In regard to the soul, on the other hand, which is left over after the animal and the human bodies have been separated off as belonging inside the closed region of nature: here the exemplary role of physics' conception of nature, and of the scientific method, has the understandable effect this since the time of Hobbes that a type of being is ascribed to the soul which is similar in principle to that of nature; and to psychology is ascribed a progression from description to ultimate theoretical explanation similar to that of biophysics.