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Scientists studying tinnitus have made a discovery in animal models that they believe shows that the hearing disorder occurs due to overactive neurons. A team of researchers from the University of Michigan Medical School induced tinnitus in guinea pigs, Medical News Today reports. Their findings, published in the Journal of Neuroscience, suggest that tinnitus occurs after alteration of a process in animals known as stimulus-timing dependent multisensory plasticity. They claim that this plasticity is incredibly sensitive to the timing of signals going to an important part of the brain.