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Abstract: The cochlear implant produces a “chaos of sound” where sounds and meanings are dissociated. This experience is similar to a dissociative state which jeopardize the solidity of the personality structure. Based upon a various clinical cases, our research shows that the medical technique of cochlear implant can produce a real amelioration in the case of a depressed patient. Meanwhile, the other result of our research is that there is a gap between the metallic recovered voice of postimplant and the expected one. This gape may activate mental breakdown phenomenon related to mourning. We had been able to produce another data related to the loss of impaired hearing status. Since a disability can contribute to build one''s ego, the loss of this disability contribute to the loss of this “surrogate” ego. Our research conclude therefore that in one hand there is a remarkable variety of cochlear implant effects upon neurotic person and on the other hand that psychotic structure, though already recognized or predictable without necessary being diagnosed, must be handled carefully since there is a high risk of both the irruption or aggravation of the psychotic state. [Copyright &y& Elsevier]