When I first saw the post on Slashdot, it reminded me of when Ice, our cat, passed away nearly three years ago. For several days after his passing, I hallucinated his presence. I have never thought it was anything else than my perceptual apparatus interpreting various stimuli as “Ice”. (Newsflash: I do not believe in actual ghosts.) Coincidentally, the Scientific American article begins by recounting how Carlos Sluzki’s has hallucinated the presence of his deceased cat.