The use of broad vs restricted regions of interest in functional near-infrared spectroscopy for measuring cortical activation to auditory-only and visual-only speech

Shader, Maureen J.; Luke, Robert H.; Gouailhardou, Nathalie; McKay, Colette M.

doi:10.1016/j.heares.2021.108256

Cited by 31 publications

(35 citation statements)

References 64 publications

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“…When taken together as a group (i.e., combining left-implanted and right-implanted participants), auditory- and visual-evoked responses were relatively consistent with a previous study using the identical experimental paradigm in a group of normal-hearing participants ( Shader et al., 2021 ). Despite the listeners’ extended period of sensory deprivation following hearing loss, the evoked waveforms demonstrated a canonical hemodynamic response morphology as shown in Figure 1 .…”

Section: Resultssupporting

confidence: 84%

“…(C) Group-level results for oxyhemoglobin for the same experimental paradigm from a group of normal-hearing listeners who were presented auditory-only stimuli to both ears. Results are re-plotted as projections onto the brain surface from Shader et al. (2021) .…”

Section: Methodsmentioning

confidence: 99%

“…fNIRS uses near-infrared light to estimate the concentration of oxygenated hemoglobin in the cortical blood flow. It is sensitive to brain activity in outer cortical surfaces, including both the auditory and visual cortices ( Luke et al., 2021a , 2022 ; Shader et al., 2021 ; Wiggins et al., 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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Contralateral dominance to speech in the adult auditory cortex immediately after cochlear implantation

2022

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Section: Resultssupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

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Contralateral dominance to speech in the adult auditory cortex immediately after cochlear implantation

2022

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“…Channels over the left and right superior temporal gyri, comprising typical auditory regions of interest, were then combined into a single region of interest using a weighted average of the GLM estimates. 32 If the p value of the regressor component of the speech task in the GLM estimate was <0.05 (i.e., a significant HbO response evoked by auditory speech), a response was deemed present. As such, for each participant, a task-locked neural response was quantified as either present or absent for both analyses, with and without short-channel regressions.…”

Section: Single Dataset Examplementioning

confidence: 99%

Characterization of Mayer-wave oscillations in functional near-infrared spectroscopy using a physiologically informed model of the neural power spectra

2021

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Significance: Mayer waves are spontaneous oscillations in arterial blood pressure that can mask cortical hemodynamic responses associated with neural activity of interest.Aim: We aim to characterize the properties of oscillations in the functional near-infrared spectroscopy (fNIRS) signal generated by Mayer waves in a large sample of fNIRS recordings. Further, we aim to determine the impact of short-channel correction for the attenuation of these unwanted signal components.Approach: Mayer-wave oscillation parameters were extracted from 310 fNIRS measurements using the fitting oscillations and one-over-f method to compute normative values. The effect of short-channel correction on Mayer-wave oscillation power was quantified on 222 measurements. The practical benefit of the short-channel correction approach for reducing Mayer waves and improving response detection was also evaluated on a subgroup of 17 fNIRS measurements collected during a passive auditory speech detection experiment.Results: Mayer-wave oscillations had a mean frequency of 0.108 Hz, bandwidth of 0.04 Hz, and power of 3.5 μM 2 ∕Hz. The distribution of oscillation signal power was positively skewed, with some measurements containing large Mayer waves. Short-channel correction significantly reduced the amplitude of these undesired signals; greater attenuation was observed for measurements containing larger Mayer-wave oscillations.Conclusions: A robust method for quantifying Mayer-wave oscillations in the fNIRS signal spectrum was presented and used to provide normative parameterization. Short-channel correction is recommended as an approach for attenuating Mayer waves, particularly in participants with large oscillations.

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“…In addition, functional magnetic resonance imaging is highly prone to any motion artefact (incompatible with awake infants) and is very loud. fNIRS measures cortical activity in topographically distinct regions of interest, and thus is a suitable tool to investigate higher-order cortical processing such as that associated with speech discrimination or language understanding 9 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Speech token detection and discrimination in individual infants using functional near-infrared spectroscopy

Mao

Wunderlich

Savković

et al. 2021

Sci Rep

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Speech detection and discrimination ability are important measures of hearing ability that may inform crucial audiological intervention decisions for individuals with a hearing impairment. However, behavioral assessment of speech discrimination can be difficult and inaccurate in infants, prompting the need for an objective measure of speech detection and discrimination ability. In this study, the authors used functional near-infrared spectroscopy (fNIRS) as the objective measure. Twenty-three infants, 2 to 10 months of age participated, all of whom had passed newborn hearing screening or diagnostic audiology testing. They were presented with speech tokens at a comfortable listening level in a natural sleep state using a habituation/dishabituation paradigm. The authors hypothesized that fNIRS responses to speech token detection as well as speech token contrast discrimination could be measured in individual infants. The authors found significant fNIRS responses to speech detection in 87% of tested infants (false positive rate 0%), as well as to speech discrimination in 35% of tested infants (false positive rate 9%). The results show initial promise for the use of fNIRS as an objective clinical tool for measuring infant speech detection and discrimination ability; the authors highlight the further optimizations of test procedures and analysis techniques that would be required to improve accuracy and reliability to levels needed for clinical decision-making.

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The use of broad vs restricted regions of interest in functional near-infrared spectroscopy for measuring cortical activation to auditory-only and visual-only speech

Cited by 31 publications

References 64 publications

Contralateral dominance to speech in the adult auditory cortex immediately after cochlear implantation

Contralateral dominance to speech in the adult auditory cortex immediately after cochlear implantation

Characterization of Mayer-wave oscillations in functional near-infrared spectroscopy using a physiologically informed model of the neural power spectra

Speech token detection and discrimination in individual infants using functional near-infrared spectroscopy

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