Matt: Is this an OK entry?
Humanity? Maybe It's in the Wiring By SANDRA BLAKESLEE
Published: December 9, 2003
...There are specialized neurons at work, as well — large, cigar-shaped cells called spindle cells...

...Spindle cells are not present at birth. They appear around age 4 months and gradually increase during the second and third year of life, the same time that guilt and embarrassment appear.

...The only other animals known to have such cells are the great apes. These neurons are exceptionally rich in filaments. And they appear to broadcast socially relevant signals all over the brain.