The introduction to this article provides insufficient context for those unfamiliar with the subject. Please help improve the article with a good introductory style. (October 2009)

Brain asymmetry can refer to at least two quite distinct findings:

• Neuroanatomical differences between the left and right sides of the brain
• Lateralized functional differences: Lateralization of brain function

Neuroanatomical differences themselves exist on different scales, from neuronal densities, to the size of regions such as the planum temporale, to—at the largest scale—the torsion or "wind" in the human brain, reflected shape of the skull, which reflects a backward (posterior) protrusion of the left occipital bone and a forward (anterior) protrusion of the right frontal bone.^[1]

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• Arthur W. Toga & Paul M. Thompson (January 2003). "Mapping Brain Asymmetry". Nature Reviews Neuroscience 4: 37–48. doi:10.1038/nrn1009. http://www.cogsci.bme.hu/DoCS/oktatas/kurzusok/olvasoszeminarium/2003/brainasymmetry.pdf. 
• Marko Wilke and Vincent J. Schmithorst (2006). "A combined bootstrap/histogram analysis approach for computing a lateralization index from neuroimaging data". NeuroImage 33 (2): 522–530. doi:10.1016/j.neuroimage.2006.07.010. PMID 16938470.