Brain #1: Purpose and Optimization
For what purpose has the brain evolved? As humans, we are biased when we encounter that question, writes Lisa Barrett in Seven and a Half Lessons About the Brain . We wrongly assume that the purpose of the brain is to think: “After all, thinking is the human superpower, right?” Wrong, says Barrett. Long, long ago, unicellular life found itself in competition with others over limited resources, the importance of any capability to sense what lay where was an evolutionary advantage – Did XYZ lie to the left or right? Gradually though, raw sense organ signals weren’t enough. Choices had to be made – was it likely one could catch the prey? Make a wrong choice repeatedly and one would die of starvation. Thus: “Energy efficiency was a key to survival.” So Barrett concludes: “Your brain’s most important job is to control your body… by predicting energy needs before they arise so you can efficiently make worthwhile movements and survive.” But this created...