man... amar brain khattan ken. lolz
nah gud topic. never thought abt it. mogos dhulai holo amar.
i think everybody thinks, as in babies, early life form too but just not in language.
in the form we are not really used to. Icy bhai jemon bolo. "own languge"
let me explain why... in order to learn shob kichu normal hoytey hoy as in all ure senses, all the functions of ure brain. body nd brain jokhon communicate korey oyta tau like signal er uporey tai nah. so ototuk tau thakkey bachar. aste aste boro hoy ma r pette and starts picking stuff up. oytar agey just warm up boltey paren.

oi warm up ta amra bujhbo nah. cuz oyta language nah. their earlier form of recognition or communication.
ma ja shuney, boley, dekhey, baby ra o dekhey, boley, shunney. so jader probs nai, ora pick up korey early and think normally in their familar language.
but a baby who is born deaf. ora pick up kortey parey nah. in fact ora bujhey o nah that they r missing out on sumthing. kintu ono senses r functioning, and oi gulir signals tau brain ey jachey. oi bhabey pick up korey. so dekhey parey, feel kortey parey taste kortey parey but shuntey or kotha boltey parey nah. dekhey imitate kortey parey but really shobdo guli ki bujhey nah. and by then, family discovers, baby has a defiency and hoyto sign language shikhano shuru korey.
blind baby - pettey shob shunney...
deaf/mum baby - dekhey
next question:
blind nd deaf baby ra function kemney korey?
onek tough. jibon wud suck omney. kintu again... they r moving, they can feel nd sense.
oyta tey joto tuk ora catch korey. as for thinking without a lingo, as for a baby. oder own lingo asey. akhon eyta technical terms ey bujhai kemney i dunno.
lolz any neuroscience major here? hehe.
tc.