For successful intercultural communication a person should know about the culture of an interlocutor, but maybe even that is not enough. To translate correctly and first of all to understand what your interlocutor is talking about, you should think as him/her. So as we can see the intercultural communication is closely connected with cognitive and mental processes and it is an issue of not only linguistics but also of other disciplines like psychology, sociology, ecology and so on. Nowadays, when the society develops so fast, the science should correspond it. It should possess a number of different techniques of researching and describing different phenomenon of intercultural communication one should have good interdisciplinary knowledge.
One of such interdisciplinary sciences is Psycholinguistics or psychology of language. It is the study of the psychological and neurobiological factors that enable humans to acquire, use, comprehend and produce language.
Maybe one of the first steps in psycholinguistics was the linguistic relativity hypothesis, better known as the Sapir-Whorf hypothesis appeared in the 30s of the last century. Benjamin Lee Whorf formulated it during his lectures. Benjamin Whorf confirmed that language determines mentality and the way of learning. He wrote that "people with different languages percept the world differently, because all things are differently expressed and formulated in their language".The precursor of this theory is Wilhelm von Humboldt, a German philosopher and linguist. One of his most famous quotes is a confirmation of it: "The language of the people is its spirit, and the spirit of the people is its language, and it is difficult to imagine anything more identity." .
This theory also finds support among modern researchers as Frunza Camelia who wrote that a language, it is an extensive system of structures, different from others; within a language a person not only communicates, but also analyzes the nature, in which he creates his way of thinking, and with its help he perceives the world.