On the use of envelope following responses to estimate peripheral level compression in the auditory system

Encina-Llamas, Gerard; Dau, Torsten; Epp, Bastian

doi:10.1038/s41598-021-85850-x

Cited by 11 publications

(6 citation statements)

References 117 publications

(73 reference statements)

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“…2). These results are quite consistent with the findings of Encina-Llamas et al (2021). There, the slope was found to be approximately 0.25 dB/dB at input levels in the 30 to 60 dB SPL range for listeners with normal hearing.…”

Section: Discussionsupporting

confidence: 93%

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Sergeeva,

Bech Christensen,

Kidmose

2024

Ear &Amp; Hearing

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Objectives: The auditory steady-state response (ASSR) enables hearing threshold estimation based on electroencephalography (EEG) recordings. The choice of stimulus type has an impact on both the detectability and the frequency specificity of the ASSR. Amplitude modulated pure tones provide the most frequency-specific ASSR, but responses to pure tones are weak. The ASSR can be enhanced by increasing the bandwidth of the stimulus, but this comes at the cost of a decrease in the frequency specificity of the measured response. The objective of the present study is to investigate the relationship between stimulus bandwidth and ASSR amplitude. Design: The amplitude of ASSR was measured for five types of stimuli: 1 kHz pure tone and band-pass noise with 1/3, 1/2, 1, and 2 octave bandwidths centered at 1 kHz. All stimuli were amplitude modulated with a 40 Hz sinusoid. Responses to all stimulus types were measured at 30, 40, and 50 dB SL. ASSRs were measured concurrently using both conventional scalp-EEG and ear-EEG. Results: Stimulus bandwidth and sound intensity were both found to have a significant effect on the ASSR amplitude for scalp- and ear-EEG recordings. In scalp-EEG ASSRs to all bandwidth stimuli were found to be significantly larger than ASSRs to pure tone at low sound intensity. At higher sound intensities, however, significantly larger responses were only obtained for 1- and 2-octave bandwidth stimuli. In ear-EEG, only the ASSR to 2 octave bandwidth stimulus was significantly larger than the ASSR to amplitude modulated pure tones. Conclusions: At low presentation levels, even small increases in stimulus bandwidth (1/3 and 1/2 octave) improve the detectability of ASSR in scalp-EEG with little or no impact on the frequency specificity. In comparison, a larger increase in stimulus bandwidth was needed to improve the ASSR detectability in the ear-EEG recordings.

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Section: Discussionsupporting

confidence: 93%

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Sergeeva,

Bech Christensen,

Kidmose

2024

Ear &Amp; Hearing

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“…At 110 Hz AM rate, EFR amplitudes at Fz-R did not significantly differ from EFR amplitudes in the L-R montage (β = .009, t = 1.329, p = .194) nor Fz-L montage (β = .004, t = 0.558, p = .581). The similar EFR amplitudes at 110 Hz across montages was consistent with the idea that ~110Hz AM reflects a mixture of contributions from cortical and subcortical generators 44,45 , and as such would not differ significantly between electrode montages. EFRs to faster AM rates (i.e., 512 and 1024 Hz) demonstrated changes in amplitudes consistent with generators originating from more peripheral neural sources.…”

Section: Efrs Can Be Reliably Measured To Assess Auditory Temporal Pr...supporting

confidence: 81%

Sensory representations and pupil-indexed listening effort provide complementary contributions to multi-talker speech intelligibility

McHaney,

Hancock,

Polley

et al. 2023

Preprint

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Optimal speech perception in noise requires successful separation of the target speech stream from multiple competing background speech streams. The ability to segregate these competing speech streams depends on the fidelity of bottom-up neural representations of sensory information in the auditory system and top-down influences of effortful listening. Here, we use objective neurophysiological measures of bottom-up temporal processing using envelope-following responses (EFRs) to amplitude modulated tones and investigate their interactions with pupil-indexed listening effort, as it relates to performance on the Quick speech in noise (QuickSIN) test in young adult listeners with clinically normal hearing thresholds. We developed an approach using ear-canal electrodes and adjusting electrode montages for modulation rate ranges, which extended the rage of reliable EFR measurements as high as 1024Hz. Pupillary responses revealed changes in listening effort at the two most difficult signal-to-noise ratios (SNR), but behavioral deficits at the hardest SNR only. Neither pupil-indexed listening effort nor the slope of the EFR decay function independently related to QuickSIN performance. However, a linear model using the combination of EFRs and pupil metrics significantly explained variance in QuickSIN performance. These results suggest a synergistic interaction between bottom-up sensory coding and top-down measures of listening effort as it relates to speech perception in noise. These findings can inform the development of next-generation tests for hearing deficits in listeners with normal-hearing thresholds that incorporates a multi-dimensional approach to understanding speech intelligibility deficits.

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“…A low-intensity frequency-specific stimulus will elicit a response from only the region of the cochlea which has a characteristic frequency (CF) near that of the stimulus ( Robles & Ruggero, 2001 ; Stapells & Oates, 1997 ). However, at high levels, a wider region of the cochlea will be excited, leading to poorer place specificity (illustrated in Figure 1A , from Polonenko & Maddox, 2019 , and demonstrated by Encina-Llamas et al, 2019 for single SAM tones; Encina-Llamas et al, 2021 for multiple SAM tones; Johannesen et al, 2022 comparing envelope and fine structure encoding). This widened excitation spreads asymmetrically towards the cochlear base, meaning the decreased specificity stems primarily from the contribution of higher-frequency regions—a problem which is most pronounced for low-frequency stimuli.…”

Section: Introductionmentioning

confidence: 99%

“…As stimulus rates increase, off-CF regions will be more continuously driven, which should lead to increased beneficial masking effects. Additionally, place specificity improvements should be present only at higher stimulus levels, since the ABR is already place specific at low levels ( Encina-Llamas et al, 2021 ; Stapells & Oates, 1997 ). Our previous experimental results are consistent with both of these phenomena ( Polonenko & Maddox, 2019 , 2022 ), though PS was not the focus of either of those studies.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Place Specificity of the Parallel Auditory Brainstem Response: A Modeling Study

Stoll,

Maddox

2023

Trends in Hearing

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While each place on the cochlea is most sensitive to a specific frequency, it will generally respond to a sufficiently high-level stimulus over a wide range of frequencies. This spread of excitation can introduce errors in clinical threshold estimation during a diagnostic auditory brainstem response (ABR) exam. Off-frequency cochlear excitation can be mitigated through the addition of masking noise to the test stimuli, but introducing a masker increases the already long test times of the typical ABR exam. Our lab has recently developed the parallel ABR (pABR) paradigm to speed up test times by utilizing randomized stimulus timing to estimate the thresholds for multiple frequencies simultaneously. There is reason to believe parallel presentation of multiple frequencies provides masking effects and improves place specificity while decreasing test times. Here, we use two computational models of the auditory periphery to characterize the predicted effect of parallel presentation on place specificity in the auditory nerve. We additionally examine the effect of stimulus rate and level. Both models show the pABR is at least as place specific as standard methods, with an improvement in place specificity for parallel presentation (vs. serial) at high levels, especially at high stimulus rates. When simulating hearing impairment in one of the models, place specificity was also improved near threshold. Rather than a tradeoff, this improved place specificity would represent a secondary benefit to the pABR's faster test times.

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On the use of envelope following responses to estimate peripheral level compression in the auditory system

Cited by 11 publications

References 117 publications

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Sensory representations and pupil-indexed listening effort provide complementary contributions to multi-talker speech intelligibility

Enhanced Place Specificity of the Parallel Auditory Brainstem Response: A Modeling Study

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