posted on Nov, 1 2004 @ 10:38 PM
About the 10-15% of the brain....
First, I don't really buy that all that tissue is there and we don't use it at all. Couldn't it just be that we don't know about it's function
yet? There are still a lot of things we don't have worked out up there. Maybe we just don't know that we use it.
But considering the scientists who told us we only use 10-15% of out brains are probably a heck of a lot smarter than me, here's my best guess at an
Things (organisms, organs, etc.) change and evolve over the course of a LONG evolutionary history. And the selective pressure causing these things to
evolve also changes. The environment we live in now is not the same as the one our brains evolved in. Perhaps we used that extra tissue at some
point, and we just don't use it anymore.
It's kind like why we still have wisdom teeth, appendixes, and why whales have hipbones (vestigial structures). We needed them, then.
Why haven't we evolved to get rid of the excess tissue? We probably are. If I remember correctly, homosapien brains are tending to get smaller,
with more neural connections (essentially more efficient). But we're probably not in much of a hurry... after all, other than maybe some excess
weight, it's not hurting us. Having some extra brain you're not using doesn't prevent you from having fertile children... it doesn't affect