Due to the nature of its object different types of linguistic knowledge seem to range from natural sciences to philosophy. And how does psychology enter this picture? In the article we bring into focus some basic epistemological loops of the linguistic field and try to describe traditional approaches to language from the perspective of epistemological relativism. In detail we deal with the neuropsychological approach, since it represents the newest off spring of scientific methods in psychology. The general idea of thearticle is that approaches to language should exceed the horizon of reasoning and hypothesising imposed by the visible phenomena. It is argued that this distinction sheds new lights on once leading methods in psychology like behaviourism, and open new ways of psychological research in this field.