People who do well on one kind of mental test tend to do well on other tests, as well. This has led scientists to investigate a quality of the mind that's known as "general intelligence." General intelligence is just one aspect of smarts and savvy, but it is the part that gets assessed by tests like IQ tests. Now, researchers report that they have localized general intelligence to one part of the brain. NPR's Richard Harris reports on this contentious finding.
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