Dtff Vol. 19. No.
I. pp. 113-l 15. I995
Copyright P 1995 Elsrwer Scmcr
Pnnted I” Cirear Bmam. All rights re\emed
0 I9 I -8X69/95 S9 50 - 0.N
Brain size and intelligence:
John C. Wickett’
and Philip A. Vernon’
/Clinic01 Section). Unir~ersi~ of Leicester.
LEI 7RH. England
Uni\~ersit~ of Western Ontario.
Canada N6A SC-1
published results (Egan. Chiswick.
Br Best. Persona/it?
1994). and suggests that the
between total brain volume and Full-Scale
for height and weight.
is 0.18 not 0.66. This result replicates correlations
of similar sizes found by researchers
from four different
research teams. The high correlation
between CSF volume and IQ measures
in this study
to the method of estimating CSF volume.
It is suggested
that an automated method may have
provided an indirect measure of brain surface area. Finally.
by simulatin, 0 the range of possible partial
brain volume and intelligence
for height and weight,
it is argued that the
betvvecn brain volume and measures of IQ is only modestly affected by correction
for body size.
As such, brain volume/IQ
should only be corrected
for body size if data from the specific study
warrants such a procedure.
A number of recent studies have reported significant
between brain volume (as measured
resonance imaging) and measures of intelligence
[as measured by standard psychometric
Schultz, Rutledge & Biplrr.
1991: Andreascn. Flaum, Swayze
Aliger. Cohen, Erhardt & Yuh, 1993; Raz. To