The magical number 7

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At the forefront of cognitive science in the United States was George A. Miller who, more than anyone else, adopted the information processing model. He was one of the first people to recognize that human memory works something like a computer – that is, it consists of two parts: an STM that keeps things temporarily handy and an LTM that stores them longer term. And he showed how the brain does both of these jobs.

Miller famously quantified the capacity as seven items in an essay titled “The magical number seven plus or minus two”. More importantly, he understood STM as an information processing system, a kind of filter that determines what is stored in LTMs. From this idea, other people, including Alan Baddeley, and Graham Hitch, developed a concept called “working memory”. Under the control of a “central executive”, working memory sorts out which data needs its attention and what data is to be passed on to LTMs.

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