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20) Two of these 4 patients were able to increase the loudness of their tinnitus with orofacial movements, and they demonstrated an increase in cerebral blood flow in the left primary auditory cortex and in the medial geniculate nuclei. The researchers used functional magnetic resonance imaging (fMRI) to record cerebral blood flow, an indirect sign of neural activity, as volunteers tried to pick out the faster of two moving gratings shown on a computer screen. Cerebral blood flow, an indication of increased brain activity, was measured while these individuals were at rest, and performed the movements that affected their tinnitus, and while listening to loud beeps or pure tones that were presented using ear phones. |
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