In his book How to Create a Mind author Ray Kurzweil makes some claims about spindle neurons that he provides no source for.
Concretely he states that spindle cells:
- Are Involved in handling emotion and moral judgement;
- Are believed to first have occurred in the last common ancestor of chimpanzees and humans;
- Are non-existing in newborns, but appear around the age of four months, and increase significantly in number from ages one to three.
Is there a scientific consensus backing these claims?