Professor Michael Arbib defends the metaphysical position of naturalism on the basis of recent and projected work in cognitive science. Naturalism, he says, is the view that there is only spatiotemporal reality. He means to counterpose this position to the claim that phenomena of personhood, such as mind, will or soul, transcend space-time. Arbib proposes schema theory and the work of cognitive science as ways of showing how naturalism can accommodate such phenomena.