What you would come up with is that the regression
line is up here and this distance actually is 121 percent
less than would be expected, so the predicted volume
is 121 percent more, if I could put it that way.
I would suggest that when your predictions are off
by more than 100 percent, it's time to think about it
and look at it carefully. I think that's a very important
argument for the reduction, speaking relatively
and allometrically, of primary visual striate cortex in
humans. I would translate that, then, into a relative
increase of posterior parietal association cortex -
that is, through time.
We didn't evolve from chimpanzees, so please keep
that in mind , we always play the game of using the
chimpanzee as our stem ancestor. Be careful in
that kind of reasoning.