Researchers saw this as a paradoxical response to fingers being immersed in water. The reason fingers wrinkle is because blood flow to the fingers is reduced, causing the bodies that regulate body temperature to lose volume and they pull the skin structure downwards.
However, when they found that a reattached finger didn't act the same way, it made the scientists think that maybe the skin shrinking was not triggered by an inherent property of the skin itself, but rather it's activated by nerves! When a finger is reattached, the nerve endings don't function in the same way anymore, so this suggests that the nervous system triggers the response to wrinkle!
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