The model for this work was the description of the physical world by mathemati cal laws. It were always the simplest phenomena which were treated by this scientific method. Physicists studied simple motions inorder to find the mathematical laws. Astronomists observed the orbits of planets in order to find the laws of gravity. One of the simplest measurable phenomenon in the brain is the stimulus response task. Suchtasks have beenknown since the lastcentury bypsychiatrists and psycholo gists (v. Helmholtz). There existsa vast literature about the measurement and theory of simple reaction tasks...