The point made by Spearman was that the tests that loaded onto the g-factor (correlated highly with the factor in a Factor Analysis) did so relative to the degree of mental complexity involved to solve them.
Hence... the most ideal measures of the g-factor appear to be those that require a person to compare, choose, analyze and synthesize, or to infer correctly. Judgment and invention have been touted as synonyms for g-factor.
Ref:
http://nicologic.free.fr/index.php
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