How Hearing Loss Affects Cognitive Function
We “hear” with our brain, not with our ears. When we have a hearing loss, the connections in the brain that respond to sound become reorganized.
Fortunately, for many people, hearing aids can provide the sound stimulation needed for the brain to restore the normal organization of connections to its “sound center” so it can more readily react to the sounds that it had been missing and cognitively process them.
Brandeis University Professor of Neuroscience, Dr. Arthur Wingfield, has been studying cognitive aging and the relationship between memory and hearing acuity. He says unaddressed hearing loss not only affects the listener’s ability to “hear” the sound accurately, but it also affects higher-level cognitive function. Specifically, it interferes with the listener’s ability to accurately process the auditory information and make sense of it.
In one study, Wingfield and his co-investigators found that older adults with mild-to-moderate hearing loss performed poorer on cognitive tests than those of the same age who had good hearing.
Wingfield and colleagues at the University of Pennsylvania and Washington University in St. Louis also used MRI to look at the effect that hearing loss has on both brain activity and structure. The study found that people with poorer hearing had less gray matter in the auditory cortex, a region of the brain that is necessary to support speech comprehension.
Wingfield has suggested the possibility that the participants’ hearing loss had a causal role. He and his co-investigators hypothesize that when the sensory stimulation is reduced due to hearing loss, corresponding areas of the brain reorganize their activity as a result.
“The sharpness of an individual’s hearing has cascading consequences for various aspects of cognitive function,” said Wingfield. “We’re only just beginning to understand how far-reaching these consequences are.”
“Even if you have just a mild hearing loss that is not being treated, cognitive load increases significantly,” Wingfield continued. “You have to put in so much effort just to perceive and understand what is being said that you divert resources away from storing what you have heard into your memory.”
As people move through middle age and their later years, Wingfield suggested, it is reasonable for them to get their hearing tested annually. If there is a hearing loss, it is best to take it seriously and treat it.
Don’t let your hearing mess with your head! If you or a loved one are suffering from hearing loss, call your community hearing experts at Nola Aronson’s Advanced Audiology, 661-250-6904. For the month of September, we will be donating 10 percent of all hearing aid sales to the 2016 Walk to End Alzheimer’s.
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