scholarly journals Synaptopathy in the Aging Cochlea: Characterizing Early-Neural Deficits in Auditory Temporal Envelope Processing

2018 ◽  
Vol 38 (32) ◽  
pp. 7108-7119 ◽  
Author(s):  
Aravindakshan Parthasarathy ◽  
Sharon G. Kujawa
Keyword(s):  
Temporal Envelope ◽  
Envelope Processing

Auditory temporal envelope processing in a patient with left-hemisphere damage

Neurocase ◽  
2000 ◽  
Vol 6 (3) ◽  
pp. 231-244 ◽  
Author(s):  
Christian Lorenzi ◽  
Jocelyne Wable ◽  
Christine Moroni ◽  
Christophe Derobert ◽  
Bruno Frachet ◽  
...  
Keyword(s):  
Left Hemisphere ◽  
Temporal Envelope ◽  
Envelope Processing

scholarly journals Neural Generators Underlying Temporal Envelope Processing Show Altered Responses and Hemispheric Asymmetry Across Age

2020 ◽  
Vol 12 ◽  
Author(s):  
Ehsan Darestani Farahani ◽  
Jan Wouters ◽  
Astrid van Wieringen
Keyword(s):  
Older Adults ◽  
Temporal Processing ◽  
Hemispheric Asymmetry ◽  
Phase Locking ◽  
Response Strength ◽  
Speech Understanding ◽  
Temporal Envelope ◽  
Age Related ◽  
Envelope Processing ◽  
Age Related Changes

Speech understanding problems are highly prevalent in the aging population, even when hearing sensitivity is clinically normal. These difficulties are attributed to changes in central temporal processing with age and can potentially be captured by age-related changes in neural generators. The aim of this study is to investigate age-related changes in a wide range of neural generators during temporal processing in middle-aged and older persons with normal audiometric thresholds. A minimum-norm imaging technique is employed to reconstruct cortical and subcortical neural generators of temporal processing for different acoustic modulations. The results indicate that for relatively slow modulations (<50 Hz), the response strength of neural sources is higher in older adults than in younger ones, while the phase-locking does not change. For faster modulations (80 Hz), both the response strength and the phase-locking of neural sources are reduced in older adults compared to younger ones. These age-related changes in temporal envelope processing of slow and fast acoustic modulations are possibly due to loss of functional inhibition, which is accompanied by aging. Both cortical (primary and non-primary) and subcortical neural generators demonstrate similar age-related changes in response strength and phase-locking. Hemispheric asymmetry is also altered in older adults compared to younger ones. Alterations depend on the modulation frequency and side of stimulation. The current findings at source level could have important implications for the understanding of age-related changes in auditory temporal processing and for developing advanced rehabilitation strategies to address speech understanding difficulties in the aging population.

Temporal envelope processing in developmental dyslexics

2000 ◽  
Vol 107 (5) ◽  
pp. 2916-2917 ◽  
Author(s):  
Christian Lorenzi ◽  
Christian Fullgrabe ◽  
Annie Dumont
Keyword(s):  
Temporal Envelope ◽  
Envelope Processing

scholarly journals Effects of age and hearing loss on perceptual and physiological measures of temporal envelope processing and spatial release from speech-on-speech masking

2020 ◽  
Author(s):  
Chhayakanta Patro ◽  
Heather A. Kreft ◽  
Magdalena Wojtczak
Keyword(s):  
Hearing Loss ◽  
Amplitude Modulation ◽  
Gap Detection ◽  
Physiological Measures ◽  
Detection Thresholds ◽  
Temporal Envelope ◽  
Hearing Thresholds ◽  
Spatial Release ◽  
Envelope Processing ◽  
Release From Masking

AbstractOlder adults often experience difficulties understanding speech in adverse listening conditions. These difficulties are partially attributed to auditory temporal-processing deficits associated with aging even in the absence of hearing loss. The aim of this study was to assess effects of age and hearing loss on temporal envelope processing and speech-on-speech masking. Listeners with normal and near-normal hearing across a wide age range (20 to 66 years) were tested using a series of psychophysical (amplitude-modulation detection, gap detection, and interaural-envelope-phase discrimination), physiological (electroencephalographic envelope-following responses), speech perception (spatial release from masking), and cognitive (processing speed) measures. Results showed that: (i) psychophysical measures of monaural and binaural envelope processing and neural measures of envelope processing are not affected by aging after accounting for audiometric hearing loss, (ii) behavioral gap-detection thresholds decline with age, (iii) aging results in a reduction of spatial release from masking, even as speech intensity is amplified in the region of hearing loss, (iv) aging is associated with poorer measures of cognitive function. Although age significantly contributed to a decline in spatial release from speech-on-speech masking, individual differences in envelope processing and in scores from nonauditory cognitive tests used in this study were not significant predictors of speech performance.HighlightsAge per se does not affect psychophysical and physiological measures of monaural amplitude-modulation processing.Age does not affect the ability to detect interaural disparities in envelope timing between the ears.Gap detection thresholds degrades with age even after hearing thresholds are statistically accounted for.Age, independent of hearing thresholds, can substantially reduce spatial release from masking.Cognitive ability declines with age. However, such declines do not necessarily cause deficits in spatial release from masking.

scholarly journals Effects of Task Demands on Neural Correlates of Acoustic and Semantic Processing in Challenging Listening Conditions

2021 ◽  
Author(s):  
Dhatri S. Devaraju ◽  
Amy Kemp ◽  
David A. Eddins ◽  
Rahul Shrivastav ◽  
Bharath Chandrasekaran ◽  
...  
Keyword(s):  
Task Difficulty ◽  
Semantic Processing ◽  
Neural Correlates ◽  
Task Demands ◽  
Neural Mechanisms ◽  
Acoustic Properties ◽  
Lower Probability ◽  
Temporal Envelope ◽  
Envelope Processing ◽  
Listening Strategies

AbstractPurposeListeners shift their listening strategies to prioritize lower-level acoustic information and higher-level semantic information in challenging listening conditions. However, the neural mechanisms underlying different strategies are unclear. The current study examined the extent to which encoding of lower-level acoustic cues is modulated by task demand and relationships with the higher-level semantic processing.MethodElectroencephalography (EEG) was acquired while participants listened to sentences in noise that contained either higher or lower probability final words. Task difficulty was modulated by time available to process responses. Cortical tracking of speech - neural correlates of acoustic temporal envelope processing - were estimated using temporal response functions (TRFs).ResultsTask difficulty did not affect cortical tracking of temporal envelope of speech under challenging listening conditions. No correlations were observed between the cortical tracking of temporal envelope of speech and semantic processes, even after controlling for the effect of individualized signal-to-noise ratios.ConclusionsCortical tracking of temporal envelope of speech and semantic processing are differentially influenced by task difficulty. While increased task demands modulated higher-level semantic processing, cortical tracking of temporal envelope of speech may be influenced by task difficulty primarily when the demand is manipulated in terms of acoustic properties of the stimulus, consistent with an emerging perspective in speech perception.

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