http://io9.com/58659...far-as-they-can
Humans evolving into hyper-intelligent beings is a powerful idea in science fiction, but that's probably where the idea will have to stay. Our brains have reached an evolutionary "sweet spot", and we can't get much smarter without making major trade-offs.
That's the finding of psychologists Thomas Hills of the University of Warwick and Ralph Hertwig of the University of Basel. They have examined a number of studies, and they have come to one inescapable conclusion: there's a steep price to pay for enhanced brainpower, and it's almost certainly not a good deal from an evolutionary perspective.
They point to how groups of people with enhanced cognitive abilities - including "savants, people with photographic memories, and even genetically segregated populations of individuals with above average IQ" - and these groups generally suffer from much higher rates of cognitive disorders like autism, extreme synesthesia, and other neural disorders. The researchers also point to attention-focusing drugs like Ritalin, which can really help people with ADD but can actually decrease performance when taken by people with normal attention spans.
Dr. Hillis explains their conclusions:
"These kinds of studies suggest there is an upper limit to how much people can or should improve their mental functions like attention, memory or intelligence. Take a complex task like driving, where the mind needs to be dynamically focused, attending to the right things such as the road ahead and other road users — which are changing all the time. If you enhance your ability to focus too much, and end up over-focusing on specific details, like the driver trying to hide in your blind spot, then you may fail to see another driver suddenly veering into your lane from the other direction.
"Or if you drink coffee to make yourself more alert, the trade-off is that it is likely to increase your anxiety levels and lose your fine motor control. There are always trade-offs. In other words, there is a 'sweet spot' in terms of enhancing our mental abilities — if you go beyond that spot — just like in the fairy-tales — you have to pay the price."
Personally; I think they're wrong and that, biologically, humans can still evolve faster, more efficient, more intelligent brains. And even if we don't, we can probably do it artificially some day anyway. But I don't believe in this whole "evolutionary sweet spot" idea. If we were to employ something unethical like eugenics, combined with a better political system which allowed people to eat nutritional foods as needed daily, sleep well, and get proper exercise and live in a stress free environment, I think that over time we would evolve better brains.
Where as right now people are often forced to go to work or school with as little as 3- 4 hours sleep (I know I have), even no sleep. Skip breakfast, lunch and/or dinner on a frequent basis, as well as the added stress of every day life brought on by things like not having money to pay bills and other expenses.
There are environmental factors that contributed to our increase in intelligence thousands of years ago, and I think there are environmental factors today that are contributing to our lack of intelligence today. Man started cooking his food, man started growing his food.
These two things alone had a tremendous affect on the evolution of our brains, imagine what would be possible if we could make our lives easier still, in the same way we did when we began farming our food.
Edited by Verne, 09 December 2011 - 07:48 AM.