PMID: 11913330Mar 27, 2002Paper

Testosterone and nonverbal intelligence in right-handed men with successful and unsuccessful educational levels

The International Journal of Neuroscience
N KutluU Tan

Abstract

The relationship between serum total testosterone (T) concentration and fluid intelligence (nonverbal, spatial) was studied in consistently right-handed men with successful (S) or unsuccessful educational levels (NS). Hand preference was assessed by the Edinburgh Handedness Inventory. Nonverbal intelligence was measured by Cattell's Culture Fair Intelligence Test. Serum T level was determined using chemiluminescence enzyme-immunoassay on hormone autoanalyzer. There was no significant difference between the mean T levels of the S subjects and NS subjects, although S-men tended to have higher T levels than NS-men. The mean IQ was found to be significantly higher in S-men than NS-men. In the total sample (S + NS men), the correlation between T to IQ was best described by a polynomial regression (3rd order), exhibiting an inverse U-shaped regression. In S-men, the relationship between T and IQ was best described by a polynomial regression equation of the 3rd order; however, the relationship was not U-shaped, but rather a positive correlation (low T: low IQ and high T high IQ). In NS-men, there was an inverse U-shaped correlation between T and IQ (low and very high T: low IQ and moderate T: high IQ). The present data suggest that (i...Continue Reading

References

May 1, 1992·The International Journal of Neuroscience·U Tan, A Akgün
Jan 1, 1991·Psychoneuroendocrinology·C Gouchie, D Kimura
Oct 1, 1990·The International Journal of Neuroscience·U Tan
Jan 1, 1987·Neuropsychobiology·K Christiansen, R Knussmann
May 1, 1986·Annals of Clinical Biochemistry·M J WheelerR D Jennings
Nov 1, 1985·The Journal of Clinical Endocrinology and Metabolism·D C Cumming, S R Wall
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Dec 9, 1998·The International Journal of Neuroscience·U Tan, M Tan
Mar 31, 2000·Brain and Cognition·D F Halpern

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Citations

May 10, 2005·Hormones and Behavior·Aitziber AzurmendiJosé R Sánchez-Martín
Aug 2, 2003·Trends in Endocrinology and Metabolism : TEM·Majon MullerYvonne T van der Schouw
Apr 23, 2003·Perceptual and Motor Skills·Uner TanAhmet Akgun
Oct 30, 2016·Neuroscience and Biobehavioral Reviews·Nanda RommelseStephen V Faraone
Jan 18, 2003·Psychological Reports·Deborah A Yurgelun-ToddAshley D Young

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