scholarly journals Mechanisms of spectrotemporal modulation detection for normal- and hearing-impaired listeners

2020 ◽  
Author(s):  
Emmanuel Ponsot ◽  
Léo Varnet ◽  
Nicolas Wallaert ◽  
Elza Daoud ◽  
Shihab A. Shamma ◽  
...  
Keyword(s):  
Auditory Processing ◽  
Filter Bank ◽  
Hearing Impaired ◽  
Temporal Modulation ◽  
Unified Framework ◽  
Cochlear Hearing Loss ◽  
Band Pass ◽  
Modulation Filtering ◽  
Modulation Filter ◽  
Processing Architecture

AbstractSpectrotemporal modulations (STMs) offer a unified framework to probe suprathreshold auditory processing. Here, we introduce a novel methodological framework based on psychophysical reverse-correlation deployed in the modulation space to characterize how STMs are detected by the auditory system and how cochlear hearing loss impacts this processing. Our results show that young normal-hearing (NH) and older hearing-impaired (HI) individuals rely on a comparable non-linear processing architecture involving non-directional band-pass modulation filtering. We demonstrate that a temporal-modulation filter-bank model can capture the strategy of the NH group and that a broader tuning of cochlear filters is sufficient to explain the overall shift toward temporal modulations of the HI group. Yet, idiosyncratic behaviors exposed within each group highlight the contribution and the need to consider additional mechanisms. This integrated experimental-computational approach offers a principled way to assess supra-threshold auditory processing distortions of each individual.

scholarly journals Mechanisms of Spectrotemporal Modulation Detection for Normal- and Hearing-Impaired Listeners

2021 ◽  
Vol 25 ◽  
pp. 233121652097802
Author(s):  
Emmanuel Ponsot ◽  
Léo Varnet ◽  
Nicolas Wallaert ◽  
Elza Daoud ◽  
Shihab A. Shamma ◽  
...  
Keyword(s):  
Speech Intelligibility ◽  
Hearing Impaired ◽  
Temporal Modulation ◽  
Computational Tools ◽  
Cochlear Tuning ◽  
Cochlear Hearing Loss ◽  
Nonlinear Processing ◽  
Linear Band ◽  
Band Pass ◽  
Modulation Filter

Spectrotemporal modulations (STM) are essential features of speech signals that make them intelligible. While their encoding has been widely investigated in neurophysiology, we still lack a full understanding of how STMs are processed at the behavioral level and how cochlear hearing loss impacts this processing. Here, we introduce a novel methodological framework based on psychophysical reverse correlation deployed in the modulation space to characterize the mechanisms underlying STM detection in noise. We derive perceptual filters for young normal-hearing and older hearing-impaired individuals performing a detection task of an elementary target STM (a given product of temporal and spectral modulations) embedded in other masking STMs. Analyzed with computational tools, our data show that both groups rely on a comparable linear (band-pass)–nonlinear processing cascade, which can be well accounted for by a temporal modulation filter bank model combined with cross-correlation against the target representation. Our results also suggest that the modulation mistuning observed for the hearing-impaired group results primarily from broader cochlear filters. Yet, we find idiosyncratic behaviors that cannot be captured by cochlear tuning alone, highlighting the need to consider variability originating from additional mechanisms. Overall, this integrated experimental-computational approach offers a principled way to assess suprathreshold processing distortions in each individual and could thus be used to further investigate interindividual differences in speech intelligibility.

scholarly journals Sensitivity to Interaural Phase in Older Hearing-Impaired Listeners Correlates With Nonauditory Trail Making Scores and With a Spatial Auditory Task of Unrelated Peripheral Origin

2019 ◽  
Vol 23 ◽  
pp. 233121651986449 ◽  
Author(s):  
Olaf Strelcyk ◽  
Pavel Zahorik ◽  
James Shehorn ◽  
Chhayakanta Patro ◽  
Ralph Peter Derleth
Keyword(s):  
Auditory Processing ◽  
Discrimination Performance ◽  
Hearing Impaired ◽  
Auditory Task ◽  
Cognitive Test ◽  
Interaural Level Difference ◽  
Strong Correlations ◽  
Performance Improvements ◽  
Interaural Phase ◽  
Trail Making

Interaural phase difference (IPD) discrimination upper frequency limits and just-noticeable differences (JNDs), interaural level difference (ILD) JNDs, and diotic intensity JNDs were measured for 20 older hearing-impaired listeners with matched moderate sloping to severe sensorineural hearing losses. The JNDs were measured using tone stimuli at 500 Hz. In addition to these auditory tests, the participants completed a cognitive test (Trail Making Test). Significant performance improvements in IPD discrimination were observed across test sessions. Strong correlations were found between IPD and ILD discrimination performance. Very strong correlations were observed between IPD discrimination and Trail Making performance as well as strong correlations between ILD discrimination and Trail Making performance. These relationships indicate that interindividual variability in IPD discrimination performance did not exclusively reflect deficits specific to any auditory processing, including early auditory processing of temporal information. The observed relationships between spatial audition and cognition may instead be attributable to a modality-general spatial processing deficit and/or individual differences in global processing speed.

Pole-shared linear-phase band-pass filter bank

1966 ◽  
Vol 54 (4) ◽  
pp. 701-703 ◽  
Author(s):  
P.R. Drouilhet ◽  
L.M. Goodman
Keyword(s):  
Filter Bank ◽  
Band Pass Filter ◽  
Linear Phase ◽  
Pass Filter ◽  
Band Pass
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