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Neural Decoding Reveals Concurrent Phonemic and Subphonemic Representations of Speech Across Tasks
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In: MIT Press (2021)
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Abstract:
Robust and efficient speech perception relies on the interpretation of acoustically variable phoneme realizations, yet prior neuroimaging studies are inconclusive regarding the degree to which subphonemic detail is maintained over time as categorical representations arise. It is also unknown whether this depends on the demands of the listening task. We addressed these questions by using neural decoding to quantify the (dis)similarity of brain response patterns evoked during two different tasks. We recorded magnetoencephalography (MEG) as adult participants heard isolated, randomized tokens from a /ba/-/da/ speech continuum. In the passive task, their attention was diverted. In the active task, they categorized each token as ba or da. We found that linear classifiers successfully decoded ba vs. da perception from the MEG data. Data from the left hemisphere were sufficient to decode the percept early in the trial, while the right hemisphere was necessary but not sufficient for decoding at later time points. We also decoded stimulus representations and found that they were maintained longer in the active task than in the passive task; however, these representations did not pattern more like discrete phonemes when an active categorical response was required. Instead, in both tasks, early phonemic patterns gave way to a representation of stimulus ambiguity that coincided in time with reliable percept decoding. Our results suggest that the categorization process does not require the loss of subphonemic detail, and that the neural representation of isolated speech sounds includes concurrent phonemic and subphonemic information.
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URL: https://hdl.handle.net/1721.1/138245.2
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ERP Mismatch Negativity Amplitude and Asymmetry Reflect Phonological and Rapid Automatized Naming Skills in English-Speaking Kindergartners
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In: Frontiers (2021)
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Multifactorial pathways facilitate resilience among kindergarteners at risk for dyslexia: A longitudinal behavioral and neuroimaging study
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In: PMC (2021)
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Putative protective neural mechanisms in prereaders with a family history of dyslexia who subsequently develop typical reading skills
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In: Wiley (2021)
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Putative protective neural mechanisms in prereaders with a family history of dyslexia who subsequently develop typical reading skills
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In: Wiley (2021)
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Distinct neural substrates of individual differences in components of reading comprehension in adults with or without dyslexia
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In: Elsevier (2021)
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Putative protective neural mechanisms in prereaders with a family history of dyslexia who subsequently develop typical reading skills
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Putative protective neural mechanisms in prereaders with a family history of dyslexia who subsequently develop typical reading skills
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In: Hum Brain Mapp (2020)
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Multifactorial pathways facilitate resilience among kindergarteners at risk for dyslexia: A longitudinal behavioral and neuroimaging study
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In: Dev Sci (2020)
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Longitudinal stability of pre-reading skill profiles of kindergarten children: implications for early screening and theories of reading
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In: PMC (2019)
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Disrupted left fusiform response to print in beginning kindergartners is associated with subsequent reading
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In: Elsevier (2019)
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Emergence of the neural network underlying phonological processing from the prereading to the emergent reading stage: A longitudinal study ...
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Emergence of the neural network underlying phonological processing from the pre-reading to the emergent reading stage: a longitudinal study
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Revisiting the ‘enigma’ of musicians with dyslexia: auditory sequencing and speech abilities
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Revisiting the "Enigma" of musicians with dyslexia: Auditory sequencing and speech abilities
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Enhanced Syllable Discrimination Thresholds in Musicians
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In: PLoS (2013)
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Tracking the Roots of Reading Ability: White Matter Volume and Integrity Correlate with Phonological Awareness in Prereading and Early-Reading Kindergarten Children
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In: PNAS (2013)
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