Andreas Kemmerling

Was Frege Liber Wahrheit sagt, lasst sich, mit ein wenig Gewalt, in zwei Schubfacher auiteilen} Das erste Schubfach — es trtigt die Aufschritt ,,Konstrul~:tives" enthalt die Lehre von der Wahrheit als Gegenstand und als Satzbedeutung. Das andere Schubfach —- mit der Aufschrift ,,Destruktives" —e ist reicher gefiilltg es finden sich hier Arguniente gegen die Korrespondenztheorie, gegen die De— iinierbarkeit von Wahrheit, gegen den Nutzen eines Walirheitsprttdikats und insbesondere Diagnosen dafur, welche Irrttimer den von Frege iiir falsch gehaltenen Auffassungen tiber Wahrheit zugrunde liegen. Solche Diagnosen sind in Freges Schriften oft nur angedeutet. Aber sie sind wichtig, wenn man verstehen will, was Frege an Konstwktivem uber Wahrheit zu s-agen hat. Frege halt das Wort ,,wahr" und seine Bedeutung, also den Begriff und damit die Eigenschait der Wahrheit, iiir letztlich witzlos; der Satz ,,Dass Meerwasser salzig ist, ist wahr" sagt seiner Auffassung nach nicht mehr und nicht weniger als der einfache Satz ,,Meeiwasser ist salzig". Aus diesem Grund ist Frege oft als friiher Vertreter der Redundanztheorie der Wahrheit eingeordnet werden.; Im folenden versuche ich zu zeigen, dass Freges Verhtilmis zur Redundanztheorie differenzierter betrachtet werden sollte. Der Gnmd: Frege unterscheidet zwischen verschiedenen sprachlichen Mitteln des Aussagens von Wahrheit, von denen das Wort ,wahr‘ das Unwichtigste ist. Er schreibt: ,,Die Form des Behauptungssatzes ist [...] eigentlich das, womit wir die Wabrheit aussagen, und wir bedtirfen dazu des 'Wortes ,,wahr“ nicht.·}a, wir ktinnen sagen: selbst da, wo wir die Ausdrucksweise ,,es ist wahr, dass ..." anwcnden, ist eigentlich die Form des Behauptungssatzes das Wesentliche." (Frege 1933, S. 140) In der logischen Notation des Systems der Grundgesetze schltigt sich diese Auffassung darin nieder, dass diese Sprache trotz der Redundanzthese zwei nichtredundante wahrheitstliematisierende Ausdrticke enthalt: erstens den sog. Waagerechten ,,—·-— §", der als ,4; ist das .Wahre“ gelesen werden kann, und zweitens den Urteilsstrich ,,|", durch dessen Voransetzung an ,,—— A" ausgedrtickt wird, dass der durch ,,-—— A" bezeichnete Wahrheitswert als wahr be..

Some leading neuro-scientists recently proclaimed an obviously false view that a human person is his/her brain. This falsity arises partly from the conceptual difficulties concerning personhood/a person. By revealing inexhaustible richness of the characteristics of this concept of a person, this essay explains why the concept is so utterly puzzling. The author contrasts Descartes’ concept of a person with Locke’s. For Descartes, the concept has four features: (1) it is the concept of the mind/body-union; (2) it is innate and a primitive (i.e. unanalysable) concept; (3) it is not clear-and-distinct (because it is primitive so that it cannot be reduced to clear-and-distinct concepts); (4) it is of enormous value (because it helps us to dissolve, not to solve, the mind/body-problem). Correspondingly, Locke’s concept of a person has another four features: (1) it is the concept of an entity which is justly rewarded/punished for its doings (including mental doings); (2) it is neither innate (no so-called innate concepts in Locke) nor primitive, but rather a complex idea which is reducible to the concepts of consciousness and memory; (3) it is clear and distinct (because it is made of clear and distinct simple concepts); (4) it is of enormous importance (not because it helps us to solve or dissolve the mind/body-problem, but because it is central to our conceptions of justice and self-care). Through the two examples, this article argues that the concept of a person indeed has inexhaustible richness that is historically caused because this concept is used by many thinkers as a conceptual tool or as a technical or semi-technical term for answering different questions in various distinct and incommensurable theoretical frameworks, so that quite different features have been introduced as characteristics of a person. Thus, we do not have a shared intuitive grasp of this concept, but only a common learned tradition which has bequeathed to us a blend of quite diverse conceptual features that were never meant to go together. The characteristic inexhaustibility of the concept of a person may result from the following reasons: (1) this concept is anthropocentric in its actual application; (2) it is not at all anthropocentric in its intension; (3) it is part of the concept of a person that persons are distinctively valuable.

Frege hat an seiner metaphysischen und semantischen Lehre der frühen 90er Jahre Veränderungen vorgenommen, um Besonderheiten des Sinns von „ich” Rechnung zu tragen. Diese Veränderungen betreffen zum einen den Status von Gedanken als objektiven Entitäten, zum andern betreffen sie die sprachlogische Behandlung von Ausdrücken, deren Sinn erst im Zusammenspiel mit dem Verwendungskontext einen selbständigen Gedankenteil ergibt. Diese Veränderungen lassen die alte Lehre in ihrem Kern unberührt. Doch obgleich Freges Auffassungen über den Sinn von „ich” eine kohärente Weiterentwicklung seiner Lehre darstellen, sind sie in ihren Einzelheiten nicht immer plausibel. Das gilt insbesondere für die These, das Wort „ich” habe im Denken und im Sprechen ein und derselben Person unterschiedlichen Sinn.

There is ample evidence for this claim, both in time-honoured works and in recent publications. Before I concentrate on some of the old stuff, let me briefly turn to recent examples. The following sample of quotations from a Nobel Laureate, a leading neuroscientist and a German professor of ‘neuro-didactics’ may illustrate how deep the confusion about what a person is can go among the educated, even today. Francis Crick stated his Astonishing Hypothesis as follows: “You” [...] are in fact no more than the behaviour of a vast assembly of nerve cells and their associated molecules. As Lewis Carroll’s Alice might have phrased it: “You’re nothing but a bunch of neurons.” This idea is so alien to the ideas of most people alive today that it can truly be called astonishing.1 A few years later, this ‘idea’ seemed not anymore astonishing to Michael Gazzaniga who prefers to put it this way: Some simple facts make it..

In his book Naturalizing the Mind, Fred Dretske, among other things, gives what he thinks is a naturalist account of what he calls introspective knowledge.1 I shall not quarrel with his labels; I shall quarrel with what he tries to sell by using them. For him, introspective knowledge is “the mind’s direct knowledge of itself”,2 and he concentrates on knowledge of one’s own current mental occurrences, especially those which belong to the realm of sensory perception. An example he discusses is the knowledge somebody has who looks at something and sees it as blue, and thereby knows that he is, as Dretske puts it, “representing” it as blue. I shall stick to this example. Harvey is looking at my shirt, and he thereby comes to know that he is representing it as blue. Dretske wants to answer the question: What is really happening when Harvey acquires this piece of introspective knowledge? Let me first give, in a very rough way, what I take to be Dretske’s basic idea. Introspective knowledge is not acquired by anything like looking inside oneself. One looks in the same direction as one does when one is acquiring “extraspective” knowledge. Harvey doesn’t first look at my shirt, saying “Uhuh, this shirt looks blue, but now I’d like to find out how I am representing it”, and then turns to look at something else in order to find out what the colour is he is representing the shirt to have. Harvey only looks at the shirt, when he acquires this item of introspective knowledge. In looking at that shirt, he acquires all the information he needs for acquiring the knowledge about himself that he is representing it as blue. The eyes’ job is done. The rest is exploiting that very information, not acquiring any new information