P. T. SAUNDERS, An Introduction to Catastrophe Theory, Cambridge University Press, 1980

THE RESPONSE OF A DOG TO RAGE AND FEAR

We can now sketch Fig. 6.2 and see what it suggests about the dog's behaviour. We notice first that the picture reproduces the features we mentioned above: the clear effect of an increase of either rage or fear alone (paths 1 and 2) and the ambiguous effect of a simultaneous increase in both paths (paths 3 and 4). We also discover the two other phenomena typical of the cusp catastrophe: sudden jumps and hysteresis.