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Significance It is commonly assumed that cognitive functions are asymmetrically distributed across the brain according to a stereotypical pattern, with some dominant in the left hemisphere and others dominant in the right hemisphere. While presumed to present a biological optimum, this pattern is based predominantly on studies investigating only one function. We provide insight into human brain variability by determining hemisphere dominance for five functions within the same individuals. First, while typical organization is generally maintained, it is subject to more variation than is often assumed. Second, human brain organization can be completely mirrored. Finally, the finding of poorer cognitive performance in participants who strongly deviate from typical organization or its complete reversal agrees with its postulated selective advantage.

Mirrored brain organization: Statistical anomaly or reversal of hemispheric functional segregation bias?