[t0mpr1c3]

I question the coherence of this notion of intelligence as continuum of domain-general ability.

Specific measures of ability tend to cluster at the low end more than they do at the high end. This explains both the correlations among abilities, and the fact that high abilities tend to be domain-specific.

An IQ score over 70 has a clinical meaning: it defines the absence of mental retardation. Scores of 90 and 160 are equivalent for this purpose.

"Giftedness" in a domain-general sense is an abstract concept that may or may not map onto something real. The validity of IQ testing derives from measuring the other end of the scale.