![]() ![]() On our way, we also discover many fascinating facts: for example, because Chinese names for numbers are so short, Chinese people can remember up to nine or ten digits at a time - English-speaking people can only remember seven. But how then did the brain leap from this basic number ability to trigonometry, calculus, and beyond? Dehaene shows that it was the invention of symbolic systems of numerals that started us on the climb to higher mathematics, and in a marvelous chapter hetraces the history of numbers, from early times when people indicated a number by pointing to a part of their body (even today, in many societies in New Guinea, the word for six is"wrist"), to early abstract numbers such as Roman numerals (chosen for the ease with which they could be carved into wooden sticks), to modern numbers. ![]() Further, Dehaene suggests that this rudimentary number sense is as basic to the way the brain understands the world as our perception of color or of objects in space, and, like these other abilities, our number sense is wired into the brain. In The Number Sense, Stanislas Dehaene offers general readers a first look at these recent stunning discoveries, in an enlightening exploration of the mathematical mind.Dehaene, a mathematician turned cognitive neuropsychologist, begins with the eye-opening discovery that animals - including rats, pigeons, raccoons, and chimpanzees - can perform simple mathematical calculations, and he describes ingenious experiments that show that human infants also have a rudimentary number sense (American scientist Karen Wynn, for instance, using just a few Mickey Mouse toys and a small puppet theater, proved that five-month-old infants already have the ability to add and subtract). ![]() There are still perplexing mysteries - how, for instance, do idiot savants perform almost miraculous mathematical feats? - but the picture is growing steadily clearer. But in recent years there have been many exciting scientific discoveries, some aided by new imaging techniques - which allow us for the first time to watch the living mind at work - and others by ingenious experiments conducted by researchers all over the world. Our understanding of how the human brain performs mathematical calculations is far from complete. ![]()
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