If a person is brought up speaking 2 languages?......?

The one they use the most in their everyday life. Like me, I speak english and spanish about the same, but think in english most of the time.=D

Well, thinking isn't much of a matter where you're thinking actual words in your head, but I'd imagine it more to be of pictures or actions... If I were speaking to you in French or Spanish, I'd be thinking in English, because it's what I first have heard. Whatever is heard more, you know? I'm pretty good with Spanish, but I'll always be thinking in English. I don't think it's too common where a person learns two native languages from day one. There HAS to be something that is in some way more dominanting than the other. :]

My unclue once offered an interesting view on which language u are the most proficient in: "see what language you use in your dreams at night." But in my personal experience, I grew up speaking both my dad's language and my mom's language, then when I turned 9 I was introduced to a 3rd language. Now I'm 23, I think in all 3, speak in all 3, and dream in all 3. Which language I actually "think" in the moment is directly related to how much of that language I have been exposed to in one particular day. If I went to see my dad's relatives who communicate in his language, when I go back home and think to myself, "what a wonderful day I just had!" I would think in my dad's language. If I just went out to chill with my peeps, and I go home and think, "the movie was awesome!" Then I would definitely be thinking in English...or if I just had an argument with my mom and think "Grrrrr mom is being so overreactive!" Then I'm sure I'd be thinking in my mom's language!

So it really is the amount of exposure that dictates the choice of language your brain adopts in the moment...

Both equally. They don't have to think about what language they are using. It is an automatic thought process. When they need one language, they automatically think in that language.

I am bilingual, and that's how it is for me!

That's an interesting question. I was brought up speaking both Japanese and English, and I think in both. For example, since I live in the U.S. now, and I talk to my friends and family in English, I speak in English in my head. However, since I learned the multiplication table in Japanese, even though it's been many years now, I still think it in my head in Japanese.

I was raised up learning 3 languages and a dialect.

I believe i think on what I use most the time. If im in china... or if i read english books, or talk to my relatives. there are always different ways to think in different cultures

Either one or both at the same time. depending on the occasion: It could be the primary, the secondary or both at the same time.

Good question. I would think the one that is most commonly spoken by those around them in school/work.

English If they are in the US....