The technique, validity and clinical use of the sweep VEP

Almoqbel, Fahad; Leat, Susan J.; Irving, Elizabeth L.

doi:10.1111/j.1475-1313.2008.00591.x

Cited by 64 publications

(53 citation statements)

References 42 publications

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“…These steps were defined as the epochs either above or below the average thresholds found in previous comparable experiments. 4,18,20,25,30,35 More precisely, for visual acuity, this corresponded to the nine steps with spatial frequency from 2.7 to 9.7 cpd for group E, and to the seven steps from 3.8 to 9.4 cpd for group AA. For contrast sensitivity, this corresponded to the nine steps with contrast from 1.5% to 16%.…”

Section: Eeg Analysismentioning

confidence: 99%

Rapid Objective Assessment of Contrast Sensitivity and Visual Acuity With Sweep Visual Evoked Potentials and an Extended Electrode Array

Hemptinne¹,

Liu‐Shuang²,

Yüksel

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. Sweep visual evoked potentials (sVEPs) provide an implicit, objective, and sensitive evaluation of low-level visual functions such as visual acuity and contrast sensitivity. For practical and traditional reasons, sVEPs in ophthalmologic examinations have usually been recorded over a single or a limited number of electrodes over the medial occipital region. Here we examined whether a higher density of recording electrodes improves the estimation of individual low-level visual thresholds with sVEPS, and to which extent such testing could be streamlined for clinical application. METHODS.To this end, we tested contrast sensitivity and visual acuity in 26 healthy adult volunteers with a 68-electrode electroencephalogram (EEG) system. RESULTS.While the most sensitive electrophysiologic response was found at the traditional medial occipital electrode Oz in a small majority of individuals, it was found at neighboring electrodes for the remaining participants. At the group level, lower spatial frequencies were also associated with right lateralized responses. More generally, visual function was evaluated more sensitively based on EEG recorded at the most sensitive electrode defined individually for each participant. Our data suggest that recording over seven posterior electrodes while limiting the testing session to less than 15 minutes ensures a sensitive and consistent estimation of acuity and contrast sensitivity threshold estimates in every individual.CONCLUSIONS. The present study shows that sampling from a larger number of posterior scalp electrodes is relevant to optimize visual function assessment and could be achieved efficiently in the time-constrained clinical setting.

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Section: Eeg Analysismentioning

confidence: 99%

Rapid Objective Assessment of Contrast Sensitivity and Visual Acuity With Sweep Visual Evoked Potentials and an Extended Electrode Array

Hemptinne¹,

Liu‐Shuang²,

Yüksel

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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“…The existing data have been obtained using fixed spatiotemporal (ST) frequencies to elicit the VEP, and these indicate that the binocular motion subsystem underlying the DMA matures (symmetricizes) earlier for low spatiotemporal frequencies (e.g., Norcia, 2004;Norcia, Hamer, & Orel-Bixler, 1990a). A natural approach to more efficient mapping of the spatiotemporal domain of the DMA would be to take advantage of the swept-parameter VEP, as used extensively to study grating acuity, contrast sensitivity, motion responses, and vernier responses in infants and adults (Almoqbel, Leat, & Irving, 2008;Chen et al, 2005;Hamer et al, 1989;Hou et al, 2007;Norcia et al, 1989Norcia et al, , 1999Norcia et al, 1990b;Norcia & Tyler, 1985;Oliveira et al, 2004;Salomão, Ejzenbaum, Berezovsky, Sacai, & Pereira, 2008;Tyler, Apkarian, Levi, & Nakayama, 1979). The present study introduces a stimulus paradigm in which, for a given temporal frequency, a grating undergoing 90-deg oscillatory displacements is swept in SF.…”

Section: A New Paradigm For Mapping the Spatiotemporal Development Ofmentioning

confidence: 99%

The Jitter Spatial Frequency Sweep VEP: A new paradigm to study spatiotemporal development of pattern- and motion-processing mechanisms in human infants.

Hamer¹,

Norcia²

2009

Psychology & Neuroscience

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We introduce a new VEP paradigm -the Jitter Spatial Frequency (JSF) Sweep VEP -that permits efficient mapping of the spatiotemporal tuning of the developmental motion asymmetry (DMA). Vertical sinewave gratings undergoing 90 o horizontal oscillatory displacements (6 or 10 Hz) were presented while their SF was swept over 2 to 5 octaves during each VEP trial. JSF sweep VEPs were recorded from 28 infants (8-43 weeks), and symmetric (second-harmonic, F2) and asymmetric (F1) components of the VEP were measured. JSF sweeps can provide four useful estimates: (1,2) the high-SF cutoff of F1 and F2 responses estimates the spatial resolution of direction-selective (DS) and non-DS mechanisms, respectively; (3) the low-SF cutoff for F1 estimate the SF-boundary between mature (F1 absent) and immature (F1 present) DS mechanisms; and (4) the F1 high-SF cutoff estimates the lower velocity limit of cortical DS cells. For 6 Hz, the low-SF F1 cutoffs increased two times faster than traditional (contrast-reversal) VEP grating acuity (0.5 vs ~0.25 octaves/month), and twice that of the high-SF F1 and F2 cutoffs. This implies that no single mechanism can account for the DMA at both low and high SFs. At 10 Hz, the DMA exhibited no significant development, consistent with slower maturation of DS mechanisms at higher ST frequencies. The F2 high-SF cutoffs were higher than F1 at both 6 and 10 Hz, suggesting higher spatial resolution for non-DS (pattern) vs DS (motion) mechanisms. Finally, the lower velocity limit of the DS mechanisms decreased from ~2 deg/sec at 8 weeks, to 0.75 deg/sec at 33 weeks, similar to analogous limits for direction-of-motion identification in adults (~0.5 -1 deg/sec), and close to prior VEP estimates in infants (0.6 deg/sec).

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“…Studies show that this technique may be valuable in assessing visual acuity in nonverbal children [16].…”

Section: Visual Acuity Assessmentmentioning

confidence: 99%

Children with Developmental Disability and Visual Impairment: What Information Can an Ophthalmologist Provide to Family and School

Lehman

2013

Curr Ophthalmol Rep

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Improved technology has increased survival of infants with serious medical conditions in the US, as well as worldwide, at a cost of significant developmental disability and sensory deficits in many children. This has created a public health challenge and is stressful to families who are the primary caretakers of children with complex medical problems resulting in disabilities. Children with comorbidities such as developmental disability and visual impairment have more difficulty than children with normal development. The pediatric ophthalmologist is an essential member of the multidisciplinary team caring for the child. The pediatric ophthalmologist can provide essential information and specific recommendations for medically necessary services, accommodations and interventions that can aid a child and family in reaching the child's potential and relieve stress.

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The technique, validity and clinical use of the sweep VEP

Cited by 64 publications

References 42 publications

Rapid Objective Assessment of Contrast Sensitivity and Visual Acuity With Sweep Visual Evoked Potentials and an Extended Electrode Array

Rapid Objective Assessment of Contrast Sensitivity and Visual Acuity With Sweep Visual Evoked Potentials and an Extended Electrode Array

The Jitter Spatial Frequency Sweep VEP: A new paradigm to study spatiotemporal development of pattern- and motion-processing mechanisms in human infants.

Children with Developmental Disability and Visual Impairment: What Information Can an Ophthalmologist Provide to Family and School

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