The fact is, life’s successes and failures are sporadic, and their causes are difficult to determine. Hard work and luck are behind most successes, t… - Michael S. Gazzaniga

Just before I left for Long Island and my new life, I got another call, this one from Dr. Ernest Sachs, up at Dartmouth Medical School. He was head of neurology at the time, and he invited me up to give a lecture. I was thrilled. I was to play the role of professor at my old alma mater! It was especially sweet because the very same medical school had rejected my application eleven years earlier, even though I was an undergraduate at Dartmouth and my brother was one of their stellar graduates. It is events like this in one’s past that fall off the story line. What if I had been accepted and gone? There would have been no split-brain work for me. How would that whole story have been different? I believe that things just happen in life, and pretty much after the fact, we make up a story to make it all seem rational. We all like simple stories that suggest a causal chain to life’s events. Yet randomness is ever present.

Research has shown that 150–200 people are the number of people that can be controlled without an organizational hierarchy.23 It is the number of people one can keep track of, maintain a stable social relationship with, and would be willing to help with a favor.

While there are more neural connections within a half brain than between the two halves, there are still massive connections across the hemispheres. Even so, cutting those connections does little to one’s sense of conscious experience. That is to say, the left hemisphere keeps on talking and thinking as if nothing had happened even though it no longer has access to half of the human cortex. More important, disconnecting the two half brains instantly creates a second, also independent conscious system. The right brain now purrs along carefree from the left, with its own capacities, desires, goals, insights, and feelings. One network, split into two, becomes two conscious systems. How could one possibly think that consciousness arises from a particular specific network? We need a new idea to cope with this fact.