If you focus your attention on specific imagery in your mind and become very present with a sequence of repeated thoughts and feelings, your brain and body will not know the difference between what is occurring in the outer world and what is happening in your inner world. So when you’re fully engaged and focused, the inner world of imagination will appear as an outer-world experience—and your biology will change accordingly. That means you can make your brain and body look as if a physical experience has already happened without having the actual experience.
