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Die moderne Naturwissenschaft zeigt eindrucksvoll die große Reichweite des menschlichen Denkens - sie wirft aber auch die Frage nach ihrer menschengerechten Anwendung auf und führt an unüberwindliche Grenzen jeder Erkenntnis. Tragweite und Grenzen der Wissenschaft verweisen uns zurück auf uralte Fragen der Philosophie, zum Beispiel auf die Suche altgriechischer Denker nach den Urprinzipien der Natur oder auf das „Wissen vom Nichtwissen“ des Nikolaus von Kues. Der Blick auf 2500 Jahre Geschichte des Denkens über die Natur soll dabei helfen, die moderne Naturwissenschaft wieder in die großen Sinn- und Wertzusammenhänge menschlichen Lebens zu stellen.
Modern brain research related to consciousness has resulted in many interesting in- sights, for example into the neurobiological basis of attention and of language. In biological terms, human consciousness appears as a system’s feature of our brain, with neural processes strictly following the laws of physics. This does not necessarily imply, however, that there can be a general and comprehensive scientific theory of consciousness. Predictions of the extent to which such a theory may become possi- ble vary widely in the scientific community. There are reasons - not only practical but also epistemological - why the brain-mind relation may not be fully decodable by finite procedures. In particular, analogies with mathematical theorems of un- decidability suggest that self-referential features of consciousness, such as multiple self-representations like those involved in strategic thought, may not be fully resolv- able by brain analysis. Assuming such limitations exist, this implies that ob jective analysis cannot exhaust sub jective experience in principle. A person’s consciousness and will are accessible to external observation only within limits. In some respects, we do not even learn to know ourselves except by our actions. It thus appears that a scientific look at consciousness and the human mind, combining universal physi- calism with epistemological scepticism, is not inconsistent with certain concepts of sub jectivity that are current in the humanities, despite all the differences in the style and terminology of discourse.