g

g

g

The mutualism model, an alternative for the-factor model of intelligence, implies a formative measurement model in which “” is an index variable without a causal role. If this model is accurate, the search for a genetic of brain instantiation of “” is deemed useless. This also implies that the (weighted) sum score of items of an intelligence test is just what it is: a weighted sum score. Preference for one index above the other is a pragmatic issue that rests mainly on predictive value. View Full-Text