  • Lorayne, Harry and Lucas, Jerry, The Memory Book: The Classic Guide to Improving Your Memory at Work, at School, at Play Ballantine Books; Reissue edition (1996) ISBN 0-345-41002-5.
  • History of the Major System
  • Mind Tools - The Major System
  • Pseudonumerology Totally dedicated to the Major System.
  • University of Amsterdam - Online Memory Improvement Course is an online step-by-step tutorial of the Phonetic Mnemonic System
  • Human Memory Online training for the Major System

Memory Records

The Guinness Book of Records lists people with extraordinary memories. For example, on July 2 2005, Akira Haraguchi managed to recite pi`s first 83,431 decimal places from memory, and the 2004 World Memory Champion Ben Pridmore memorized the order of cards in a randomly shuffled 52-card deck in 31.03 seconds. The authors of the Guinness Book of Records, Norris and Ross McWhirter, had extraordinary memory, in that they could recall any entry in the book on demand, and did so weekly in response to audience questions on the long-running television show Record Breakers. However, such results have nothing to do with eidetic memory and can be duplicated using mental images and the " method of loci".

Some autistics display extraordinary memory, as well as those with similar conditions like Asperger`s syndrome. Autistic savants are a rarity but they, in particular, show signs of spectacular memory.

Synesthesia has also been credited as an enhancement of auditory memory, but only for information that triggers a synesthetic reaction. However, some synesthetics have been found to have a more acute than normal "perfect color" sense with which they are able to match color shades nearly perfectly after extended periods of time, without the accompanying synesthetic reaction.

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