A new approach of sound waves named quantum sound waves theory (QSWT) is presented in this paper. Similar to photons, the quantum particles of light, we consider that sound waves are a flux of quantum particles referred to as sonons. Each sonon transport quantum energy equals to hsn with n the frequency of the sound wave and hs the quantum sonon constant estimated at 5.842 487 81´10-28 J×s. compared with the Planck’s constant h = 6.63´10-34 J×s. In the framework of the QSWT, we describe the brain as a quantized biological matter characterized by cervellonic levels. Transitions between these levels by cervellons (cervellonic particles) make it possible to understand the treatment of information by the brain during a teaching-learning sequence in a class room.