Continuity and Change
Neuroscientist: Is the self really "indivisible"? We have "split-brain" patients where the two halves of the brain can actually want different things. One hand might choose a red shirt while the other chooses blue. The "Self" seems to be a narrative—a story the brain tells itself to make sense of its various parts. It’s a useful fiction, not a permanent substance.
Avicenna: A story requires a reader! If the self is a narrative, who is reading the narrative? You speak of parts, but when you say "I am hungry," you do not mean your stomach is hungry or your brain is hungry—you mean you are. This unity of experience (wahda) cannot be found in the physical world, where everything is in a state of flux. Your body replaces every cell over seven years, yet you remain the same "I" that you were as a child. What carries that identity across the years if not the Soul?
Neuroscientist: Information carries it. Like a flame moving from one candle to another, the matter changes, but the pattern remains. Memory is the glue. If I could perfectly duplicate the connections in your brain into a machine, that machine would have your "identity." It would remember your childhood and feel your loves. There is no need for a "substance" when the data is sufficient.
Avicenna: If I copy your book onto two scrolls, are there now two of you? No, there are two copies of a record. The Soul is not a record of the past; it is the living presence of the now. The "I" is the Necessary Existent within the human frame. You offer a mirror that records reflections; I am speaking of the light that allows the mirror to see.