Abstract

Why do we have a brain? After all, it's a good deal of trouble. A brain is very expensive; a hefty percentage of our cardiac output goes towards its nourishment. A brain is fragile. If you cut off its groceries for even a few minutes, it's gone, taking the rest of us with it. Worst of all, it is highly likely that pain, fear, sadness and other undesirable states require a brain. None of these things are issues for our brainless relatives, such as lichens or pond scum. On the other hand, a brain comes in handy sometimes. Its very useful at tax time. I find it particularly helpful when watching "Jeopardy" or when taking board examinations. But those are just special cases; in general, why bother with a brain? 2012 APA, all rights reserved)