Faculty Collaboration Database

Uncoupled leftward asymmetries for planum morphology and functional language processing. Brain Lang 2006 Jul;98(1):102-11

Date

05/16/2006

Pubmed ID

16697453

Pubmed Central ID

PMC1661833

DOI

10.1016/j.bandl.2006.04.002

Scopus ID

2-s2.0-33646848060 (requires institutional sign-in at Scopus site)   44 Citations

Abstract

Explanations for left hemisphere language laterality have often focused on hemispheric structural asymmetry of the planum temporale. We examined the association between an index of language laterality and brain morphology in 99 normal adults whose degree of laterality was established using a functional MRI single-word comprehension task. The index of language laterality was derived from the difference in volume of activation between the left and right hemispheres. Planum temporale and brain volume measures were made using structural MRI scans, blind to the functional data. Although both planum temporale asymmetry (t(1,99) = 6.86, p < .001) and language laterality (t(1,99) = 15.26, p < .001) were significantly left hemisphere biased, there was not a significant association between these variables (r(99) = .01,ns). Brain volume, a control variable for the planum temporale analyses, was related to language laterality in a multiple regression (beta = -.30, t = -2.25, p < .05). Individuals with small brains were more likely to demonstrate strong left hemisphere language laterality. These results suggest that language laterality is a multidimensional construct with complex neurological origins.

Author List

Eckert MA, Leonard CM, Possing ET, Binder JR

Author

Jeffrey R. Binder MD Professor in the Neurology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adolescent
Adult
Brain
Brain Mapping
Dominance, Cerebral
Female
Functional Laterality
Humans
Language
Magnetic Resonance Imaging
Male
Surveys and Questionnaires
Temporal Lobe