Generalisation, in psychology, is the tendency for the learned behaviour from one stimulus to be applied to another, similar, stimulus. Steve Grand wrote, in I Am Ron's Brain, (1995) that an effect like generalisation could be created in creatures' brains by having concept neurones that are similar (being high up and being near a cliff edge, for example), being located near each other in the brain. When one is excited, it broadcasts a signal to nearby concept neurones, and if a good reaction has been learned in the situations represented by the stimulated concept neurones, a norn may lend more weight to the idea of employing the previously learned reaction.