 These tests, taken together, evaluate both the functionality of the peripheral hearing apparatus and the cortical integration of peripheral signals. Considered parameters are the comprehension of the verbal message 100 represents full understanding and the sound intensity level at which comprehension is maximal, expressed in decibels hearing level dB HL. Another parameter studied during speech audiometry testing is the percent reduction of disyllabic words understood as the sound intensity increases. This phenomenon, the reduction of understood disyllabic words with increasing sound intensity, is due to pathologic distortion of cochlear and retro cochlear structures VIII cranial nerve. 