>>13070062Jensen's formulation is pretty much the same, but a little easier to read.
https://philipperushton.net/wp-content/uploads/2015/02/iq-race-spearmans-hypothesis-eysenck-cattell-rushton-jensen-behavioral-brain-sciences-19851.pdfIn more modern terminology, I think many authors now also speak of a "positive manifold", by which they mean that cognitive tasks tend to correlate with each other - so if you are better at a cognitively demanding tasks than someone else, chances are you are also better than that person on most g-loaded tasks. That is what they mean by "positive manifold".
What we increasingly see is that, the more a task is loaded on g, the more it correlates with your IQ. That is even true for non-intuitive tasks, at times, such as color discrimination, as evidenced by the r-value found from evaluations from the Munsell Farnsworth color discrimination test.