Hemispheric differences in electrical and hemodynamic responses during hemifield visual stimulation with graded contrasts

Si, Juanning; Zhang, Xin; Zhang, Yujin; Jiang, Tianzi

doi:10.1364/boe.8.002018

Cited by 3 publications

(1 citation statement)

References 53 publications

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“…Using these optical properties, the concentration of haemoglobin can be calculated by measuring the light intensity in the cerebral cortex, which indirectly reflects the functional activation state of this area. The special characteristics of neurovascular coupling mechanisms are the basis for the application of fNIRS detection technology 36,37 …”

Section: Discussionmentioning

confidence: 99%

Changes in visual cortical function in moderately myopic patients: a functional near‐infrared spectroscopy study

Zhang

Xiao

et al. 2021

Ophthalmic Physiologic Optic

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PurposeTo investigate haemoglobin oxygenation in the visual cortex of myopic patients using functional near‐infrared spectroscopy (fNIRS).MethodsThe experiment consisted of two parts. Part 1 examined functional changes in the visual cortex before and after refractive correction in myopic patients. Subjects were divided into normal controls, uncorrected and corrected myopes. Part 2 examined functional changes in the visual cortex caused by lens‐induced myopia in normal subjects, and whether this activity recovered after a period of rest. Here, subjects were divided into three groups: emmetropes, lens‐induced myopia and a rest group. The rest group completed a test with the uncorrected eye following lens removal and 5 min of rest. The visual stimulus was a black and white checkerboard. fNIRS was used to detect changes in oxyhaemoglobin content within the visual cortex. The original fNIRS data were analysed using MATLAB to obtain the β values (the visual cortical activity response caused by the task); these were used to calculate Δβ, which represents the degree of change in oxygenated haemoglobin caused by visual stimulation.ResultsThe Δβ value measured in each single channel or only in the region of interest (ROI) was significantly higher in the emmetropic control group than the uncorrected myopic group. After optical correction, the responses of myopic subjects approached those of the emmetropes and were not significantly different. If myopia was induced in emmetropic subjects by imposing defocus with positive lenses, a decline in functional activity was observed similar that observed in uncorrected myopes. Activity recovered after the lenses were removed.ConclusionsMyopic defocus reduced the level of haemoglobin oxygenation in the visual cortex, but activity could be restored by optical correction.

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Section: Discussionmentioning

confidence: 99%

Changes in visual cortical function in moderately myopic patients: a functional near‐infrared spectroscopy study

Zhang

Xiao

et al. 2021

Ophthalmic Physiologic Optic

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A systematic review on hybrid EEG/fNIRS in brain-computer interface

Liu

Shore

Wang

et al. 2021

Biomedical Signal Processing and Control

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Viewing neurovascular coupling through the lens of combined EEG–fNIRS: A systematic review of current methods

Yeung

Chu

2022

Psychophysiology

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Neurovascular coupling is a key physiological mechanism that occurs in the healthy human brain, and understanding this process has implications for understanding the aging and neuropsychiatric populations. Combined electroencephalography (EEG) and functional near‐infrared spectroscopy (fNIRS) has emerged as a promising, noninvasive tool for probing neurovascular interactions in humans. However, the utility of this approach critically depends on the methodological quality used for multimodal integration. Despite a growing number of combined EEG–fNIRS applications reported in recent years, the methodological rigor of past studies remains unclear, limiting the accurate interpretation of reported findings and hindering the translational application of this multimodal approach. To fill this knowledge gap, we critically evaluated various methodological aspects of previous combined EEG–fNIRS studies performed in healthy individuals. A literature search was conducted using PubMed and PsycINFO on June 28, 2021. Studies involving concurrent EEG and fNIRS measurements in awake and healthy individuals were selected. After screening and eligibility assessment, 96 studies were included in the methodological evaluation. Specifically, we critically reviewed various aspects of participant sampling, experimental design, signal acquisition, data preprocessing, outcome selection, data analysis, and results presentation reported in these studies. Altogether, we identified several notable strengths and limitations of the existing EEG–fNIRS literature. In light of these limitations and the features of combined EEG–fNIRS, recommendations are made to improve and standardize research practices to facilitate the use of combined EEG–fNIRS when studying healthy neurovascular coupling processes and alterations in neurovascular coupling among various populations.

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Hemispheric differences in electrical and hemodynamic responses during hemifield visual stimulation with graded contrasts

Cited by 3 publications

References 53 publications

Changes in visual cortical function in moderately myopic patients: a functional near‐infrared spectroscopy study

Changes in visual cortical function in moderately myopic patients: a functional near‐infrared spectroscopy study

A systematic review on hybrid EEG/fNIRS in brain-computer interface

Viewing neurovascular coupling through the lens of combined EEG–fNIRS: A systematic review of current methods

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