%0 Journal Article %T Design for a Darwinian Brain: Part 1. Philosophy and Neuroscience %A Chrisantha Fernando %J Computer Science %D 2013 %I arXiv %X Physical symbol systems are needed for open-ended cognition. A good way to understand physical symbol systems is by comparison of thought to chemistry. Both have systematicity, productivity and compositionality. The state of the art in cognitive architectures for open-ended cognition is critically assessed. I conclude that a cognitive architecture that evolves symbol structures in the brain is a promising candidate to explain open-ended cognition. Part 2 of the paper presents such a cognitive architecture. %U http://arxiv.org/abs/1303.7200v1