Cerebral torque is human specific and unrelated to brain size.

Both the frontal and occipital petalia (see Table 2 ) were highly significant in humans [ t (90) = − 4.94, p < 0.0005 and t (90) = − 7.69, p < 0.0005, respectively], whereas no significant asymmetry was found in either petalia in chimpanzees.

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