A Psycholinguistic Model of How the Human Brain Processes Language by Dr. Ed Vavra
In a famous study, George Miller demonstrated that, on average, STM can handle seven bits of information at a time.
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     Miller's primary experiment was based on giving a human subject a sequence of series of random numbers and asking the subject to repeat each series:

What he found was that most people can remember sequences of seven digits. Some people have trouble with sequences longer than five; most people have problems with sequences longer than nine. Miller's theory has been supported by numerous others, including a small one by a class of my own students. See Miller, George A. "The Magical Number Seven Plus or Minus Two: Some Limits on our Capacity for Processing Information." Psychological Review 63 (1956) 81-97.
 
 
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