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Old 06-30-2000, 12:03 PM
Dumb Ox Dumb Ox is offline
Join Date: Apr 2000
Posts: 202
Phobos, the mental age/chronological age ratio isn't used anymore. Today, IQ scores are purely statistical, based on the normal curve.

I assume "mental age" is asymptotic at "adult"
You assume correctly, for the most part. Scores on performance tasks on IQ tests decline very slowly after age 20 or so, while scores on verbal tasks remain stable and may even increase slightly. Overall, it's a wash. Full-scale scores are stable in adulthood.

Therefore, IQ seems to be more applicable to child prodigies and less applicable to identifying genius in adults.
Hmmm... I guess it depends on how you define "genius." But IQ tests are equally reliable for children and adults, across the entire range of scores.