The first brains came about in the precambrian or at the border with the cambrian around 560 million years ago when the first multi-celluar organisms emerged. It has always struck me how/why organisms developed brains. The brain must have emerged together with eyesight, since eyesight would be worthless without a brain. I can see how certain multicellular organisms might have evolved certain photo-sensitive cells into eye-sight, but how did they know, and what gave them information(the blueprint) how and why to construct a brain to make use of the eyesight? Did the brain form before the eyesight and the other senses? If so, what purpose would it serve? If it came about at the same time with the other 6 senses, what made it possible? How does the evolution theory address this question?