Because altruism is positively correlated with IQ, it was predictable that 150 IQ Ganzir was generous enough to order an article for $3.50. The topic he ordered was “spatial IQ deficits (relative to overall IQ) in people of normal or higher IQ”. but rather than writing one long article on such a heterogenous topic, I thought I would do a series of relatively brief articles. In this first part we will explore Turner’s Syndrome.
Turner syndrome (TS), also known 45,X, or 45,X0, is a genetic condition in which a female is partly or completely missing an X chromosome. Signs and symptoms vary among those affected. Often, a short and webbed neck, low-set ears, low hairline at the back of the neck, short stature, and swollen hands and feet are seen at birth. Typically, they develop menstrual periods and breasts only with hormone treatment, and are unable to have children without reproductive technology.Heart defects, diabetes, and low thyroid hormone occur more frequently. Most people with TS have normal intelligence, however many have troubles with spatial visualization that may be needed for mathematics. Vision and hearing problems occur more often.
Arthur Jensen stated:
Provided no spatial visualization tests are included in the IQ battery, the IQs of these women (and presumably their level of g) are normally distributed and virtually indistinguishable from that of the general population. Yet their performance on all tests that are highly loaded on the spatial-visualization factor is extremely low, typically borderline retarded, even in Turner’s syndrome women with verbal IQs above 130. It is as if their level of g is almost totally unreflected in their level of performance on spatial tasks.
If the typical Turner syndrome woman’s (verbal) IQ is normal (IQ 100 in the U.S.) but her spatial IQ is borderline (IQ 75), that’s a 25 point gap. Thus one might expect Turner syndrome women with (verbal) IQs of 130+ to have spatial IQs of 105+, but apparently their spatial IQs are about 75 too. This suggests a near-zero correlation between verbal and spatial among Turner syndrome women (which make wonder if g even exists in these women) or their distribution of spatial IQ is extremely narrow. Unfortunately Jensen didn’t cite his source.