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posted by janrinok on Thursday October 20 2016, @01:25AM   Printer-friendly
from the what? dept.

"Could you repeat that?" The reason you may have to say something twice when talking to older family members at Thanksgiving dinner may not be because of their hearing. Researchers at the University of Maryland have determined that something is going on in the brains of typical older adults that causes them to struggle to follow speech amidst background noise, even when their hearing would be considered normal on a clinical assessment.

In an interdisciplinary study published by the Journal of Neurophysiology, researchers Samira Anderson, Jonathan Z. Simon, and Alessandro Presacco found that adults aged 61-73 with normal hearing scored significantly worse on speech understanding in noisy environments than adults aged 18-30 with normal hearing. The researchers are all associated with the UMD's Brain and Behavior Initiative.
...
Why is this the case? "Part of the comprehension problems experienced by older adults in both quiet and noise conditions could be linked to age-related imbalance between excitatory and inhibitory neural processes in the brain," Presacco said. "This imbalance could impair the brain's ability to correctly process auditory stimuli and could be the main cause of the abnormally high cortical response observed in our study."

In short, they think signal processing is to blame, not signal transmission.


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  • (Score: 1) by UltraDark on Thursday October 20 2016, @09:34PM

    by UltraDark (6361) on Thursday October 20 2016, @09:34PM (#416950)

    This sounds like you can't hear high frequencies very well as they convey the consonant sounds (vowel sounds are lower pitch). Top frequencies are the first to go as you get older.