Dichotic listening deficits in amblyaudia are characterized by aberrant neural oscillations in auditory cortex

Momtaz, Sara; Moncrieff, Deborah; Bidelman, Gavin M.

doi:10.1016/j.clinph.2021.04.022

Cited by 12 publications

(37 citation statements)

References 114 publications

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“…To quantify the rate and jitter-related effects on auditory coding, we extracted the time course of the most robust frequency band from each spectrogram. We have typically observed dominant EEG energy to similar repetitive stimuli in the high β/low γ band frequency range (∼30 Hz) (Momtaz et al, 2021) (see also Fig. 3).…”

Section: Methodsmentioning

confidence: 93%

“…Having the same result, however, it is possible that individuals who show better brain-to-acoustic coupling relegate temporal processing to lower levels of the auditory system (e.g., brainstem, thalamus), more peripheral to the behavior and cortical responses assessed here. Whereas others who perform worse or more laboriously in temporal processing tasks might require high levels of auditory processing at the cortical level as a form of compensatory mechanism (Momtaz et al, 2021; Momtaz et al, 2022). This might account for the counterintuitive negative correlation we find between cortical phase-locking strength and behavior, i.e., more effortful encoding (higher PLV) in less perceptually sensitive individuals.…”

Section: Discussionmentioning

confidence: 99%

“…The two orientations were pooled for subsequent analyses. This approach allowed us to reduce each listener’s 64-channel data to 2 source channels describing neuronal currents localized to the left and right AC (Momtaz et al, 2021; Price et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…In the context of speech, oscillatory neural entrainment is the process by which auditory cortical activity precisely tracks and adjusts to modulations in the speech amplitude envelope via phase alignment between the neural and acoustic signal (Lakatos et al, 2019; Pikovsky et al, 2002). Entrainment is one of several important functions in auditory processing that can make communication seem effortless and automatic to healthy listeners and conversely, difficult in individuals with language learning disorders (Momtaz et al, 2021; Momtaz et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Entrainment is one of several important functions in auditory processing that can make communication seem effortless and automatic to healthy listeners and conversely, difficult in individuals with language learning disorders (Momtaz et al, 2021;Momtaz et al, 2022).…”

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confidence: 99%

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Effects of stimulus rate and periodicity on auditory cortical entrainment to continuous sounds

Momtaz

Bidelman

2022

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The neural mechanisms underlying the exogenous coding and neural entrainment to rapid auditory stimuli have seen a recent surge of interest. However, few studies have characterized how parametric changes in stimulus presentation alter entrained responses. Applying inter-trial phase-locking (ITPL) and phase-locking value (PLV) analyses applied to high-density human electroencephalogram (EEG) data, we investigated the degree to which the brain entrains to speech vs. non-speech (i.e., click) sounds within and across tokens. Passive cortico-acoustic tracking was investigated in N=24 normal young adults utilizing EEG time-frequency and source analyses that isolated neural activity stemming from both auditory temporal cortices. We parametrically manipulated the rate and periodicity of repetitive, continuous speech and click stimuli to investigate how speed and jitter in ongoing sounds stream affect oscillatory entrainment. Both stimulus domains showed rightward hemisphere asymmetry in phase-locking strength with stronger and earlier responses to speech vs. clicks. Neuronal synchronization to speech was enhanced at 4.5 Hz (the putative universal rate of speech) and showed a differential pattern to that of clicks, particularly at higher rates. Phase-locking to speech decreased with increasing jitter but entrainment to speech remained superior to clicks. Surprisingly, click were invariant to periodicity manipulations. Our findings provide evidence that the brain's neural entrainment to complex sounds is enhanced and more sensitized when processing speech relative to non-speech sounds. That this specialization is apparent even under passive listening suggests a priority of the auditory system for synchronizing to behaviorally-relevant signals.

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Section: Methodsmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%