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not only did the brains of the mental athletes appear anatomically indistinguishable from those of the control subjects, but on every test of general cognitive ability, the mental athletes’ scores came back well within the normal range.

There was, however, one telling difference between the brains of the mental athletes and those of the control subjects. When the researchers looked at the parts of the brain that were engaged when the subjects memorized, they found that the mental athletes were relying more heavily on regions known to be involved in spatial memory.

just about anything could be imprinted upon our memories, and kept in good order, simply by constructing a building in the imagination and filling it with imagery of what needed to be recalled. This imagined edifice could then be walked through at any time in the future. Such a building would later come to be called a memory palace.

Memory training was considered a centerpiece of classical education in the language arts, on par with grammar, logic and rhetoric. Students were taught not just what to remember but how to remember it. In a world with few books, memory was sacrosanct.

In his essay “First Steps Toward a History of Reading,” Robert Darnton describes a switch from “intensive” to “extensive” reading that occurred as printed books began to proliferate.

Until relatively recently, people read “intensively,” Darnton says. “They had only a few books — the Bible, an almanac, a devotional work or two — and they read them over and over again, usually aloud and in groups, so that a narrow range of traditional literature became deeply impressed on their consciousness.” Today we read books “extensively,” often without sustained focus, and with rare exceptions we read each book only once. We value quantity of reading over quality of reading.

“Rhetorica ad Herennium” underscores the importance of purposeful attention by making a distinction between natural memory and artificial memory:

Our hunter-gatherer ancestors didn’t need to recall phone numbers or word-for-word instructions from their bosses or the Advanced Placement U.S. history curriculum or (because they lived in relatively small, stable groups) the names of dozens of strangers at a cocktail party. What they did need to remember was where to find food and resources and the route home and which plants were edible and which were poisonous

What distinguishes a great mnemonist, I learned, is the ability to create lavish images on the fly, to paint in the mind a scene so unlike any other it cannot be forgotten. And to do it quickly. Many c

the three stages of acquiring a new skill. During the first phase, known as the cognitive phase, we intellectualize the task and discover new strategies to accomplish it more proficiently. During the second