http:/www.ssc.uwo.ca/psychology/faculty/rushtonpdfs/SizeMatters.pdf
Wat wil je met deze link aantonen of weerleggen, Je theorietje wordt niet bevestigd door deze tekst; Lees de "abstract" goed he kerel.
We provide a case by case examination of Kamin and Omari's critical review (South African Journal
of Psychology, 1998, 28, 119±128) concluding that race dierences in head size were too small to explain
their dierences in IQ. Although Kamin and Omari make several valid points and identi®ed an
``anomalous'' ®nding in two samples (that Blacks averaged greater head circumference than Whites), in
the main their review is highly misleading. We ®nd, among other things, that Kamin and Omari: (1)
ignored the relation between brain size and IQ established by magnetic resonance imaging and the race
dierences in brain size established by MRI, autopsies, and endocranial volume; (2) erred in attributing
to arithmetic errors and uncontrolled dierences in coïtus ratio the dierences in head size found from
birth to age seven in the National Collaborative Perinatal Project; (3) neglected data showing that
young Black girls mature faster than White girls which explains why Black girls sometimes average
cranial sizes equal to or greater than their White age peers; and (4) seized upon ad hoc ``alternative''
®ndings and explanations for particular studies. When the principle of aggregation is employed and data
averaged across the numerous studies, the race dierences in average cranial capacity clearly emerge.
New analyses in this article also con®rm that whereas Blacks average proportionately longer heads,
Whites and Asians average proportionately wider and higher heads, which explains why dierent
equations for estimating cranial volume sometimes produce dierent results. We conclude that brain
volume bears a strong relation to cognitive ability, and that increasing encephalization over evolutionary
time led to progressively more spherically shaped heads with corresponding increases in head width and
head height.
Waar lees jij dat Afrikanen kleinere hersenen hebben? Ik lees wel iets over de schedelgrootte maar niks over de hersengrootte en ik lees alleen maar dat er een relatie bestaat tussen"a strong relation to cognitive ability, and that increasing encephalization over evolutionary
time"