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Testosterone and Nonverbal Intelligence in Right-Handed Men With Successful and Unsuccessful Educational Levels
| Content Provider | Scilit |
|---|---|
| Author | Kutlu, Necip Ekerbicer, Nuran Ari, Zeki Uyanik, Bekir Sami Zeren, Taner Tan, Uner |
| Copyright Year | 2001 |
| Description | Journal: International Journal of Neuroscience 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 Cartell's Culture Fair Intelligence Test. Serum T level was determined using chemiluminescence en-zvme-immunoassav 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 $(3^{rd}$ 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 $3^{rd}$ 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) very low and very high serum T concentrations may be disadvantageous, (ii) moderate T levels may be advantageous for general fluid intelligence, and (iii) a prewired cerebral organization may be essential for the T effects on cognitive abilities. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.3109/00207450108986548 |
| Ending Page | 9 |
| Page Count | 9 |
| Starting Page | 1 |
| ISSN | 00207454 |
| e-ISSN | 15435245 |
| DOI | 10.3109/00207450108986548 |
| Journal | International Journal of Neuroscience |
| Issue Number | 1-2 |
| Volume Number | 111 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2001-01-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: International Journal of Neuroscience Endocrinology and Metabolism Intelligence Testosterone |
| Content Type | Text |
| Subject | Neuroscience Medicine |
