Linguistic relativity and language as epiphenomenon: two contradictory positions

The assumption of linguistics relativity and the definition of languages as epiphenomena are certainly known as two contradictory positions from the last century. But I will start my discussion of them in the period of their appearance and then use this as a basis to evaluate the heuristic value of these positions in present day linguistics. I will start with the definition of language as an epiphenomenon and then I will go on with the linguistic relativity. The notion of ʽepiphenomenon’ is usually used to exclude certain aspects of a scientific object because they are considered to be deduced from others. In linguistics, restrictions of the research object were made, invoking the notion of ʽepiphenomenonʼ, which was partially done with a polemical attitude, and was always responded to polemically