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Deep Neural Network Model of Hearing-Impaired Speech-in-Noise Performance
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In: Frontiers (2020)
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Deep Neural Network Model of Hearing-Impaired Speech-in-Noise Perception
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In: Front Neurosci (2020)
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Modeling the Effect of Olivocochlear Efferents on the Subcortical Envelope Following Response in Humans
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Modeling the Time-Varying and Level-Dependent Effects of the Medial Olivocochlear Reflex in Auditory Nerve Responses
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Functional ear (a)symmetry in brainstem neural activity relevant to encoding of voice pitch: A precursor for hemispheric specialization?
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Abstract:
Pitch processing is lateralized to the right hemisphere; linguistic pitch is further mediated by left cortical areas. This experiment investigates whether ear asymmetries vary in brainstem representation of pitch depending on linguistic status. Brainstem frequency-following responses (FFRs) were elicited by monaural stimulation of the left and right ear of 15 native speakers of Mandarin Chinese using two synthetic speech stimuli that differ in linguistic status of tone. One represented a native lexical tone (Tone 2: T2); the other, T2', a nonnative variant in which the pitch contour was a mirror image of T2 with the same starting and ending frequencies. Two 40-ms portions of f0 contours were selected in order to compare two regions (R1, early; R2 late) differing in pitch acceleration rate and perceptual saliency. In R2, linguistic status effects revealed that T2 exhibited a larger degree of FFR rightward ear asymmetry as reflected in f0 amplitude relative to T2'. Relative to midline (ear asymmetry = 0), the only ear asymmetry reaching significance was that favoring left ear stimulation elicited by T2'. By left- and right-ear stimulation separately, FFRs elicited by T2 were larger than T2' in the right ear only. Within T2', FFRs elicited by the earlier region were larger than the later in both ears. Within T2, no significant differences in FFRS were observed between regions in either ear. Collectively, these findings support the idea that origins of cortical processing preferences for perceptually-salient portions of pitch are rooted in early, preattentive stages of processing in the brainstem.
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Article
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URL: https://doi.org/10.1016/j.bandl.2011.05.001
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3193894
http://www.ncbi.nlm.nih.gov/pubmed/21658753
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Linguistic status of timbre influences pitch encoding in the brainstem
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Language-dependent pitch encoding advantage in the brainstem is not limited to acceleration rates that occur in natural speech
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