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Training to Improve Hearing Speech in Noise: Biological Mechanisms
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Musicians have fine-tuned neural distinction of speech syllables
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Aging affects neural precision of speech encoding
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Abstract:
Older adults frequently report they can hear what is said but cannot understand the meaning, especially in noise. This difficulty may arise from the inability to process rapidly changing elements of speech. Aging is accompanied by a general slowing of neural processing and decreased neural inhibition, both of which likely interfere with temporal processing in auditory and other sensory domains. Age-related reductions in inhibitory neurotransmitter levels and delayed neural recovery can contribute to decreases in the auditory system’s temporal precision. Decreased precision may lead to neural timing delays, reductions in neural response magnitude, and a disadvantage in processing the rapid acoustic changes in speech. The auditory brainstem response (ABR), a scalp-recorded electrical potential, is known for its ability to capture precise neural synchrony within subcortical auditory nuclei; therefore, we hypothesized that a loss of temporal precision results in subcortical timing delays and decreases in response consistency and magnitude. To assess this hypothesis, we recorded ABRs to the speech syllable /da/ in normal hearing younger (ages 18 to 30) and older adult humans (60 to 67). Older adults had delayed ABRs, especially in response to the rapidly changing formant transition, and greater response variability. We also found that older adults had decreased phase locking and smaller response magnitudes than younger adults. Taken together, our results support the theory that older adults have a loss of temporal precision in subcortical encoding of sound, which may account, at least in part, for their difficulties with speech perception.
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Article
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URL: https://doi.org/10.1523/JNEUROSCI.2176-12.2012 http://www.ncbi.nlm.nih.gov/pubmed/23055485 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3488287
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44 |
Training to Improve Hearing Speech in Noise: Biological Mechanisms
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Subcortical encoding of sound is enhanced in bilinguals and relates to executive function advantages
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Assistive listening devices drive neuroplasticity in children with dyslexia
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Cross-phaseogram: Objective neural index of speech sound differentiation
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Training to Improve Hearing Speech in Noise: Biological Mechanisms
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Musical Experience and the Aging Auditory System: Implications for Cognitive Abilities and Hearing Speech in Noise
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Inferior colliculus contributions to phase encoding of stop consonants in an animal model
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Brainstem Correlates of Speech-in-Noise Perception in Children
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RAPID ACOUSTIC PROCESSING IN THE AUDITORY BRAINSTEM IS NOT RELATED TO CORTICAL ASYMMETRY FOR THE SYLLABLE RATE OF SPEECH
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Stimulus Rate and Subcortical Auditory Processing of Speech
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Auditory brainstem measures predict reading and speech-in-noise perception in school-aged children
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Musical Experience Limits the Degradative Effects of Background Noise on the Neural Processing of Sound
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Context-dependent encoding in the human auditory brainstem relates to hearing speech in noise: Implications for developmental dyslexia
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