Neural encoding of spectro-temporal cues at slow and near speech-rate in cochlear implant users

Undurraga, Jaime A.; Yper, Lindsey Van; Bance, Manohar; McAlpine, David; Vickers, Deborah

doi:10.1016/j.heares.2020.108160

Cited by 13 publications

(36 citation statements)

References 74 publications

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“…Therefore, using a contralateral reference minimized the spread of electrical artefacts offering an advantage for real-time assessment, since it is often sufficient to unveil artefact-free responses on contralateral frontal electrodes. Note that the use of a contralateral electrode as the reference has no impact on the quality of the responses investigated in this or previous studies [3] , [4] , [5] .…”

Section: Methodsmentioning

confidence: 69%

“…The large number of conditions tested in this study would have been impossible to carry out in human CI listeners. However, examples from CI listeners are also provided in this study and fully reported in the associated research article [3] .…”

Section: Methodsmentioning

confidence: 98%

“…Voltage offsets were within

20 mV and EEG data were referenced to the channel contralateral to the implant (T7). This reference electrode was selected to allow direct comparisons with the associated research article [3] where a contralateral electrode, relative to the CI, was used as the reference. In that study, as well as previous ones [4] , [5] , we have found that contralateral electrodes show significantly less artefacts than electrodes in close proximity to the CI.…”

Section: Methodsmentioning

confidence: 99%

“…40 Hz; [7] )—; and steady-state auditory change following response (AC-FR)—a cortical response evoked by transitions of auditory cues at a high rates (e.g. 7 Hz; [3] , [8] ). ACC responses were generated using a template response with P1-N1-P2 peaks.…”

Section: Methodsmentioning

confidence: 99%

“…7 Hz). In addition to these cortical responses, ASSRs to each AM frequency are also evoked [3] . Here, the pulse train was presented at 902 pps and the AM frequencies (20 Hz and 40 Hz) were presented at an alternating rate of 1 Hz on the CI electrode 16.…”

Section: Methodsmentioning

confidence: 99%

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Characterizing Cochlear implant artefact removal from EEG recordings using a real human model

et al. 2021

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Section: Methodsmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 98%

“…Voltage offsets were within

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Characterizing Cochlear implant artefact removal from EEG recordings using a real human model

et al. 2021

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Temporal Pitch Sensitivity in an Animal Model: Psychophysics and Scalp Recordings

Richardson

Guérit

Gransier

et al. 2022

JARO

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Cochlear implant (CI) users show limited sensitivity to the temporal pitch conveyed by electric stimulation, contributing to impaired perception of music and of speech in noise. Neurophysiological studies in cats suggest that this limitation is due, in part, to poor transmission of the temporal fine structure (TFS) by the brainstem pathways that are activated by electrical cochlear stimulation. It remains unknown, however, how that neural limit might influence perception in the same animal model. For that reason, we developed non-invasive psychophysical and electrophysiological measures of temporal (i.e., non-spectral) pitch processing in the cat. Normal-hearing (NH) cats were presented with acoustic pulse trains consisting of band-limited harmonic complexes that simulated CI stimulation of the basal cochlea while removing cochlear place-of-excitation cues. In the psychophysical procedure, trained cats detected changes from a base pulse rate to a higher pulse rate. In the scalp-recording procedure, the cortical-evoked acoustic change complex (ACC) and brainstem-generated frequency following response (FFR) were recorded simultaneously in sedated cats for pulse trains that alternated between the base and higher rates. The range of perceptual sensitivity to temporal pitch broadly resembled that of humans but was shifted to somewhat higher rates. The ACC largely paralleled these perceptual patterns, validating its use as an objective measure of temporal pitch sensitivity. The phase-locked FFR, in contrast, showed strong brainstem encoding for all tested pulse rates. These measures demonstrate the cat’s perceptual sensitivity to pitch in the absence of cochlear-place cues and may be valuable for evaluating neural mechanisms of temporal pitch perception in the feline animal model of stimulation by a CI or novel auditory prostheses.

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Electrophysiological and Psychophysical Measures of Temporal Pitch Sensitivity in Normal-hearing Listeners

Guérit

Harland

Richardson

et al. 2022

JARO

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To obtain combined behavioural and electrophysiological measures of pitch perception, we presented harmonic complexes, bandpass filtered to contain only high-numbered harmonics, to normal-hearing listeners. These stimuli resemble bandlimited pulse trains and convey pitch using a purely temporal code. A core set of conditions consisted of six stimuli with baseline pulse rates of 94, 188 and 280 pps, filtered into a HIGH (3365–4755 Hz) or VHIGH (7800–10,800 Hz) region, alternating with a 36% higher pulse rate. Brainstem and cortical processing were measured using the frequency following response (FFR) and auditory change complex (ACC), respectively. Behavioural rate change difference limens (DLs) were measured by requiring participants to discriminate between a stimulus that changed rate twice (up-down or down-up) during its 750-ms presentation from a constant-rate pulse train. FFRs revealed robust brainstem phase locking whose amplitude decreased with increasing rate. Moderate-sized but reliable ACCs were obtained in response to changes in purely temporal pitch and, like the psychophysical DLs, did not depend consistently on the direction of rate change or on the pulse rate for baseline rates between 94 and 280 pps. ACCs were larger and DLs lower for stimuli in the HIGH than in the VHGH region. We argue that the ACC may be a useful surrogate for behavioural measures of rate discrimination, both for normal-hearing listeners and for cochlear-implant users. We also showed that rate DLs increased markedly when the baseline rate was reduced to 48 pps, and compared the behavioural and electrophysiological findings to recent cat data obtained with similar stimuli and methods.

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Neural encoding of spectro-temporal cues at slow and near speech-rate in cochlear implant users

Cited by 13 publications

References 74 publications

Characterizing Cochlear implant artefact removal from EEG recordings using a real human model

Characterizing Cochlear implant artefact removal from EEG recordings using a real human model

Temporal Pitch Sensitivity in an Animal Model: Psychophysics and Scalp Recordings

Electrophysiological and Psychophysical Measures of Temporal Pitch Sensitivity in Normal-hearing Listeners

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