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As a part of the study of perceptive deafness the experiment is being made with the simulation of the inner ear deafness. The simulation consists of an electronic equipment with a distortion circuit and a normal hearing person as a detector. The conditions for the simulation of the inner ear deafness in this experiment are: 1. the rise of the threshold of hearing, 2. the low articulation score, 3. the presence of recruitment, and 4. the hearing difficulty under noisy circumstances.The experiment was carried out concerning the recruitment phenomenon, and the following comments were made:1. The non-lineality of the input-output intensity as such does not bave much influence upon the articulation score. When the wave form is distorted, the articulation score lowers.2. The recruitment phenomenon is clearly observed when the maximum loudness level is close to that of the normal ear.3. It is suspected that the inner ear impairment is not severe when the recruitment appears at the small loudness level.