The basis of identical/fraternical twin study conclusions has a fundamental problem:

identical twin pairs grow up experiencing much more similar environments than experienced by same-sex fraternal pairs, meaning that the equal environment assumption — upon which all conclusions in favor of genetics are based — is false.

Therefore, many critics have argued that it is likely that identical-fraternal comparisons capture nothing more than identical pairs more similar treatment, greater environmental similarity, stronger attachment and emotional bond, and greater levels of identity confusion feeling like they are two halves of the same whole ."

Second, spatial abilities are definitely learned; for example, people blind since birth whose vision is surgically corrected have huge problems relating vision to spatial understanding; and anyone can improve their spatial ability by exercises like mentally rotating dice in their head, or contemplating symmetry operations reflection, rotation, inversion, etc.

Studies of identical twins separated at birth seem to argue against that as identical twins raised apart are very likely to have extremely similar behavior.

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