<i>> when the researchers passed a mild current through the electrodes, stimulating a small region at the intersection of the temporal and parietal lobes of her brain, she experienced what she described as a shadowy presence lurking nearby, mimicking her own posture.</i><p>Those kind of things feel very existentialist to me. This shows that human perception, sentience, and consciousness are deeply and essentially tied to our biology, and that we're all a few micrograms of chemicals or electrical impulses in the wrong part of our brain from complete schizophrenia.<p>This seems like a very strong argument against any kind of transhumanist rhetoric, and that no matter how much our understanding of the universe and manipulation of the physical word progress, the very concept of being human is forever tied to our physical body.