I am going to take a moment out of my busy morning of eating girlscout cookies (my single greatest discovery of American cuisine so far) and be a party pooper (I'll give one of aforementioned cookies to anyone who can explain to me where the term 'party pooper' came from)
First off, I'd like to say that the video in the first post is extremely unimpressive to me. That's very average in skill for a foreigner who has been studying fairly seriously for a while. It's the same level as students who have studied four semesters of Japanese at a college, aka: upper beginner. She has many years to go before hoping to reach fluency in the language, and if she truly only studies from anime then I doubt that will ever happen period
Media is an excellent source of reinforcing vocabulary and grammar, and encountering something you've studied in the Real World (linguistically speaking) most assuredly cements it in your mind. And it's through repeatedly hearing, seeing, and using those words verbally and in thoughts that you further strengthen those things. I wholeheartedly support listening to music, watching videos, and all other forms of media; after all, language study doesn't exist in a vacuum, and the reason something is studied is for it's practical application.
But that being said, spreading the notion that you can "learn from anime" I think is very deceitful and just a holy grail for many foreigners learning Japanese. Many get into the language because of anime in the first place, and surely watching Dragonball is more fun to a lot of people than studying grammar, drilling kanji, etc. And they think, "Oh, wow, wouldn't it be AMAZING if I could simply learn by doing what I already love?"
And yes! Learning by doing what you love is wonderful. If you don't enjoy learning a language then you're not going to spend much time on it.
But learning entirely by watching anime is akin to a pianist thinking that he can suddenly play Chopin's impromptus when he sits down at a keyboard simply by listening to the recordings a lot. It's not going to happen. Ever.
I see some people citing that learning from media is how they developed their first language in childhood. Acquisition of a first language as a child, and a second language as an adult are completely different neurological processes and aren't really applicable to each other.
Is it possible to learn from anime? Yes. Most people who take their first university class in Japanese already know tons of random words if they've watched a lot of anime. They pick up on things after hearing them in repetition so much with the translated subtitles underneath. If I ask them what やめて means, they can tell me instantly, but they have no underlying understanding of the grammar. They don't know what the verb itself is, what conjugation it's in, how to create that conjugation, etc. All they've developed is this basic correlation of what they hear, and what they see as the English translation. And they might pick up on a few dozen random nouns after watching hour after hour of anime, but how incredibly inefficient is that? They could learn a hundredfold of the material in sincere studying as opposed to random osmosis whilst watching anime.
I suppose efficiency is the main point I'm trying to get across here.
Not to mention that the adult brain is not capable of simply being thrust into a language and picking up on grammar as a child would. We make correlations between nouns and other expressions, yes: if people say 宇宙人 constantly in scenarios where there's an alien, your mind eventually will make that link of, "Hmm....宇宙人=alien!" but surely no one thinks this is efficient? Not to mention the fact that it only works for things easily associated, requires a large amount of repetition for the correlation to become certain, and will never work for more abstract things. Grammar cannot be learned this way.
Which brings me to the point that actual study and practice of a language is required before you can use media to 'cement' the things you learn. You could pick up a book on your first day of Japanese, have to use a dictionary for every word, but that's decoding. Your brain isn't going to make the strong "AHA!" connection it makes as it does when knowledge is already there, and then it encounters it. The more your brain deems something to be useful (how often you encounter it) the more likely it is to enter long term storage. I think you guys know what I am talking about: when you've studied something, then finally encounter it in a novel or in conversation or whatever, and it really CLICKS.
Perhaps I am ranting on tangents. The gist of what I am trying to say is that watching anime is in no way, shape, or form a substitute for actual studying. An episode of anime is, what, about 25 minutes? When you watch a lot of it, that really adds up. Think about how much more you could learn in that amount of hours when you're doing dilligent studying of the language. Like I said: it's hundredfold.
Edit: Argh! One day I will be able to make a post without finding silly grammatical mistakes and such when I read through it
Edited: 2010-03-02, 12:03 pm