Prague SchoolVersion en ligne Questios! par Ediza Molina 1 Questions. 2 Answers. Prague School practice the notion... Who gives a central role to the phoneme? What´s the therapeutic theory of sound-change? What is the most important aspect of Jakobson´s work? Bloomfield define a phoneme as a... What is contrasted synchronic linguistics? They used the notions ´ phoneme and ´morpheme ´ Nikolai S. Trubetzkoy. Explained as the result of a striving towards a sort of ideal balance or resolution of various conflicting pressures: His phonological theory. As the minimum unit of distinctive sound-feature. Study of a system which the various elements derive their values from their mutual relationships.