A frequency-tagging electrophysiological method to identify central and peripheral visual field deficits

Hébert-Lalonde, Noémie; Carmant, Lionel; Safi, Dima; Roy, Mélissa; Lassonde, Maryse; Saint-Amour, Dave

doi:10.1007/s10633-014-9439-9

Cited by 10 publications

(9 citation statements)

References 53 publications

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“…The field-specific VEP had a sensitivity of 75% and a specificity of 87.5% [ 55 ]. This technique was further developed by Hébert-Lalonde et al [ 56 , 57 ] that used steady-state VEP and pattern ERG to field-specific radial checkerboards. They showed significantly lower responses to peripheral stimulations in the vigabatrin-exposed group, that were negatively correlated to vigabatrin exposure duration.…”

Section: Peripheral Visual-field Defectmentioning

confidence: 99%

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

Handley

Šuštar

Pompe

2021

Eye

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Recognising a potential visual-field (VF) defect in paediatric patients might be challenging, especially in children before the age of 5 years and those with developmental delay or intellectual disability. Visual electrophysiological testing is an objective and non-invasive technique for evaluation of visual function in paediatric patients, which can characterise the location of dysfunction and differentiate between disorders of the retina, optic nerve and visual pathway. The recording of electroretinography (ERG) and visual-evoked potentials (VEP) is possible from early days of life and requires no subjective input from the patient. As the origins of ERG and VEP tests are known, the pattern of electrophysiological changes can provide information about the VF of a child unable to perform accurate perimetry. This review summarises previously published electrophysiological findings in several common types of VF defects that can be found in paediatric patients (generalised VF defect, peripheral VF loss, central scotoma, bi-temporal hemianopia, altitudinal VF defect, quadrantanopia and homonymous hemianopia). It also shares experience on using electrophysiological testing as additional functional evidence to other tests in the clinical challenge of diagnosing or excluding VF defects in complex paediatric patients. Each type of VF defect is illustrated with one or two clinical cases.

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Section: Peripheral Visual-field Defectmentioning

confidence: 99%

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

Handley

Šuštar

Pompe

2021

Eye

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“…Sorne authors suggest placing 3 electrodes, one at Oz, 01 and 02 (Odom et al, 2010), but a recent study indicated that there was no significant diff erence in information harvested from one to three electrodes. The electrode placed at 'Oz' gathered significantly higher signals in response to central visual stimulations, and recorded a similar signal in ail three electrodes for the peripheral visual stimulat~on (Hébert-Lalonde et al, 2014). Furthermore, using only one active electrode reduces electrode placement time, m~g it convenient for the population of interest.…”

Section: Electrode Placementmentioning

confidence: 95%

“…One method that has been explored and shows promise in its ability to detect visual field deficits is VEPs. Field-specific VEPs have been used to measure visual responses to central and peripheral visual stimuli (Harding, Robertson, & Holliday, 2000;Hébert-Lalonde et al, 2014;. Although this approach is useful for some populations, its current clinical application for children with OPGs is not optimal since field-specific VEPs are usually tested from transient VEPs (i.e., from low-rate abrupt stimulus presentations).…”

Section: Using Veps To Assess Visual Functionsmentioning

confidence: 99%

“…A field-specific method using steady-state VEPs to assess visual fonctions has recently been examined in adolescents (Hébert-Lalonde et al, 2014). By contrast to transient VEPs, ssVEPs are obtained following fast-rate stimulus presentation (4 rps or more) so that the brain generates electrical activity at the same frequency as the displayed visual stimulus.…”

Section: Using Veps To Assess Visual Functionsmentioning

confidence: 99%

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Central and peripheral steady-state visual evoked potentials in children with optic pathway gliomas

et al. 2019

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Optic Pathway Gliomas (OPG) represent 4-6% of brain tumors in children. Treatment of optic pathway gliomas is prompted by neuroradiological evidence of tumor growth, usually associated with progressive visual loss. Despite therapy, approximately 40% will show visual deterioration. Treatment outcome is largely based on the preservation of vision. However, current visual fonction assessment is often unreliable in children with optic pathway gliomas who have limited collaboration. Thus, there is a need for new clinical tools to evaluate visual functions in these children. The_aim of the study was to assess the usefulness of steady-state visual evoked potentials as a tool to assess the integrity of the central and peripheral visual fields of children with optic pathway gliomas.Ten patients with optic pathway gliomas and 33 healthy controls (ages 3 to• 18 years) were tested using steady-state visual evoked potentials. The circular dart-board stimulus consisted of one central circle altemating at 16 reversals/second and one peripheral hoop alternating at 14.4 reversals/second, separated by ahoop of gray space. It was presented Iilonocularly at 30% and 96% contrasts.Results indicated that central signal-to-noise ratios were significantly lower in children with optic pathway gliomas compared to controls. However, no significant group difference was detected in the peripheral visual field.In conclusion, our study shows that steady-state visual evoked potentials could be useful in the clinical assessment and follow up of central visual • field deficits in uncooperative or non-verbal children but seems to have limited usefulness for the evaluation of peripheral visual field defièits. Additional studies are needed to identify • . testing parameters for full visual-field assessment.

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“…Provided that the light conditions are carefully chosen (Herrmann, 2001;Norcia et al, 2015), and are kept constant throughout the trials, the stimulus elicits a detectable neural response, and if there are enough trials recorded, the amplitude of the frequency or frequencies corresponding to the stimulus will elevated in the spectrum of the SSVEP. The elevated frequencies may not always be the same as the temporal frequency of the stimulus (Hébert-Lalonde et al, 2014): it may be a harmonic (Norcia and Tyler, 1984) or if several temporal frequencies are used at the same time, they may produce intermodulational products (Baitch and Levi, 1988): the sum and difference of these frequencies, or an arbitrary combination of these. SSVEPs may be studied with techniques other than EEG as well, such as Magnetoencephalography (MEG) (Srinivasan et al, 1999) or functional Magnetic Resonance Imaging (fMRI) (Boremanse et al, 2013) as well.…”

Section: Introductionmentioning

confidence: 99%

Optimal Approach for Signal Detection in Steady-State Visual Evoked Potentials in Humans Using Single-Channel EEG and Stereoscopic Stimuli

Derzsi

2021

Front. Neurosci.

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In EEG studies, one of the most common ways to detect a weak periodic signal in the steady-state visual evoked potential (SSVEP) is spectral evaluation, a process that detects peaks of power present at notable temporal frequencies. However, the presence of noise decreases the signal-to-noise ratio (SNR), which in turn lowers the probability of successful detection of these spectral peaks. In this paper, using a single EEG channel, we compare the detection performance of four different metrics to analyse the SSVEP: two metrics that use spectral power density, and two other metrics that use phase coherency. We employ these metrics find weak signals with a known temporal frequency hidden in the SSVEP, using both simulation and real data from a stereoscopic apparent depth movement perception task. We demonstrate that out of these metrics, the phase coherency analysis is the most sensitive way to find weak signals in the SSVEP, provided that the phase information of the stimulus eliciting the SSVEP is preserved.

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A frequency-tagging electrophysiological method to identify central and peripheral visual field deficits

Cited by 10 publications

References 53 publications

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

Central and peripheral steady-state visual evoked potentials in children with optic pathway gliomas

Optimal Approach for Signal Detection in Steady-State Visual Evoked Potentials in Humans Using Single-Channel EEG and Stereoscopic Stimuli

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