In my alternative universe a race called "Reflections" are the counterpart of humans. They are a reflection, hence the name, of actual humans on earth. Each human has a reflection in this alternate world. Essentially each human's reflection is somewhat similar to their guardian angel. It kind of keeps an eye out for them. Their brains are connected somehow, so that they are basically there the same person with the same personality etc. When the human dies, the reflection dies as well. I am trying to figure out how to link them through the brain. Is there like a certain aspect  or physical part of the mind or brain that could potentially be linked to another life in an alternative universe?