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Schizophrenia is a psychiatric disorder with the main symptoms of hallucinations and delusions. In particular, auditory hallucinations in which the patient is criticized, ordered, or monitored by others who inflict damage on them are characteristic symptoms of schizophrenia. This leads some to believe that the essence of schizophrenia is a disorder of the ” replication” and the blurring of the boundary between self and others. In other words, it is a pathological feeling that others are directly entering the brain. The neural mechanisms that cause these symptoms are not well understood. What abnormalities in neuronal activity and neural networks occur in auditory hallucinations? To elucidate these questions, my Hakubi project aims to create an animal model of schizophrenia in monkeys, which have a brain similar to that of humans, and to analyze their behavior and brain activity to clarify the neural mechanisms of auditory hallucinations.