As Bleuler (1925) pointed out, all our relationships with our human environment are regulated through language. For this, auditory perception is essential, this can only take place if the peripheral auditory mechanism (viz., the tympanic membrane, ossicles, spiral ganglion of Corti and VIIIth nerve) is not diseased. When a person becomes deaf through disease of any of the latter, it does not matter which one of the peripheral mechanisms is involved, the result is always the same. Often not knowing what his fellow men are saying he becomes doubtful about them: losing auditory contact with them he has to rely on an inner world of auditory memories and images; he misinterprets auditory sense impressions which have been distorted by disease, and incorporates tinnitus caused by such disease into his world of inner phantasy. He projects his inner feelings of inferiority caused by his deafness on to his environment and develops ideas of reference. Systematization soon follows, with active delusions of persecution. If the personality is sufficiently unstable a psychotic illness results.