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Musical Experience, Sensorineural Auditory Processing, and Reading Subskills in Adults
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Stability and Plasticity of Auditory Brainstem Function Across the Lifespan
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An acoustic gap between the NICU and womb: a potential risk for compromised neuroplasticity of the auditory system in preterm infants
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Bilingualism increases neural response consistency and attentional control: Evidence for sensory and cognitive coupling
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Neural processing of speech in children is influenced by bilingual experience
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An acoustic gap between the NICU and womb: a potential risk for compromised neuroplasticity of the auditory system in preterm infants
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Longitudinal Effects of Group Music Instruction on Literacy Skills in Low-Income Children
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The Impoverished Brain: Disparities in Maternal Education Affect the Neural Response to Sound
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Training to Improve Hearing Speech in Noise: Biological Mechanisms
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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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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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Brainstem Correlates of Speech-in-Noise Perception in Children
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19 |
Stimulus Rate and Subcortical Auditory Processing of Speech
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Abstract:
Many sounds in the environment, including speech, are temporally dynamic. The auditory brainstem is exquisitely sensitive to temporal features of the incoming acoustic stream, and by varying the speed of presentation of these auditory signals it is possible to investigate the precision with which temporal cues are represented at a subcortical level. Therefore, to determine the effects of stimulation rate on the auditory brainstem response (ABR), we recorded evoked responses to both a click and a consonant-vowel speech syllable (/da/) presented at three rates (15.4, 10.9 and 6.9 Hz). We hypothesized that stimulus rate affects the onset to speech-evoked responses to a greater extent than click-evoked responses and that subcomponents of the speech-ABR are distinctively affected. While the click response was invariant with changes in stimulus rate, timing of the onset response to /da/ varied systematically, increasing in peak latency as presentation rate increased. Contrasts between the click- and speech-evoked onset responses likely reflect acoustic differences, where the speech stimulus onset is more gradual, has more delineated spectral information, and is more susceptible to backward masking by the subsequent formant transition. The frequency-following response (FFR) was also rate dependent, with response magnitude of the higher frequencies (>400 Hz), but not the frequencies corresponding to the fundamental frequency, diminishing with increasing rate. The selective impact of rate on high-frequency components of the FFR implicates the involvement of distinct underlying neural mechanisms for high- versus low-frequency components of the response. Furthermore, the different rate sensitivities of the speech-evoked onset response and subcomponents of the FFR support the involvement of different neural streams for these two responses. Taken together, these differential effects of rate on the ABR components likely reflect distinct aspects of auditory function such that varying rate of presentation of complex stimuli may be expected to elicit unique patterns of abnormality, depending on the clinical population.
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Keyword:
Original Paper
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URL: http://www.ncbi.nlm.nih.gov/pubmed/20215743 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2919427 https://doi.org/10.1159/000289572
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