In the brain, not the ears
Although tinnitus may begin as an injury to ear cells, it’s accepted science now that the condition has implications beyond the ears to the brain. Josef Rauschecker and his colleagues in the Department of Neuroscience, the Division of Audiology, and the Department of Otolaryngology at Georgetown University have used brain imaging studies to reveal some other scary results: they observed a significant loss of volume in an area located in the frontal lobe of the brain in people with tinnitus.
Researchers at the University of Illinois found that chronic tinnitus is also linked to changes in a region of the brain called the precuneus, part of the parietal lobes that sit near the top of the skull. The precuneus is connected to two inversely related networks in the brain: the “dorsal attention network,” activated by stimulation from incoming sensory information like touch and noise, and the “default mode network,” which operates when the brain is at rest and not occupied by anything in particular.
“When the default mode network is on, the dorsal attention network is off, and vice versa. We found that the precuneus in tinnitus patients seems to be playing a role in that relationship,” said tinnitus researcher Sara Schmidt.
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