How many things can we can we hold in mind at a time?

Do you know the magical number seven? Actually it is seven, plus or minus two (7±2), that is the limit on our capacity for processing information. Now, the number has shrunk to four, a new study finds. The researchers investigated the neural basis of this capacity limitation in monkeys performing the same test used to explore working memory in humans. They found that that the monkeys (and by extension humans) do not have a capacity of four objects, but of two in each hemisphere. Figuring out how the brain handles objects is important because working memory ability reflects the cognitive power that is measured by IQ scores, or the ability to learn a second language (via

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