Neuroscience of afterlife
Now we know that rather than merely reacting to the external world, the brain spends much of its time and energy actively making predictions about the future—mostly the next few moments. Will that baseball flying through the air hit my head? Am I likely to become hungry soon? Is that approaching stranger a friend or a foe? These predictions are deeply rooted, automatic, and subconscious. They can’t be turned off through mere force of will.
And because our brains are organized to predict the near future, it presupposes that there will, in fact, be a near future. In this way, our brains are hardwired to prevent us from imagining the totality of death.
If I am allowed to speculate—and I hold that a dying person should be given such dispensation—I would contend that this basic cognitive limitation is not reserved for those of us who are preparing for imminent death, but rather is a widespread glitch that has profound implications for the cross-cultural practice of religious thought. Nearly every religion has the concept of an afterlife (or its cognitive cousin, reincarnation). Why are afterlife/reincarnation stories found all over the world? For the same reason we can’t truly imagine our own deaths: because our brains are built on the faulty premise that there will always be that next moment to predict. We cannot help but imagine that our own consciousness endures.