Immortal Humans Will Either Run Out Of Memory or Mentally Reincarnate

Imagine the human brain as a computer. (This is a somewhat controversial metaphor within neuroscience, though a serviceable analogy in the context of this argument.) Now, imagine that the human machine ran, immunized against death by hyper advanced medicine, forever. How long would it take to run out of space to store new ideas and new memories? To answer the question pithily: Longer than you’d think, but eventually. To answer the question less pithily: It’s complicated. ScarJo action vehicles aside, it’s a fiction that we’re not using all of our brainpower at any given moment. Our brains are made up of about a billion neurons, but as Northwestern University psychologist Paul Reber points out at Scientific American, each of those neurons takes on a fairly heavy workload — rather than…


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