Language and thinking are deeply interconnected, having mutual influence and development. According to some linguistic theories, there is no language without thinking, and there is no thinking without language. Psycholinguistics is indeed an important branch of linguistics, which highlights the role of psychological states in one's thoughts and communication. It explores both mental and linguistic processes that take place in the human brain when thoughts are formed, and speech is produced or received. To sum up, language is an integral, undividable part of thinking, and thoughts cannot be shaped without language.

If I take sign language and thought, signers are not usually witnessed to sign to themeselves while thinking. I am not saying that sign language is not language, but I am saying that in this particular case thought seems to dispense with language.