American Journal of Neuroradiology 22:1342-1345 (8 2001)
© 2001 American Society of Neuroradiology
ARTICLE
Amygdalar and Hippocampal Volumetry in Control Participants: Differences Regarding Handedness
a From the Division of Neurology (C.A.S., P.F.) and the Research Imaging Center (J.X., J.L.L., L.R., P.F.), University of Texas Health Science Center, San Antonio, TX.
BACKGROUND AND PURPOSE: Amygdalar and hippocampal volume measurements indicate a right-greater-than-left asymmetry for right-handed normal participants in most studies. The purpose of this study was to compare amygdalar and hippocampal volume ratios between right- and left-handed participants.
METHODS: Amygdalar and hippocampal volume measurements were performed in 34 (20 right-handed and 14 left-handed) normal participants. All participants completed a 10-item handedness questionnaire. The MR imaging sequence was a 3D T1-weighted gradient-echo acquisition of the whole brain (24/6 [TR/TE]; flip angle, 25 degrees). MR images were spatially normalized, and volumes were painted with a 1.0-mm3 resolution cursor on an SGI workstation.
RESULTS: In right-handed participants, the amygdala and hippocampus (P < .001 for both) were significantly larger on the right side than on the left. The left-handed group did not show a significant difference between right- and left-sided structures. Right-to-left volume ratios differed significantly between right- and left-handed participants for both amygdalar (P < .02) and hippocampal (P < .01) structures. Gender did not affect right-to-left amygdalar and hippocampal volume ratios in right- or left-handed participants.
CONCLUSION: Handedness, but not gender, seems to affect right-to-left amygdalar and hippocampal volume ratios.
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