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Philosophical Investigations (Philosophische Untersuchungen), along with the Tractatus Logico-Philosophicus, is one of the two major works by Ludwig Wittgenstein. Wittgenstein had worked on the book for many years and it was published posthumously in 1953, originally in German. It deals mainly with semantics, and how conceptual confusion surrounding language use is at the root of most philosophical problems, however in the process logic, the foundations of mathematics and the nature of consciousness are discussed. It is generally considered one of the most important philosophical works of the twentieth century and it continues to influence current philosophy of mind and language.
Philosophical Investigations is unique in its approach to philosophy. Most philosophical texts present a philosophical problem, summarize and critique previous philosophy on the subject, present a thesis on how to solve the problem, and then provide argumentation in favour of the thesis. In contrast, Wittgenstein's book treats philosophy as an activity, asking the reader to work through various problems and do the actual work of philosophy. Rather than presenting a philosophical problem to be solved and a solution, it engages in a dialogue, where Wittgenstein provides an example situation, articulates how one might be inclined to think of the situation, and then shows why one's inclinations suffer from conceptual confusion. For example, here is an excerpt from the first entry in the book:
- "...think of the following use of language: I send someone shopping. I give him a slip marked 'five red apples'. He takes the slip to the shopkeeper, who opens the drawer marked 'apples', then he looks up the word 'red' in a table and finds a colour sample opposite it; then he says the series of cardinal numbers—I assume that he knows them by heart—up to the word 'five' and for each number he takes an apple of the same colour as the sample out of the drawer.—It is in this and similar ways that one operates with words—"But how does he know where and how he is to look up the word 'red' and what he is to do with the word 'five'?" Well, I assume that he 'acts' as I have described. Explanations come to an end somewhere.—But what is the meaning of the word 'five'? No such thing was in question here, only how the word 'five' is used."
This is a typical example of the style throughout the book. We can see each of the steps in Wittgenstein's method:
- The reader is presented with a thought experiment: someone sent shopping with an order on a slip.
- Wittgenstein articulates what the reader's reaction may be: "But how does he know where and how he is to look up the word 'red' and what he is to do with the word 'five'?... But what is the meaning of the word 'five'?"
- Wittgenstein shows why the reader's reaction was misguided: "No such thing was in question here, only how the word 'five' is used."
It is through these thought-experiments that Wittgenstein attempts to get the reader to come to certain philosophical conclusions by himself or herself, rather than being convinced by a succinct argument for those conclusions. This method of philosophy can be very effective and rewarding, however it makes it hard to provide philosophy students with a good understanding of Wittgenstein's philosophy without having them work through the book for themselves.
The text is divided into two parts, consisting of what Wittgenstein calls, in the Preface, Bemerkungen (translated by Anscombe as "remarks"). In the first part these remarks are rarely more than a paragraph long, and are numbered sequentially. In the second part the remarks are longer, and numbered using Roman numerals. In the Index, remarks from the first part are referenced by their number rather than page; however references from the second part are cited by page number.
Natural language, meaning and use
Wittgenstein's method leads to the common summary of Wittgenstein's argument in the Investigations: "Meaning just is use" — that is, we don't define words by reference to things, but by how they are used. For example, this means there is no need to postulate that there is something called good which exists independent of any particular "good deed." This is one line of thought in the book, contrasting for example with Platonic realism.
The Investigations deals largely with the difficulties of language and meaning. Wittgenstein viewed the tools of language as being fundamentally simple, and that philosophers had obscured this simplicity by misusing language and the asking of meaningless questions. Wittgenstein attempted in Philosophical Investigations to make things clear, and 'shew the fly the way out of the fly-bottle'.
Meaning and definition
Over the course of the discussion, Wittgenstein rejects a variety of ways of thinking about what the meaning of a word is, or how meanings can be identified. He shows how, in each case, the meaning of the word presupposes our ability to use it.
As is common in Wittgenstein's later works, he first asks the reader to perform a thought experiment, namely to come up with a definition of the word "game". While this may at first seem a simple task, he then goes on to lead us through the problems with each of the possible definitions of the word "game". Any definition which focuses on amusement leaves us unsatisfied since the feelings experienced by a world class chess player are very different from those of a circle of children playing Duck Duck Goose. Any definition which focuses on competition will fail to explain the game of catch, or the game of solitaire. And a definition of the word "game" which focuses on rules will fall on similar difficulties. The essential point of this exercise is often missed. Wittgenstein's point is not that it is impossible to define "game", but that we don't have a definition, and we don't need one because even without the definition, we use the word.
Everybody understands what we mean when we talk about playing a game, and we can even clearly identify and correct inaccurate uses of the word. All without reference to any "definition". Wittgenstein argues that 'definitions' are emergent forms from what he termed 'forms of life', which are the culture and society from which they emerged. One thing Wittgenstein stresses very strongly in Investigations are the social aspects of cognition: he went so far as to term Investigations a kind of anthropological exercise. To see how language works, we have to see how it functions in a specific social situation. It is this emphasis on becoming attentive to the social backdrop against which language is rendered intelligible that explains Wittgenstein's elliptical comment that "If a lion could talk, we could not understand him." 
Elsewhere, Wittgenstein rejects the idea that ostensive definitions can provide us with the meaning of a word. For Wittgenstein, the thing that the word stands for does not give the meaning of the word. Wittgenstein argues for this making a series of moves to show that to understand an ostensive definition presupposes an understanding of the way the word being defined is used. So, for instance, there is no difference between pointing to a piece of paper, to its colour, or to its shape; but understanding the difference is crucial to using the paper in an ostensive definition of a shape or of a colour.
Why is it that we are sure a particular activity -- Olympic target shooting -- is a game while a similar activity -- military sharp shooting -- is not? Wittgenstein's explanation is tied up with an important analogy. How do we recognize that two people we know are related to one another? We may see similar height, weight, eye color, hair, nose, mouth, patterns of speech, social or political views, mannerisms, body structure, last names, etc. If we see enough matches we say we've noticed a family resemblance. It is perhaps important to note that this is not always a conscious process -- generally we don't catalog various similarities until we reach a certain threshold, we just intuitively see the resemblances. Wittgenstein suggests that the same may be true of language. Perhaps we are all familiar (i.e. socially) with enough things which are games, and enough things which are not games that we can instantly categorize new activities intuitively.
This brings us back to Wittgenstein's reliance on indirect communication, and his reliance on thought-experiments. If many philosophers are confused, it is because they aren't able to see the family resemblances. They've made mistakes in understanding the vague intuitive rules language uses (which Wittgenstein calls the rules of the language game), and have thereby tied themselves up in philosophical knots. He suggests that an attempt to untangle these knots requires more than simple deductive arguments which point out the problems with their particular position. Instead Wittgenstein's larger goal seems to be to try to divert them from their philosophical problems long enough to indirectly re-train their intuitive ability to see the family resemblances.
Wittgenstein develops this discussion of games into the key notion of a language game. A language game is a way of using words. He introduces the term using simple examples,  but intends it to be used for the tremendous range of ways in which we use language.. In one game, a word might stand for things to be manipulated, but in another the same word might be used for asking questions or giving orders. "Water!" can be an exclamation, an order, a request or an answer to a question; which, depends on the language game in which it is being used. "Water" has no meaning apart from its use within a language game.
Wittgenstein also ponders the possibility of a language, the subject of which is only known the user; the usual example is that of a language in which one talks about ones sensations and other subjective experiences, and only to oneself. Such an imaginary language is usually called a private language.
The possibility of such a language is intimately connected with a variety of other themes in his later works, especially his investigations of “meaning”. For Wittgenstein, there is no one, coherent “simple” or “object” that we can call “meaning” (to him, this is the source of many philosophical confusions). Meaning is a complicated phenomenon that is woven into the fabric of our lives. A good first approximation of what he is up to is that meaning is a “social” event; meaning happens between language users. As a consequence, it makes little sense to talk about a private language, with words that mean something in the absence of other users of the language.
Wittgenstein presents several perspectives on the topic. He discusses pain in some detail, making the somewhat surprising claim that one does not know that one is in pain. Whereas others can learn of my pain, I cannot; rather, I simply have my own pain. For Wittgenstein, this appears to be a grammatical point, part of the way in which the language game of pain is played.
But the core discussion centres on how one could possibly use the words of a private language.. He invites us to consider a the case in which someone decides that, each time they have a particular sensation, they will place a sign S in their diary. He points out that in such a case, we could have no criteria for the correctness of our use of S. Again, several examples are considered; one is that perhaps using S involves mentally consulting a table of sensations, to check that we have associated S correctly; but in this case, how could the mental table be checked for its correctness? "As if someone were to buy several copies of the morning paper to assure himself that what it said was true", as Wittgenstein puts it..
Often, what is widely regarded as a deep philosophical problem will vanish, eventually being seen as a confusion about the significance of the words that philosophers use to frame such problems and questions. It is in this way that it is interesting to talk about something like a “private language” - it is helpful to see how the “problem” results from a misunderstanding.
Wittgenstein argues that if we can talk about something, then it is not private, in the sense considered here. But conversely, if we consider something to be indeed private, it follows that we cannot talk about it.
Wittgenstein discusses this using another thought experiment. He asks us to imagine that each of us has a box, inside which is a beetle. No one can look inside anther's box, and each claims to know what a beetle is only by examining their own. Wittgenstein suggests that in such a situation, the word "beetle" could not be the name of a thing, since each of us might have something completely different in our box; the beetle "drops out of consideration as irrelevant".
The discussion of private languages was revitalised from 1982 with the publication of Saul Kripke's book Wittgenstein on Rules and Private Language. In this work Kripke developed from Wittgenstein's text an argument for scepticism towards rules, and hence towards meaning. Kripke's account, although philosophically interesting on its own merit, has been facetiously called Kripkenstein.
Seeing that and seeing as
In addition to such ambiguous sentences which can be understood in more than one way, Wittgenstein discussed figures which can be seen and understood in two different ways. One example Wittgenstein used was the "duckrabbit". What is going on when you see it as a duck then as a rabbit?
As the gnomic remarks in Investigations indicate, Wittgenstein wasn't sure. But one thing he was sure about was that what couldn't be happening was that the external world stayed the same, and an 'internal' cognitive change took place. When one looks at the duck-rabbit and sees a rabbit, one is not interpreting the picture as a rabbit, one just sees a rabbit. For Wittgenstein, thought was ineluctably social, and therefore, there really was no 'inner' for anything to happen in.
Some people have argued, therefore, that Wittgenstein was a behaviorist. In a sense this is true, but in another it misses the point. Wittgenstein did not want to be a behaviorist, but nor did he want to be a cognitivist or phenomonologist either. As always, for Wittgenstein, there is only one way to look at the matter, which is simply to look at the facts of linguistic usage. Then, according to him, one would see that no 'theory' is possible; there are only the facts of language use. The extent to which he succeeded in this task is, of course, very controversial.
Relation to the Tractatus
In Philosophical Investigations, Wittgenstein deconstructs his own earlier arguments (as explained in the Tractatus) with respect to human language. In remark #23 of Philosophical Investigations, he points out that the practice of human language is more complex than the simplified views of language that have been held by people who want to explain or simulate human language by means of some formal system. It would be a disastrous mistake, according to Wittgenstein, to see language as being in any way analogous to formal logic. Instead, language showed indexicality and was context-bound (cf contextualism). To show this, he constructed many sentences that can be interpreted in more than one way. One of the most famous is, "Philosophy is a battle against the bewitchment of our intelligence by means of language." Does this mean:
- that philosophers use language to combat bewitchments, or
- that philosophers battle bewitchments caused by language itself?
But to repeat, Wittgenstein did not view himself as arguing that language was indexical so much as showing that it was.
The book was not ready for publication when Wittgenstein died in 1951. G. E. M. Anscombe translated Wittgenstein's manuscript and it was first published in 1953, and is now in its third edition which incorporates Anscombe's final revisions, and has been repaginated. There are two popular editions of Philosophical Investigations, both translated by Anscombe:
- Prentice Hall, 1999 (ISBN 0024288101)
- Blackwell Publishers, 2001 (ISBN 0631231277). This edition includes the original German text in addition to the English translation.
On Certainty - another book by Wittgenstein
- The first 100 remarks from Wittgenstein's Philosophical Investigations with Commentary by Lois Shawver.
- Wittgenstein's Beetle - Philosophy Online
- The Complications of PI 43
- Ludwig Wittgenstein: "The Private Language Argument" from the Philosophical Investigations, 1953
Remarks in Part I of Investigations are preceded by the symbol "§". Remarks in Part II are referenced by their page number in the third edition, and are preceded by "p."
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §1
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. Preface
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §77
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §97
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §309
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §3
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. p.190
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §26-34
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §66-§71
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §7
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §23
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §243
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §246
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §248
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §256 &c.
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §265
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §293
- Kripke, Saul. Wittgenstein on Rules and Private Language. Basil Blackwell Publishing, 1982.
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. II xi
- Wittgenstein, Ludwig. Philosophical Investigations. Blackwell Publishing, 2001. §307-308
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