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Auditory Processing Differences in Toddlers With Autism Spectrum Disorder
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In: J Speech Lang Hear Res (2020)
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Distinct Rhythmic Abilities Align With Phonological Awareness And Rapid Naming In School-Age Children
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In: Cogn Process (2020)
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Stable auditory processing underlies phonological awareness in typically developing preschoolers
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In: Brain Lang (2019)
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Hemispheric Asymmetry of Endogenous Neural Oscillations in Young Children: Implications for Hearing Speech In Noise
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Auditory learning through active engagement with sound: biological impact of community music lessons in at-risk children
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Cross-phaseogram: Objective neural index of speech sound differentiation
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Inferior colliculus contributions to phase encoding of stop consonants in an animal model
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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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Context-dependent encoding in the human auditory brainstem relates to hearing speech in noise: Implications for developmental dyslexia
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Subcortical differentiation of stop consonants relates to reading and speech-in-noise perception
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Brainstem transcription of speech is disrupted in children with autism spectrum disorders
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Abnormal cortical processing of the syllable rate of speech in poor readers
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Right-hemisphere auditory cortex is dominant for coding syllable patterns in speech
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Abstract:
Cortical analysis of speech has long been considered the domain of left-hemisphere auditory areas. A recent hypothesis poses that cortical processing of acoustic signals, including speech, is mediated bilaterally based on the component rates inherent to the speech signal. In support of this hypothesis, previous studies have shown that slow temporal features (3–5 Hz) in non-speech acoustic signals lateralize to right-hemisphere auditory areas while rapid temporal features (20–50 Hz) lateralize to the left hemisphere. These results were obtained using non-speech stimuli, and it is not known if right-hemisphere auditory cortex is dominant for coding the slow temporal features in speech known as the speech envelope. Here we show strong right-hemisphere dominance for coding the speech envelope, which represents syllable patterns and is critical for normal speech perception. Right-hemisphere auditory cortex was 100% more accurate in following contours of the speech envelope and had 33% larger response magnitude while following the envelope compared to the left-hemisphere. Asymmetries were evident irrespective of the ear of stimulation despite dominance of contralateral connections in ascending auditory pathways. Results provide evidence that the right hemisphere plays a specific and important role in speech processing and support the hypothesis that acoustic processing of speech involves the decomposition of the signal into constituent temporal features by rate-specialized neurons in right- and left-hemisphere auditory cortex.
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Keyword:
Article
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URL: http://www.ncbi.nlm.nih.gov/pubmed/18400895 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2713056 https://doi.org/10.1523/JNEUROSCI.0187-08.2008
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