"About 10.6 percent of people are left-handed. It is still not well understood why some people prefer to write, draw, and perform other activities with their left hand, while most people prefer to use their right hand for these things. Recent research about left-handedness has focused on brain differences between left-handers and right-handers. This makes a lot of sense: Left-handedness is not caused by the hands themselves, but by the differences in brain organization-but which?"
"Somewhat surprisingly, not much came out of research focused on the size of different brain areas. For example, a large-scale neuroimaging study found no statistically significant differences in the surface area of different brain regions between left- and right-handers ( Guadalupe and co-workers, 2014). Only when very liberal statistical thresholds were used, a difference was found in the precentral sulcus, a brain area relevant for motor behavior."
About 10.6 percent of people are left-handed. Left-handedness arises from differences in brain organization rather than from the hands themselves. Large-scale analyses of brain region surface area revealed minimal structural differences between left- and right-handers, with only weak effects in motor-related cortex under liberal thresholds. Network-level organization reveals clearer distinctions: functional connectivity patterns differ between left- and right-handers. Connectivity differences are strongest within motor networks and emotion-related networks. These connectivity differences implicate brain network organization, rather than gross regional size, as a likely contributor to handedness.
Read at Psychology Today
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