More than words: Neurophysiological correlates of semantic dissimilarity depend on comprehension of the speech narrative

European Journal of Neuroscience, Год журнала: 2022, Номер 56(8), С. 5201 - 5214

Опубликована: Авг. 22, 2022

Abstract Speech comprehension relies on the ability to understand words within a coherent context. Recent studies have attempted obtain electrophysiological indices of this process by modelling how brain activity is affected word's semantic dissimilarity preceding words. Although resulting appear robust and are strongly modulated attention, it remains possible that, rather than capturing contextual understanding words, they may actually reflect word‐to‐word changes in content without need for narrative‐level part listener. To test this, we recorded electroencephalography from subjects who listened speech presented either its original, narrative form, or after scrambling word order varying amounts. This manipulation comprehend but not recognise individual Neural low‐level acoustic processing were derived each condition using temporal response function. Signatures observed when was unscrambled minimally scrambled understood speech. The same markers absent higher levels as dropped. In contrast, recognition remained high neural measures related envelope tracking did vary significantly across conditions. supports previous claim that based their context listener's those relative It also highlights insensitivity comprehension.

Язык: Английский

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Neural envelope tracking predicts speech intelligibility and hearing aid benefit in children with hearing loss

Hearing Research, Год журнала: 2023, Номер 439, С. 108893 - 108893

Опубликована: Окт. 4, 2023

Язык: Английский

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Speech onsets and sustained speech contribute differentially to delta and theta speech tracking in auditory cortex

Cerebral Cortex, Год журнала: 2023, Номер 33(10), С. 6273 - 6281

Опубликована: Янв. 10, 2023

Abstract When we attentively listen to an individual’s speech, our brain activity dynamically aligns the incoming acoustic input at multiple timescales. Although this systematic alignment between ongoing and speech in auditory areas is well established, events that drive phase-locking are not fully understood. Here, use magnetoencephalographic recordings of 24 human participants (12 females) while they were listening a 1 h story. We show whereas speech–brain coupling associated with sustained fluctuations envelope theta-frequency range (4–7 Hz), tracking low-frequency delta (below Hz) was strongest around onsets like beginning sentence. Crucially, bilateral after onsets, proposing during continuous perception driven by onsets. conclude both components contribute differentially delta- bands, orchestrating sampling speech. Thus, results suggest temporal dissociation acoustically oscillatory tracking, providing valuable implications for orchestration time scales.

Язык: Английский

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The Early Subcortical Response at the Fundamental Frequency of Speech Is Temporally Separated from Later Cortical Contributions

Journal of Cognitive Neuroscience, Год журнала: 2024, Номер 36(3), С. 475 - 491

Опубликована: Янв. 1, 2024

Abstract Most parts of speech are voiced, exhibiting a degree periodicity with fundamental frequency and many higher harmonics. Some neural populations respond to this temporal fine structure, in particular at the frequency. This frequency-following response consists both subcortical cortical contributions can be measured through EEG as well magnetoencephalography (MEG), although differ aspects activity that they capture: is sensitive radial tangential sources deep sources, whereas MEG more restrained measurement superficial activity. responses continuous have shown an early contribution, latency around 9 msec, agreement measurements short tokens, not yet revealed such component. Here, we analyze long segments speech. We find latencies 4–11 followed by later right-lateralized activities delays 20–58 msec potential activities. Our results show component FFR from participants its agrees EEG. They furthermore temporally separated contributions, enabling independent assessment components toward further processing.

Язык: Английский

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Neural tracking measures of speech intelligibility: Manipulating intelligibility while keeping acoustics unchanged

Proceedings of the National Academy of Sciences, Год журнала: 2023, Номер 120(49)

Опубликована: Ноя. 30, 2023

Neural speech tracking has advanced our understanding of how brains rapidly map an acoustic signal onto linguistic representations and ultimately meaning. It remains unclear, however, intelligibility is related to the corresponding neural responses. Many studies addressing this question vary level by manipulating waveform, but makes it difficult cleanly disentangle effects from underlying acoustical confounds. Here, using magnetoencephalography recordings, we study measures while keeping acoustics strictly unchanged. Acoustically identical degraded stimuli (three-band noise-vocoded, ~20 s duration) are presented twice, second presentation preceded original (nondegraded) version speech. This intermediate priming, which generates a "pop-out" percept, substantially improves passage. We investigate structure affect multivariate temporal response functions (mTRFs). As expected, behavioral results confirm that perceived clarity improved priming. mTRFs analysis reveals auditory (speech envelope onset) not affected priming only (bottom-up driven). Critically, findings suggest segmentation sounds into words emerges with better intelligibility, most strongly at later (~400 ms latency) word processing stage, in prefrontal cortex, line engagement top-down mechanisms associated Taken together, show may provide some objective comprehension.

Язык: Английский

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The neural response at the fundamental frequency of speech is modulated by word-level acoustic and linguistic information

Frontiers in Neuroscience, Год журнала: 2022, Номер 16

Опубликована: Июль 22, 2022

Spoken language comprehension requires rapid and continuous integration of information, from lower-level acoustic to higher-level linguistic features. Much this processing occurs in the cerebral cortex. Its neural activity exhibits, for instance, correlates predictive processing, emerging at delays a few 100 ms. However, auditory pathways are also characterized by extensive feedback loops cortical areas ones as well subcortical structures. Early can therefore be influenced cognitive processes, but it remains unclear whether such contributes processing. Here, we investigated early speech-evoked that emerges fundamental frequency. We analyzed EEG recordings obtained when subjects listened story read single speaker. identified response tracking speaker's frequency occurred delay 11 ms, while another elicited high-frequency modulation envelope higher harmonics exhibited larger magnitude longer latency about 18 ms with an additional significant component around 40 Notably, earlier components likely originate structures, latter presumably involves contributions regions. Subsequently, determined these responses each individual word story. then quantified context-independent used model compute context-dependent surprisal precision. The represented how predictable is, given previous context, precision reflected confidence predicting next past context. found word-level were predominantly features: average its variability. Amongst features, only showed weak modulation. Our results show is already suggesting top-down response.

Язык: Английский

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Sustained responses and neural synchronization to amplitude and frequency modulation in sound change with age

Hearing Research, Год журнала: 2022, Номер 428, С. 108677 - 108677

Опубликована: Дек. 17, 2022

Язык: Английский

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Algorithms for Estimating Time-Locked Neural Response Components in Cortical Processing of Continuous Speech

IEEE Transactions on Biomedical Engineering, Год журнала: 2022, Номер 70(1), С. 88 - 96

Опубликована: Июнь 21, 2022

The Temporal Response Function (TRF) is a linear model of neural activity time-locked to continuous stimuli, including speech. TRFs based on speech envelopes typically have distinct components that provided remarkable insights into the cortical processing However, current methods may lead less than reliable estimates single-subject TRF components. Here, we compare two established methods, in component estimation, and also propose novel algorithms utilize prior knowledge these components, bypassing full estimation.

Язык: Английский

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Delta-band neural envelope tracking predicts speech intelligibility in noise in preschoolers

Hearing Research, Год журнала: 2023, Номер 434, С. 108785 - 108785

Опубликована: Май 7, 2023

Язык: Английский

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Heard or Understood? Neural Tracking of Language Features in a Comprehensible Story, an Incomprehensible Story and a Word List

eNeuro, Год журнала: 2023, Номер 10(7), С. ENEURO.0075 - 23.2023

Опубликована: Июль 1, 2023

Speech comprehension is a complex neural process on which relies activation and integration of multiple brain regions. In the current study, we evaluated whether speech can be investigated by tracking. Neural tracking phenomenon in responses time-lock to rhythm specific features continuous speech. These acoustic, i.e., acoustic tracking, or derived from content using language properties, We differs between comprehensible story, an incomprehensible word list. 19 participants (six men). No significant difference regarding was found. However, only found for story. The most prominent effect visible surprisal, feature at level. response surprisal showed negativity 300 400 ms, similar N400 evoked paradigms. This significantly more negative when story comprehended, words could integrated context previous words. results show that capture comprehension.

Язык: Английский

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