Age differentially modulates the cortical tracking of the lower and higher level linguistic structures during speech comprehension

Cerebral Cortex, Год журнала: 2023, Номер 33(19), С. 10463 - 10474

Опубликована: Авг. 11, 2023

Speech comprehension requires listeners to rapidly parse continuous speech into hierarchically-organized linguistic structures (i.e. syllable, word, phrase, and sentence) entrain the neural activities rhythm of different levels. Aging is accompanied by changes in processing, but it remains unclear how aging affects levels representation. Here, we recorded magnetoencephalography signals older younger groups when subjects actively passively listened which hierarchical sentence were tagged at 4, 2, 1 Hz, respectively. A newly-developed parameterization algorithm was applied separate periodically tracking from aperiodic component. We found enhanced lower-level (word-level) tracking, reduced higher-level (phrasal- sentential-level) offset compared with adults. Furthermore, observed attentional modulation on sentential-level being larger for than ones. Notably, neuro-behavior analyses showed that subjects' behavioral accuracy positively correlated reversely tracking. Overall, these results suggest less flexibility may underpin aging-related decline comprehension.

Язык: Английский

---

Aging impacts basic auditory and timing processing

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Март 27, 2024

Abstract Deterioration in the peripheral and central auditory systems is common older adults often leads to hearing speech comprehension difficulties. Even when remains intact, electrophysiological data of frequently exhibit altered neural responses along pathway, reflected variability phase alignment activity sound onsets. However, it unclear whether these challenges processing aging stem from more fundamental deficits timing processes. Here, we investigated if how individuals encoded temporal regularities isochronous sequences presented at 1.5Hz, they employed adaptive mechanisms anticipation next We recorded EEG young listening simple tone sequences. show that displayed increased amplitudes time-locked sounds, an 1/F slope, but reduced phase-coherence delta theta frequency-bands. These observations suggest a lack repetition-suppression inhibition repeated predictable sounds sequence continuous phase-alignment expected onsets aging. Given deteriorations basic capacities may affect other higher-order cognitive processes (e.g., attention, perception, action), results underscore need for future research examining link between abilities general cognition across lifespan. Highligths Aging (HO) cortical excitability as compared younger (HY); HO’s fully tones were larger variable than HY; HO showed coherence delta- theta-band oscillations during sequence; Altogether, sensory

Язык: Английский

---

Evoked Brain Potentials to Sound Offset in Humans in Conditions of Spatial Masking

Neuroscience and Behavioral Physiology, Год журнала: 2024, Номер 54(2), С. 270 - 279

Опубликована: Фев. 1, 2024

Язык: Английский

---

Minimal background noise enhances neural speech tracking: Evidence of stochastic resonance

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Июнь 24, 2024

Neural activity in auditory cortex tracks the amplitude envelope of continuous speech, but recent work counter-intuitively suggests that neural tracking increases when speech is masked by background noise, despite reduced intelligibility. Noise-related amplification could indicate stochastic resonance - response facilitation through noise supports tracking. However, a comprehensive account sensitivity to and role cognitive investment lacking. In five electroencephalography (EEG) experiments (N=109; box sexes), current study demonstrates generalized enhancement due minimal noise. Results show a) enhanced for at very high SNRs (~30 dB SNR) where highly intelligible; b) this independent attention; c) it generalizes across different stationary maskers, strongest 12-talker babble; d) present headphone free-field listening, suggesting neural-tracking real-life listening. The paints clear picture enhances representation envelope, contributes further highlights non-linearities induced make its use as biological marker processing challenging.

Язык: Английский

---

Complex impact of stimulus envelope on motor synchronization to sound

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Авг. 6, 2024

Abstract The human brain tracks temporal regularities in acoustic signals faithfully. Recent neuroimaging studies have shown complex modulations of synchronized neural activities to the shape stimulus envelopes. How connect responses different envelope shapes with listeners’ perceptual ability synchronize rhythms requires further characterization. Here we examine participants’ motor and sensory synchronization noise stimuli periodic amplitude (AM). We used three that varied sharpness onset. In a synchronous finger-tapping task, show participants more consistently align their taps same phase when listening sharp onsets than those gradual onsets. This effect is replicated suggesting basis for facilitated alignment sharp-onset stimuli. Surprisingly, despite less consistent tap alignments gradual-onset stimuli, are equally effective extracting rate modulation from both they tapped at alongside input. result demonstrates robust tracking periodicity achievable without presence edges or envelope. Our findings assuming distinct processes during sensorimotor synchronization. These may be underpinned by mechanisms whose relative strengths modulated specific dynamics characteristics.

Язык: Английский

---