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Sex differences in the relationship between white matter microstructure and impulsivity in adolescents.

Abstract：

:Rapid maturational brain changes occur during adolescence--a time associated with risk-taking behaviors and improvements in cognition. The present study examined the relationship between white matter (WM) microstructure, impulsive behavior and response inhibition in female and male adolescents. Twenty-one healthy adolescents underwent diffusion tensor imaging using a 3.0-T magnetic resonance imaging system. Impulse control was assessed using the Bar-On Emotional Quotient Inventory, Youth Version. Response inhibition was assessed using the Stroop Color-Word Interference Test. Fractional anisotropy (FA), a measure of WM coherence, and trace, a measure of overall diffusivity, were determined from voxels manually placed in the midline and in the left and right forward-projecting arms of the genu and the splenium of the corpus callosum. Sex-specific differences were observed for the relationship between FA and impulsive behavior in the right anterior callosum for males and in the splenium for females. Males, compared to females, displayed significantly higher FA in the left WM region. Although trace was not associated with impulse control, trace in the genu (for females) and splenium (males and females) was associated with Stroop performance. Regional differences in trace also were evident, with lower values in the splenium observed than in all other regions. Although the latter significantly improved with age, no sex differences in impulse control or in Stroop performance were detected. The present findings provide supporting evidence for sex-related differences in the development of WM microstructure during adolescence. These data further suggest a neurobiological mechanism underlying some of the emotional and cognitive changes commonly observed in males versus females during the adolescent period.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Silveri MM,Rohan ML,Pimentel PJ,Gruber SA,Rosso IM,Yurgelun-Todd DA

doi

10.1016/j.mri.2006.03.012

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

833-41

issue

7

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(06)00150-0

journal_volume

24

pub_type

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