In linguistics, a term for the use of multiple languages or dialects in one utterance. Whereas borrowing involves no shift in pronunciation or even modification of a foreign word or phrase to better fit the phonotactic constraints of the language it is borrowed into, code-switching involves a full phonetic shift as well as adherence to certain social and grammatical constraints, discussed below.

Obviously, there is little value to code-switching in conversation with someone who doesn't know the languages being alternated, but code-switching is an important aspect of language use among bilingual speakers. It can be used to fill lexical gaps --- words that are not known in one language can be replaced with synonyms from another --- or in conveying ideas foreign to one language --- for example, information that is culturally specific, like names of certain food items. Even non-native speakers of a language may find themselves code-switching or borrowing for this latter purpose, and loanword formation may ensue if a code-switching or borrowing proves particularly useful and spreads into common use.

Some uses of code-switching are less universal: for members of bilingual linguistic minority groups, code-switching can be a way of marking the distinctions between two languages: if this is the case, the two may also be associated with separate social, economic, and political worlds. Borrowing tends to blur such distinctions along with phonetic differences. In societies where bilingualism is rare, code-switching most often takes place among family members or close friends. As such, it can be used as a sign of intimacy or to convey secrets. Although this last use is rare, many monolinguals in the presence of code-switching bilinguals nonetheless suspect they're being talked about. Personally, I might code-switch for secrecy like I might whisper in monolingual conversation, if I don't want people listening in on me, but it's just as impolite to code-switch about someone as it is to whisper secrets about them right under their nose. Most bilinguals will agree with me when I say I code-switch primarily for convenience, without really thinking about it.

As with borrowing, there are syntactic constraints on code-switching. These are the subject of intense study and debate. For instance, most researchers agree that it is almost never grammatical to code-switch within a word. There are exceptions to this rule, but they are rare. Similarly, many theories hypothesize that the syntax of an utterance must match the language of the vocabulary being used: code-switching is possible when, for example, the word order of a sentence or noun or verb phrase is the same across the two languages being alternated. Switches rarely occur mid-phrase: for example, modifiers generally match the language of the noun or verb they are associated with.

On a related note, there appears to be a hierarchy of loanability (this might be a more appropriate topic for the borrowing writeup; I'm not sure). Based on studies of loanwords in various languages, nouns are far more likely to be code-switched or borrowed than any other grammatical category. Verbs or adjectives come next, depending on the language in question, and function words like prepositions and pronouns are last of all. This hierarchy is similar to the idea of open and closed categories in the study of language change: the former include nouns, verbs, and adjectives, which tend to change most rapidly, and the latter include pronouns, prepositions, and conjunctions.

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The main definition of a code switch is when someone shifts from one language to another during a conversation. The shift can be as brief as a single line of Spanish that concludes an English conversation. Some of our bilingual noders may do this subconsciously, especially when talking to other bilingual speakers. I knew a girl who was trilingual in English, French and Spanish; she would make a code change to each language by the end of any given conversation. Sometimes you needed a whiteboard to talk to her. Sometimes you needed anti-crazy pills, but those are stories for another day.

When I first heard the term "code change" my computer science brain took over and I thought about PHP and HTML mixes or something similar. I had to admit that I was pretty far off with that assumption, and let's face it, what does my anthropology professor know about PHP?

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But what if I'm not far off with that assumption? I was thinking in terms of formal languages and strings, but natural languages aren't that far off. Formal languages would just be a subset of a broader language set. So PHP and HTML make for a valid code change! So does a C based CGI program outputting HTML! That means English and Java are also a valid code switch. Hmm++.

then

So how many code switches do we perform in a given day? How many languages do we really speak, inside or outside of the English language? For instance, in the course of my average day in class, I speak Java and XML for web development, C and SDL for game programming and RDF for semantic web development. When I kick back at the end of the day and hit up the message boards, I'm speaking Fordese to my fellow Mustang owners.

So how many languages do you speak? I think it's something to be proud of, whether or not you speak multiple, distinct natural languages or different languages within the English domain. Or a combination of the two. When all those languages start to blunder into one another in your brain, what code change does that cause? Can we keep our native languages independent of the secondary languages or do we have some sort of code fusion?

I can't give you a precise linguistic description of what code switching is. Wiki and the other writeups in this node have a fairly good descriptions at any rate, or at least they seem good to my untrained eye. But what I can do, is that I can tell you what code switching feels like.

I can, however, give you a brief and possibly innaccurate explanation of what it's supposed to be. It's a multilingual phenomenon when a speaker changes the way they say a word, phrase, or sentence to a different language but completely adhering at least to the phonological rules of the other language, often the syntactical and morphological rules too. It is different from pidgin or creole languages in that the two different languages do not blend into each other; rather, the two languages are kept distinctly separate and the discourse completely switches between the rules of one language or another, hence the name, code switching.

I suppose my definition is broad enough to admit that a code switcher may not sound like a native of speaker of any of the languages they code switch from, but at least I always think of a code switcher as someone who has more than one native language (like myself, whom I consider to have English and Spanish as native languages). In my very unscientific opinion, (remember kids, linguistics is a science after all), if you aren't a native speaker of both languages, then you aren't really code switching. It's different for an L2 speaker to dig around in the vocabulary or grammar of a different language for an expression not found in the L1 language, or viceversa, than for a speaker of more than one L1 language to once in a while, even though they're perfectly capable of restricting themselves to just one language most of the time if they really need to, to once in a while just feel that one language or another can express a specific thought in a better way.

Remember that like everything else in our language, there are some systematic rules on when and how code switching can occur and when and how it can't. Code switchers develop their own precise grammar, as it happens with almost all other linguistic phenomena, and it's thus vulnerable to the same systematic and scientific analysis of the rest of our language skills.

Now for my personal experience. I acquired my code switching as a blessing from my parents who managed to give me the best education that money could buy. Usually when people hear me code switch from Spanish to English, they assume that I am able to do it because I lived in an English-speaking country. Well, as a matter of fact I did, but I was able to code switch before I lived there. I've been able to code switch almost since I've been able to speak, for I was given two native languages, and I was fully educated in two native languages, in two cultures. I do not feel like a third culture kid, but I am close in a way because of the extra language I was given that most people around me don't have.

As a child, code switching seemed like the most natural thing for me, and of course it seemed ordinary enough, since all the other students at my school could do it too. We would speak both languages freely switching between the two, admittedly sometimes mangling one language or another due to interference between the two. This is a different phenomenon from one all too common in many parts of the US with a high proportion of Spanish-speaking immigrants and colloquially known as Spanglish, where in some places it's already evolving into creole or pidgin languages. I remember once in New York state in a bus station listening to some kids speaking this Spanish-English creole language, and I had difficulties understanding what they were saying because they already had a different grammar than either of the languages that spawned their creole. I do think that within the next couple of decades we may see a creole language such as this one properly established in many parts of the US.

But again, code switching is different. My classmates and I didn't create our own personal private language with different grammatical rules than the two languages we created it from. I mean, yes, there are grammatical rules on when and where you can code switch, but the resulting sentence should be understandable to any speaker of both languages, not just to other code switchers (well, if written down anyways, perhaps the mixing of two different phonologies may confuse some listeners). I guess that having three hours of class in Spanish by a native Spanish speaker followed by recess and three more hours of class in English by a native English speaker, and usually exact same subjects too, at least in elementary school up to grade five, was what prevented me and my classmates from mangling either language too much. After all, we were forbidden from addressing our Spanish teacher in English or our English teacher in Spanish, and supposedly we couldn't talk to each other in a language different than the class we were in (but yeah, right, I'll dare any teacher to really enforce that rule). Of course, in recess, in the playground, any language was free for all. Korean, Japanese, Portuguese, and French were the most popular alternatives, and perhaps an expletive in Yiddish, Hebrew, or Arabic now and then for the kids who still had some vestiges of it in their ancestry.

Middle school and high school were a little different, with everything in English except the courses that had to be in Spanish (Mexican history, Spanish etymologies, Latin American literature, that sort of thing), but it did keep on cementing the notion that there were two languages and that they were different, and that's how they should stay. The net result of this is that the other kids like I that stayed for twelve years in this school, or for a similarly long enough period, ended up becoming fully bilingual in formal situations and fervent code switchers in informal ones. We talked to each other freely code switching from one language to another, now interspersing a sentence in English amidst Spanish discourse, sometimes doing the reverse, sometimes only a word, but without ever assimilating an English word into Spanish phonology nor the reverse. We wrote term papers in both languages, sometimes confusing the punctuation rules of one language for the other, and sometimes even charmingly spelling things like "alphabeto" which in Spanish would be pronounced "alpabeto" if written like that instead of "alfabeto". All of this seemed ordinary to me at the time, but now that I recount it, I'm seeing more and more what a wonderful lifelong gift my parents gave to my brother and me by giving us a fully bilingual, bicultural education like that, making the world a little smaller and a little more digestible for us.

I know that my experience is by no means unique. In places like fully bilingual Montréal, where a large portion of the population speaks two languages (60%-70%, as I recall, maybe more) or even three (about 30% of Montrealers speak three languages fluently, as I recall), code switchers abound. Nevertheless, and again, very unscientifically, sometimes being a code switcher is a little lonely.

When you're a code switcher, you're a bit of a freak to everyone. Speakers of the languages you code switch from get a little envious of your abilities, wishing they could speak the languages as well as you could. They even chastise themselves for not paying enough attention in their foreign language classes in school when the fact remains that all the code switchers I know acquired the skill effortlessly through the benefit of simply being immersed in more than one language since childhood. When you're a code switcher, you can't always find the exact words in one language or another to say what you want to say, although you can almost always find a good enough approximation. You can't speak in your most natural state to almost anyone; you have to rely on the aforementioned approximations. Sometimes, when someone sees you code switching, you become a little foreign to them. Being from more than one place sometimes means you're from nowhere.

Of course, being a code switcher also means that you have at least two separate worlds and cultures completely at your disposal, that you can move between one and the other with great ease. It means being able to understand cross-linguistic puns, and to read several authors in their respective native languages. It's an amazing gift (in my case, literally, since it was a gift my parents were able to give me) that I wouldn't ever trade for monolingualism, even if this meant that I would be less of a freak. At any rate, most of the time I can keep my code switching under control, as I am doing now, and stick entirely to one language or another for the benefit of my audience.

When you get very specific, though, my most natural language environment is the one I grew up in, with heavy Mexico City slang code switching back and forth between English. This greatly narrows down the possibility of fellow code switchers with whom I can feel at greatest ease. Whenever I meet a girl who code switches from exactly the same colloquial Mexico City Spanish and English, it is by itself almost an immediate turn on and makes me want to get down her pants as soon as possible. If the code switcher is a guy, I feel a special connection with him too. You're like me! You understand me! Oddly enough, the precise variety of English isn't as important for me, no doubt because I never lived as a child in a specific English environment, having as teachers native English speakers from all over the world (mostly from the US, but I've had Canadians, Australians, Brits, and a few from other places too).

I never realised it as a child and teenager, while I was in my little code switching bubble where most everyone else was like me, and it seemed like the most natural thing in the world. As I've broken out of that bubble through the years and stumbled across other code switchers around the world, I've come to realise how important code switching is for me and deeply embedded into my identity it is. Bilingualism is cool, polyglots doubly so, but if you can code switch with me into the same languages I can, I'll probably fall a little in love with you.

One essential difference between cats and dogs in terms of their interactions with human beings is this:

Dogs recognize that we are a different species to them, and modify their body language and behavior and interpret what we do differently to the way in which they interact with other dogs. 

Cats, on the other hand, either do not understand on some level that we're not cats, or don't care. Most likely the latter. They treat us like larger bipedal cats, and interpret what we do as if another cat had done it. In fact, there's some evidence that they think (or at least act) like we're very large, very incapable kittens. They bring us dead things (which they do to kittens as the "first step" to teaching them to hunt) and they vocalize to us the same way kittens do, in a far lower range than they do with each other.

If you're in a culture other than the "norm" of being a white, Anglo-Saxon male you will probably (at least subconsciously) change things like body language, word choice, inflection and topics of conversation to "adapt" or otherwise not draw attention to yourself. If you are black, especially female, there's usually a strong societal pushback to you expressing anger - people tend to stop listening to you even if you have every reason and right to be angry and just characterize you as a stereotypical "angry black woman". 

But it's seen as yet another microaggression to a lot of people - that you have to modify everything about yourself in order to maintain the comfort of a larger body of people around you - especially ones who historically have mistreated people who look like you. The expectation to straighten your hair or not wear a style like dreadlocks because "ethnic" (read: black) hair is not seen as "professional". There's also the disturbing fact that prior to the civil rights movement there was an expected code of conduct of people of color, which included things like stepping out of the way of someone who was white and even stepping off the sidewalk entirely to let the white people pass. In that context, some see "code switching" as an extension of the idea that there's a group of people who are privileged and expecting that everyone stay in lock-step with their expectations.

You will sometimes see a Facebook post with a small red "100" symbol - a larger 1 with two smaller 0's, both of which are underlined. That's come to mean "Keeping it 100%", a term indicating that the speaker - at least in the context of the labelled communication - is NOT code switching, is staying true to his or her identity, and to hell with code switching. 

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