4.6 Review

Aging Brain and Hearing: A Mini-Review

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The Association Between Early Age-Related Hearing Loss and Brain β-Amyloid

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Summary: The study examined the association between early age-related hearing loss and brain beta-amyloid, a pathologic hallmark of Alzheimer's disease. Worsening hearing was found to be associated with higher beta-amyloid burden, measured in vivo with PET scans.

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Hearing and dementia: from ears to brain

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Summary: The relationship between hearing impairment and dementia highlights the crucial role of the auditory brain in cognitive function, suggesting potential opportunities for early diagnosis and management strategies. Research emphasizes the importance of auditory cognitive function in neurodegenerative dementias, calling for the development of novel auditory testing methods and early diagnosis strategies.
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Hearing loss and dementia: radiologic and biomolecular basis of their shared characteristics. A systematic review.

Arianna Di Stadio et al.

Summary: Dementia and hearing loss often coexist in elderly individuals, sharing common features such as brain atrophy, gliosis, and white matter hyperintensities (WMHs). Radiological studies have shown that WMHs are associated with difficulties in word understanding in elderly persons with normal hearing thresholds, and the presence of these lesions in brain imaging has been linked to an increased risk of cognitive decline.

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Summary: The rodent hippocampus generates new neurons throughout life, but direct evidence of adult neurogenesis in humans remains elusive. Research indicates that adult hippocampal neurogenesis may persist until the 10th decade of human life, with marked impairments in patients with Alzheimer's disease. Methodological aspects in processing and analyzing postmortem human brain samples may limit the detection of markers of adult hippocampal neurogenesis, highlighting the need for strict controls in human studies.

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Summary: Hearing loss, a heterogeneous disorder, is found to impact grey and white matter in nearly every brain region according to MRI studies. Congenital loss decreases grey matter in frontal lobe most, while acquired loss shows significant decreases in both frontal and insula grey matter. Different impacts on hemispheres are observed between congenital and acquired hearing loss.

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Zahra Jafari et al.

Summary: Extensive evidence supports the association between age-related hearing loss (ARHL) and cognitive decline, with structural MRI studies and cellular evidence demonstrating this link. While a causal relationship is possible, the contribution of shared mechanisms should also be considered.

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Bilateral age-related atrophy in the planum temporale is associated with vowel discrimination difficulty in healthy older adults

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Summary: The study investigated the relationship between age-related brain atrophy and behavioral, as well as electrophysiological markers of vowel perception in healthy younger and older adults with normal pure-tone hearing. Older adults performed worse in vowel discrimination despite having normal pure-tone hearing, with those showing greater age-related cortical atrophy in the left and right planum temporale (PT) exhibiting weaker vowel discrimination. In contrast, younger participants with greater cortical thickness in only the left PT performed weaker in the vowel discrimination task. The study suggests that deficient vowel processing is influenced by both aging-related changes in auditory-related cortices and not solely by pure-tone hearing loss.

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Hearing and dementia: from ears to brain

Jeremy C. S. Johnson et al.

Summary: The association between hearing impairment and dementia poses a significant public health challenge, with potential for earlier diagnosis and prevention. Neurodegenerative pathologies are predicted to target the auditory brain and damage hearing function early. It is important to reconsider the role of auditory cognitive function in dementia and develop new auditory tests for early diagnosis.
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Hearing loss is associated with cortical thinning in cognitively normal older adults

J. Ha et al.

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Dementia prevention, intervention, and care: 2020 report of the Lancet Commission

Gill Livingston et al.

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Perspective How Can Hearing Loss Cause Dementia?

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Association of Poorer Hearing With Longitudinal Change in Cerebral White Matter Microstructure

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Poorer Speech Reception Threshold in Noise Is Associated With Lower Brain Volume in Auditory and Cognitive Processing Regions

Mary Rudner et al.

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Alexander Chern et al.

ALZHEIMER DISEASE & ASSOCIATED DISORDERS (2019)

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Association of Midlife Hearing Impairment With Late-Life Temporal Lobe Volume Loss

Nicole M. Armstrong et al.

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Neural Prediction Errors Distinguish Perception and Misperception of Speech

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White-matter microstructure and hearing acuity in older adults: a population-based cross-sectional DTI study

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Is intracranial volume a suitable proxy for brain reserve?

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Smaller Hippocampal Volume and Degraded Peripheral Hearing Among Japanese Community Dwellers

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FRONTIERS IN AGING NEUROSCIENCE (2018)

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Dementia prevention, intervention, and care

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Hearing Impairment Is Associated with Smaller Brain Volume in Aging

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A novel method of quantifying brain atrophy associated with age-related hearing loss

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Dendritic spines provide cognitive resilience against Alzheimer's disease

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Lifestyle Shapes the Dialogue between Environment, Microglia, and Adult Neurogenesis

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Noise induced hearing loss impairs spatial learning/memory and hippocampal neurogenesis in mice

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SCIENTIFIC REPORTS (2016)

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Hearing loss and dementia - who is listening?

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AGING & MENTAL HEALTH (2014)

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Cognitive reserve in ageing and Alzheimer's disease

Yaakov Stern

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A Multisensory Cortical Network for Understanding Speech in Noise

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