Man at the first subsistence level (A-N), the automatic state of physiological existence, seeks only the immediate satisfaction of his basic physiological needs. He has only an imperative need-based concept of time and space and no concept of cause or effect. His awareness excludes self and is limited to the presence of physiologically determined tension when it is present, and the relief of such tension when it takes place. He lives a purely physiological existence. Man the species, or man the individual, does not have to rise above this level to continue the survival of the species. He can continue the survival of the species. He can continue the survival of the species through the purely physiological aspect of the process of procreation. He can live what is for him, at the A-N level, a productive lifetime, productive in the sense that his built-in response mechanisms are able to reduce the tensions of the imperative physiological needs and a reproductive lifetime. But this level of existence seldom is seen in the modern world except in pathological cases.