Has Human Evolution Stopped? Friday, November 2nd, 2007

Our Ancestral Mind in the Modern World: An Interview with Satoshi Kanazawa introduces some interesting ideas about why we do the things we do.

In fact, we’re not playing catch up; we’re stuck. For any evolutionary change to take place, the environment has to remain more or less constant for many generations, so that evolution can select the traits that are adaptive and eliminate those that are not. When the environment undergoes rapid change within the space of a generation or two, as it has been for the last couple of millennia, if not more, then evolution can’t happen because nature can’t determine which traits to select and which to eliminate. So they remain at a standstill. Our brain (and the rest of our body) are essentially frozen in time — stuck in the Stone Age.

One example of this is that when we watch a scary movie, we get scared, and when we watch porn we get turned on. We cry when someone dies in a movie. Our brain cannot tell the difference between what’s simulated and what’s real, because this distinction didn’t exist in the Stone Age.