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To do that, we should need a way to suppress our emotional responses, since those are what we routinely use to make decisions.

We don't 'need' much of a brain at all to do most of our living--few people are actually using much of their time thinking.

In fact, it seems to me that the only real purpose a brain serves is to help organisms adapt to changing environments.

In an unchanging environment, a high-powered brain is little help--in fact, it is likely to go unused.