A study looks at the nature of change in our aging, changing brains

(Medical Xpress) -- As we get older, our cognitive abilities change, improving when we’re younger and declining as we age. Scientists posit a hierarchical structure within which these abilities are organized. There’s the “lowest” level— measured by specific tests, such as story memory or word memory; the second level, which groups various skills involved in a category of cognitive ability, such as memory, perceptual speed, or reasoning; and finally, the “general,” or G, factor, a sort of statistical aggregate of all the thinking abilities.

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