There’s something fundamental about consciousness that is impossible to share with others. When we label certain frequencies of light “green” or “red,” we have no way of telling whether my qualia—my experience of green and red—are the same as yours. Maybe I experience green the same way that you experience red, and vice versa. Yet there’s no means for us to directly compare our qualia using language or any other method of communication.[10] In fact, even when it does become possible to directly connect two brains together, it will be impossible to prove whether the same neural signals trigger
...more
