> Aine wrote:
> > Take walking upright as an example. At what point and by what
> > mechanism did it become automatic and instinctive behavior
> > instead of a "See, look what I can do!" thing?
> I would think not so much instinctive behavior as a purely
> physiological mechanism that allowed selective advantage as
> climate changed and our ancestors moved from living in trees to
> open savannah?
> Pretty soon, everyone was doing it!
> I'm not sure if you've read anything on the controversy over
> bipedalism leading to bigger brains or the other way around?
Yes, and I have my doubts about it being a causal factor at all. IMO it was the introduction of high amounts of fatty acids via cooked meats that led to a bigger brain.
Bipedalism may well be a purely physiological mechanism. But what about language? IMO that's as instinctive as walking upright and may well date back just as long. (I have a really hard time believing no one spoke until 40,000 years ago. To me, the whole idea is ludicrous.)