What language do bilingual/multilinguals think in?

Their native language they were brought up speaking and speak with in every day life currently. For example, I speak English "natively" but I also speak fluent Gujarati and advanced Spanish. Since I use English the most to talk to friends, in school, everywhere, this is naturally the language I think in.

Their native language they were brought up speaking and speak with in every day life currently. For example, I speak English "natively" but I also speak fluent Gujarati and advanced Spanish. Since I use English the most to talk to friends, in school, everywhere, this is naturally the language I think in.

Most of our thinking won't be in any language, just subconscious thoughts.

When we think 'in a language', as you said, we talk to ourselves in our head, and so just as we choose what language to talk to others in, I reckon we can have preferences in our head when talking to ourselves, depending on the topic/situation.

Let's say you grew up speaking English at home, and then went an did a Physics degree in Germany - you might be more inclined to think about household tasks in English, but you'd probably think about Physics in German, as you'd be familiar with discussing the subject in that language.

I am a native German speaker, and in fact grew up in Germany, but I often shift the language I'm thinking in because I find it much easier to communicate my thoughts when thought and expression of thought are... synchronised, I guess.
Like when I'm reading something on TSR, naturally I'm reflecting on it in English and process it in English. But when I talk to a good German-speaking friend just minutes later, I think in German.

I agree about the degree bit. Your technical knowledge of physics would all be in German, you wouldn't know the English words for those technical concepts/objects. So naturally you would have to think about those things in German.

I am a native German speaker, and in fact grew up in Germany, but I often shift the language I'm thinking in because I find it much easier to communicate my thoughts when thought and expression of thought are... synchronised, I guess.
Like when I'm reading something on TSR, naturally I'm reflecting on it in English and process it in English. But when I talk to a good German-speaking friend just minutes later, I think in German.

What about neutral thinking, when you are thinking to yourself on your own. Would that be in your stronger language?

My first language and the language which I speak at home is Urdu with parents and english with siblings. But I think to myself in English.
hmm.. that is a very interesting point. I think the language which you speak more of generally and the enviroment in which the language is common allows your mind to adapt thinking according to that enviroment. Just depends on experience and accessibility, e.g. I find it much easier to put it into words of what I'm thinking.

When we reason in our minds, we talk to ourselves. Yet, sometimes we think in images (visualizing) or even sounds (remembering a piece of music). Synesthetic people may combine the senses. Some autistic savants may only think visually or other sensory manners and never properly develop their verbal skills. Predominantly, animals would most likely think visually.

I'm not a native English speaker but even at a young age I'd use to think in English. Sometimes, I'd know the word in English without knowing the equivalent in my own language. As I live in the UK now, I tend to think in English for the most part.

It really depends on the person and the brain. When we think about something, whether visual, auditory, abstract or otherwise the parts of the brains that are responsible for coding these experiences fire up, and, at the end of the day, all that matters is the exposure you've had to the specific stimuli. If you were exposed to English more than you were to your own language, than you may have an affinity to think in it.

It depends who I'm talking to.

I've lost most of my second language now through not using it, but sometimes I think random phrases or answers to things in it.

So you only think in English then?

You don't think in a particular language unless you are thinking about talking to someone. In which case, depends who you are thinking about talking to and in what circumstances.