I haven't read all of the comments here, but I come from a pretty good neuroscience background and have some thoughts on why this looks like baloney. It's about the way the brain works. The brain itself is not a sensory organ. It processes signals from sensory organs. Information reaches the eye or the skin or the tongue as mechanical, chemical, and optical data but then get transduced into an electrical impulse. Even if there were light receptors in the brain, it's highly unlikely that they would be so specific that activating them would cause positive feelings. That's how information gets processed at the level of our senses, but not in our brains. Individual neurons do not hold individual memories. Nor do they seem to control specific emotions.<p>If shining light on the brain actually changed the levels of activity, it would have an impact on entire neural circuits, not just on this one process. At least, that's how I see it.