The genetic basis of human scientific knowledge.

Abstract

The ecologically most significant respect in which humankind now dominates all other terrestrial species is in its scientific understanding and technological manipulation of the world. What psychological adaptation underlies this seemingly discontinuous development? There is reason to believe that natural selection has endowed the perceptual/representational systems not only of humans but also of other perceptually and cognitively advanced animals with an implicit knowledge of pervasive and enduring properties of the world. Perhaps especially in the human species, natural selection has, in addition, favoured a heightened degree of voluntary access to the representational machinery embodying this implicit wisdom, thus facilitating the realistic mental simulation of possible actions in the world before taking the risk of carrying them out physically. This, together with the emergence of an unprecedented motivation toward understanding, seems to have enabled some human individuals to use 'thought experiments' to convert more and more of the implicit knowledge that we all share into a self-consistent set of explicit scientific laws. Although knowledge of the world must ultimately come from the world, as empiricists claim, it can in this way come through one's genes as well as through one's own direct perceptual interactions with the world.