ABSTRACT
This chapter discusses the most pressing empirical constraint. It is not even certain that the brain functions as a neural network, in the sense used in theoretical work, as there is no evidence for some features that are essential to most current networks. The chapter is concerned with the possibility of implementing the theory in the brain: its compatibility with what we know about neurons. It considers the ways in which such a capacity might have arisen. The chapter also discusses three different sets of empirical evidence, all of which seem to support the broad outlines. It assumes that modern biology is roughly correct about the origin of human beings: that we arose by neo-Darwinian evolution. If this assumption proves to be false, then the argument in the chapter will likely be worthless: however, given the strength of support for Darwinian Theory,.
