Recent extensive brain imaging of the visual cortex as people read text has provided important insights into how the brain perceives simple patterns. Some researchers believe that the key to understanding this transition is determining how and why humans first began to make repetitive marks. So it’s long been a mystery how these skills could appear some 5,000 years ago, with our brains suddenly acquiring the specific ability to make sense of letters. The part of the brain that processes visual information, the visual cortex, evolved over the course of millions of years in a world where reading and writing didn’t exist.
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