Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state
Experimental evidence in animals demonstrates cortical neurons innervate subcortex bilaterally to tune brainstem auditory coding. Yet, the role of the descending (corticofugal) auditory system in modulating earlier sound processing in humans during speech perception remains unclear. Here, we measure...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | NeuroImage |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S105381192200742X |
| _version_ | 1811325910281879552 |
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| author | Jesyin Lai Caitlin N. Price Gavin M. Bidelman |
| author_facet | Jesyin Lai Caitlin N. Price Gavin M. Bidelman |
| author_sort | Jesyin Lai |
| collection | DOAJ |
| description | Experimental evidence in animals demonstrates cortical neurons innervate subcortex bilaterally to tune brainstem auditory coding. Yet, the role of the descending (corticofugal) auditory system in modulating earlier sound processing in humans during speech perception remains unclear. Here, we measured EEG activity as listeners performed speech identification tasks in different noise backgrounds designed to tax perceptual and attentional processing. We hypothesized brainstem speech coding might be tied to attention and arousal states (indexed by cortical α power) that actively modulate the interplay of brainstem-cortical signal processing. When speech-evoked brainstem frequency-following responses (FFRs) were categorized according to cortical α states, we found low α FFRs in noise were weaker, correlated positively with behavioral response times, and were more ”decodable” via neural classifiers. Our data provide new evidence for online corticofugal interplay in humans and establish that brainstem sensory representations are continuously yoked to (i.e., modulated by) the ebb and flow of cortical states to dynamically update perceptual processing. |
| first_indexed | 2024-04-13T14:41:33Z |
| format | Article |
| id | doaj.art-88dae92df415410e986e65855419f04a |
| institution | Directory Open Access Journal |
| issn | 1095-9572 |
| language | English |
| last_indexed | 2024-04-13T14:41:33Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | NeuroImage |
| spelling | doaj.art-88dae92df415410e986e65855419f04a2022-12-22T02:42:53ZengElsevierNeuroImage1095-95722022-11-01263119627Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α stateJesyin Lai0Caitlin N. Price1Gavin M. Bidelman2Institute for Intelligent Systems, University of Memphis, Memphis, TN, USA; School of Communication Sciences and Disorders, University of Memphis, Memphis, TN, USA; Diagnostic Imaging Department, St. Jude Children’s Research Hospital, Memphis, TN, USAInstitute for Intelligent Systems, University of Memphis, Memphis, TN, USA; School of Communication Sciences and Disorders, University of Memphis, Memphis, TN, USA; Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences, Little Rock, AR, USAInstitute for Intelligent Systems, University of Memphis, Memphis, TN, USA; School of Communication Sciences and Disorders, University of Memphis, Memphis, TN, USA; Department of Speech, Language and Hearing Sciences, Indiana University, 2631 East Discovery Parkway, Bloomington, IN 47408, USA; Program in Neuroscience, Indiana University, 1101 E 10th St, Bloomington, IN 47405, USA; Corresponding author at: Department of Speech, Language and Hearing Sciences, Indiana University, Bloomington, IN, 47408, USA.Experimental evidence in animals demonstrates cortical neurons innervate subcortex bilaterally to tune brainstem auditory coding. Yet, the role of the descending (corticofugal) auditory system in modulating earlier sound processing in humans during speech perception remains unclear. Here, we measured EEG activity as listeners performed speech identification tasks in different noise backgrounds designed to tax perceptual and attentional processing. We hypothesized brainstem speech coding might be tied to attention and arousal states (indexed by cortical α power) that actively modulate the interplay of brainstem-cortical signal processing. When speech-evoked brainstem frequency-following responses (FFRs) were categorized according to cortical α states, we found low α FFRs in noise were weaker, correlated positively with behavioral response times, and were more ”decodable” via neural classifiers. Our data provide new evidence for online corticofugal interplay in humans and establish that brainstem sensory representations are continuously yoked to (i.e., modulated by) the ebb and flow of cortical states to dynamically update perceptual processing.http://www.sciencedirect.com/science/article/pii/S105381192200742XEEGCortical αFrequency-following responsesAttention and arousal |
| spellingShingle | Jesyin Lai Caitlin N. Price Gavin M. Bidelman Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state NeuroImage EEG Cortical α Frequency-following responses Attention and arousal |
| title | Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| title_full | Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| title_fullStr | Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| title_full_unstemmed | Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| title_short | Brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| title_sort | brainstem speech encoding is dynamically shaped online by fluctuations in cortical α state |
| topic | EEG Cortical α Frequency-following responses Attention and arousal |
| url | http://www.sciencedirect.com/science/article/pii/S105381192200742X |
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