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Brain Pathways Process the Start and End of What We Hear
The team has isolated an independent processing channel of synapses inside the brain's auditory cortex that deals specifically with shutting off sound processing at appropriate times. Such regulation is vital for hearing and for understanding speech.
The finding has been reported in the Feb. 11 issue of the journal Neuron.
The discovery goes against a long-held assumption that the signaling of a sound's appearance and its subsequent disappearance are both handled by the same pathway.
The new finding could lead to new, distinctly targeted therapies such as improved hearing devices, said Michael Wehr, a professor of psychology and member of the UO Institute of Neuroscience.
"It looks like there is a whole separate channel that goes all the way from the ear up to the brain that is specialized to process sound offsets," Wehr said. The two channels finally come together in a brain region called the auditory cortex, situated in the temporal lobe.
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