What similarities could I expect to find across alien nervous systems?

In the book The Host by Stephenie Meyer, a parasitic species (Souls) attach to the back of the spinal cord of alien creatures to control their brains, but I find this a wee bit unbelievable. As it is unlikely that a wide range of aliens would have a spinal cord, what feature of the nervous system is likely to be found across a wide variety of alien species?

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What similarities could I expect to find across alien nervous systems?

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