From: Rafal Smigrodzki (rms2g@virginia.edu)
Date: Wed Sep 25 2002 - 10:10:16 MDT
Olga wrote:
> From: "Rafal Smigrodzki" <rms2g@virginia.edu>
>
>> Damien wrote:
>>
>>> All this is fair enough, and I'm sorry if I seemed to be implying
>>> that *your* comments were racist. But this thread is about THE BELL
>>> CURVE.
>>
>> ### But the Bell Curve is not about races. It's about IQ. So why
>> mention race?
>
> Well, now, did The Bell Curve cite studies measuring the IQs of
> pigeon-toed people cf. the IQs of blue-eyed people; or the IQs of
> people under 5'6" cf. to the IQs of people between 5'6" and 6' cf. to
> people who were over 6" tall? No?
### To the best of my knowledge there are no significant IQ differences
between the groups you mentioned. Obviously, a treatise about IQ will not
dwell on issues uncorrelated with IQ.
>
> Did The Bell Curve reveal the IQs of multiparas cf. to the IQs of
> primaparas cf. to the IQs of women who have never given birth to
> children. No?
>
> Or maybe the IQs of left-handed people cf. to the IQs of right-handed
> people? No?
### As far as I know the IQ of left- vs. right-handed subjects is
essentially the same, although there are some minor differences according to
some studies:
Hardyck C. Petrinovich LF. Goldman RD.Left-handedness and cognitive
deficit.,Cortex. 12(3):266-79, 1976 Sep.
Abstract
Intellectual and performance measures were taken on 7688 school children
tested on three behavioral measures of handedness and one measure of
eyedness. Test results were compared against all combinations of handedness
and eyedness and against a measure of socio-economic level. No relationships
of any kind were found. Comparisons of the present results are made against
33 studies concerned with possible deficits associated with left-handedness.
The results of the present study combined with a review of the majority of
studies on deficit and handedness strongly suggest that the hypothesis of no
difference in intellectual and cognitive performance between right- and
left-handed subjects can be accepted as true.
Ounsted M. Cockburn J. Moar VA.Hand preference: its provenance, development,
and associations with intellectual ability at the age of 7.5 years. Journal
of Developmental & Behavioral Pediatrics. 6(2):76-80, 1985 Apr.
Abstract
The development of 199 children was studied at regular intervals from birth
to 7.5 years. On each occasion hand preference was recorded. Their preferred
hand was evident in 89.4% right and 85.7% left-handers by 4 years. Analyses
on 242 children seen at birth and 7.5 years showed no associations between
left-handedness and nine factors representing different aspects of "birth
stress." For 12 of 15 aspects of ability at 7.5 years left-handed children
had slightly higher scores than right-handers. Pathological factors do not
seem to feature in the provenance or consequences of left-handedness in a
normal healthy population.
Since TBC is about issues where IQ is important, like academic, professional
and financial success, it didn't discuss issues currently irrelevant to IQ,
like handedness. Since left-handed persons are no longer persecuted by
teachers, this is a non-issue.
I don't know about multiparas. Why do you ask?
Rafal
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