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Working Memory is Full at Seven Digits
There is a reason that telephone numbers in Canada and some other countries around the world are seven digits long. Studies have demonstrated that our working memory – a newer concept than short-term memory and slightly different – that stores information for very brief periods (just long enough to understand them) can only hold a maximum of 7 digits on average. Essentially this length of time is just long enough to look up a telephone number and remember it to make the call.
