I have here an abstract from a 1999 article in Science Direct looking at the IQ/noggin relationship.
Quote:
Intelligence
Volume 27, Issue 1, February 1999, Pages 83-92
Magnetic resonance imaging brain size/IQ relations in Turkish University students
Üner Tan, , a, Mel ha Tana, Pinar Polatb, Ya ar Ceylanb, Selam Sumab and Adnan Okurb
a Karadeniz Technical University, Trabzon, Turkey
b Ataturk University, Erzurum, Turkey
Abstract
The relation of IQ (Cattell's Culture Fair Intelligence Test) to brain size was studied in 103 right- and left-handed men and women at Atatürk University in eastern Turkey. Cerebral areas were measured on a midsagittal section of the brain using MRI. An overall correlation of 40 was found between MRI-measured total area and IQ thereby further supporting the IQ–brain size hypothesis. Additional analyses suggested that these results may need qualification. In men, only anterior cerebral area correlated with IQ. In women, total and posterior cerebral areas were correlated with IQ. Other results varied by handedness.
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I liked the part near the end:
"Additional analyses suggested that these results may need qualification. In men, only anterior cerebral area correlated with IQ. In women, total and posterior cerebral areas were correlated with IQ. Other results varied by handedness."
So it turns out that to get the correlation
different parts of male and female brains must be measured. But not the whole brain in either case. And IQ varied with handedness?
I'm assuming a typo and that the correlation was really 0.40. And I should note this appears to be a correlation of brain cross-sectional area, not volume.
I'll keep looking for other stuff.