I have studied this extensively and have written several hubs on the topic. You are most welcome to take a look - Consciousness, Thoughts and the Brain, Meditation shows thoughts are beyond the brain, and What's with the light bulb above the head. The experiences are tangible, so much so that the origin of thoughts can be felt. Our brain, the physical organ is not the originator of thoughts, but the receptor. Thoughts stimulate the brain and body through our amazingly complex nervous system. The ability to have slowed down thoughts to such an extent as to actually see the mechanism of them has been a phenomenal experience.
There is a lot of context as to what we tap into as far as the 'super highway' of thoughts, too much to place in a small space here. Having the experience of it is mind blowing - literally!