They aren’t really born with two heads, it’s rather twins fused together and born with one body. That said the extent of the balancing of functions between the brains truly depends on how they are fused together and the extent of the malformation.
Generally speaking, in humans, in the vast majority of scenarios, each brain has separate thoughts and is responsable, feels and coordinates one side of the body with very little overlap.
Neural activity has only been observed to be shared, if the skulls are connected
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