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RED–BLUE tool

Picture the mind as working like a laptop.

A laptop has a lot of files stored away in its hard-drive memory, where we can’t see them. We’ve forgotten most of the files, but they’re still there somewhere. Our mind is the same, with a huge number of files stored away in our unconscious mind, beyond our awareness.

The working surface of our laptop is the screen, which sits at the interface between the inside and outside worlds. We draw up information from memory storage (our inside world) and we also draw in information from the internet, or by inputting new data (our outside world).

Although it occupies the crucial interface position, the screen has a big limitation: we can only work on a small number of files or channels at a time, otherwise we quickly become overloaded and lose track of things.

working memorypre-frontal cortex

Though our long-term memory has enormous storage capacity, the capacity of our working memory is tiny. A famous psychology experiment in the 1950s showed that we can only hold between five and nine items in our working memory at any one time. (This is one reason why telephone numbers are usually seven or eight digits long, and why we break them up into chunks.) This experiment was later revisited because it was based on simple, learned sequences of items like numbers. When pieces of real-life information were used, the capacity dropped to just four or five.