Can Pupil Size Predict IQ?

Could IQ--a famous standard of intelligence that has long eluded quantification--be as easy to measure as pupil size? Could the reason why establish a link between norepinephrine and fluid intelligence (and therefore, Mental Mojo consumption--See last paragraph)? Georgia psychologists Jason Tsukahara and colleagues hypothesize affirmatively in a paper they published two months ago. First a little background. Pupils have long been known to vary in size due to changes in emotional state and cognitive effort (i.e., brain strain). As Tsukahara writes: Starting in…

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Is Your Brain Over the Hill by 30?

Cognitive aging is widely misunderstood. It is true that many cognitive capabilities begin to decline in one's twenties, foremost among them fluid intelligence (the ability to solve novel problems). However, new studies are emphasizing that this is only half of the intelligence equation. The other half--crystallized intelligence--continues to improve all the way into one's seventies. And what's more, new theories are being advanced that fluid intelligence, once thought to be static and genetic, can be amplified through focused…

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