Spindle cells are not present at birth. They appear around age four months and gradually increase during the second and third year of life, the same time that guilt and embarrassment appear. As children develop a sense of moral judgment, the frontal lobes and spindle cell system continue to expand.
No neuroscientist would make a leap to say that this is where the conscience or sense of free will is lodged. But if one imagined a single location for these fundamental aspects of human nature, this would be the place.
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