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Previous Article | Next Article
The Journal of Neuroscience, May 15, 1999, 19(10):4065-4072
Sex Differences in Brain Gray and White Matter in Healthy Young Adults: Correlations with Cognitive Performance
Ruben C. Gur1, Bruce I. Turetsky1, Mie Matsui1, Michelle Yan1, Warren Bilker1, 2, Paul Hughett1, and Raquel E. Gur1 1 Section of Neuropsychiatry,
Department of Psychiatry, and 2 Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Sex-related differences in behavior are extensive, but their neuroanatomic substrate is unclear. Indirect perfusion data have suggested a higher percentage of gray matter (GM) in left hemisphere cortex and in women, but differences in volumes of the major cranial compartments have not been examined for the entire brain in association with cognitive performance. We used volumetric segmentation of dual echo (proton density and T2-weighted) magnetic resonance imaging (MRI) scans in healthy volunteers (40 men, 40 women) age 18-45. Supertentorial volume was segmented into GM, white matter (WM), and CSF. We confirmed that women have a higher percentage of GM, whereas men have a higher percentage of WM and of CSF. These differences sustained a correction for total intracranial volume. In men the slope of the relation between cranial volume and GM paralleled that for WM, whereas in women the increase in WM as a function of cranial volume was at a lower rate. In men the percentage of GM was higher in the left hemisphere, the percentage of WM was symmetric, and the percentage of CSF was higher in the right. Women showed no asymmetries. Both GM and WM volumes correlated moderately with global, verbal, and spatial performance across groups. However, the regression of cognitive performance and WM volume was significantly steeper in women. Because GM consists of the somatodendritic tissue of neurons whereas WM comprises myelinated connecting axons, the higher percentage of GM makes more tissue available for computation relative to transfer across distant regions. This could compensate for smaller intracranial space in women. Sex difference in the percentage and asymmetry of the principal cranial tissue volumes may contribute to differences in cognitive functioning.
Key words: sex differences; neuropsychology; brain volume; magnetic resonance imaging; gray matter; white matter; cerebrospinal fluid; cognitive performance; segmentation; neuroanatomy
Copyright © 1999 Society for Neuroscience 0270-6474/99/19104065-08$05.00/0
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