IQ Isn’t as Fixed as Once Believed, Research Suggests

Robert Lee Hotz:

A teenager’s IQ can rise or fall as many as 20 points in just a few years, a brain-scanning team found in a study published Wednesday that suggests the intelligence measure isn’t as fixed as once thought.
The researchers also found that shifts in IQ scores corresponded to small physical changes in brain areas related to intellectual skills, though they weren’t able to show a clear cause and effect.