Serotonin can act as a growth factor for the stem cells in the fetal human brain that determine brain size. During human evolution, the size of the brain increased, especially in a particular part ...

What makes us human? According to neurobiologists it is our neocortex. This outer layer of the brain is rich in neurons and lets us do abstract thinking, create art, and speak complex languages. An ...

The neocortex stands out as a stunning achievement of biological evolution. All mammals have this swath of tissue covering their brain, and the six layers of densely packed neurons within it handle ...