Ok, thanks for the explanation.

Full disclosure, I have a doctorate in psychology (but have been out of the field almost a decade now), so am well aware of the "actual" psychological research.

Personally, for my money, IQ lead to the development of most of modern psychometrics, which I think is probably psychology's largest contribution to intellectual knowledge, but that's probably my quant bias showing.

Sure, behaviourism has had a bunch of successes, but it's only necessary for psychology, and definitely not sufficient.

Classical conditioning I'll give you, but I definitely didn't hear much about either instinctual drift or childhood amnesia relative to IQ.

> theory of perception, Which one? are you talking about the information processing model or the gestalt models? I'd probably agree with you on Gestalt, but not on IP (which I think is the steam-engine metaphor of the mind of our time).

I'd agree that it's not the most essential question, but it's definitely one of the most studied.