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Towards Upgrade of Visual Evoked Potentials in Basic and Clinical...
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Towards Upgrade of Visual Evoked Potentials in Basic and Clinical Studies

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Biomedical Sensors".

Deadline for manuscript submissions: closed (20 May 2023) | Viewed by 5400

Special Issue Editor

Prof. Dr. Juliusz Huber

E-Mail Website
Guest Editor
Department of Pathophysiology of Locomotor Organs, Poznan University of Medical Sciences, 28 Czerwca 1956 nr 135/147, 60-545 Poznań, Poland
Interests: neurophysiology; neuroanatomy; rehabilitation; neuroengineering; neuroregeneration
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The visual evoked potential (VEPs) are the bioelectric signals generated in the striate and extrastriate cortex when the retina is stimulated with light which can be recorded from the scalp electrodes. Methodologies of VEPs study have been developed over the years towards increasing the sensitivity of stimulation and recordings, including interpretation of recording components parameters. VEPs are most useful for testing optic nerve function and less useful for assessing postchiasmatic disorders. The role of VEPs utility in conformation of multiple sclerosis symptoms is unquestionable. This Special Issue is devoted to aspects of VEP recordings offering perspectives for further research in normal and pathological conditions both in basic and clinical studies.

Different patterns of photo stimuli and types of electrodes as well sites over the skull are extensively tested to increase the sensitivity and specificity of Visual Evoked Potentials recordings in diagnostic studies.

Prof. Dr. Juliusz Huber
Guest Editor

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Keywords

  • visual evoked potentials
  • visual tract testing
  • basic studies
  • clinical testing
  • gender
  • normative values
  • pattern reversal
  • flash VEP

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Published Papers (2 papers)

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Research

21 pages, 852 KiB  
Article
The Impact of the Wavelength and Its Transmittance on the Visual Evoked Potentials, at Baseline, and under the Effect of Six Monochromatic Filters Used for Visual Treatments
by Danjela Ibrahimi, Enoé Crúz-Martínez, Guillermo Valencia Luna, Josué Romero Turrubiates and Juvenal Rodríguez-Reséndiz
Sensors 2023, 23(11), 5227; https://doi.org/10.3390/s23115227 - 31 May 2023
Cited by 2 | Viewed by 3047
Abstract
Purpose: This is an observational, non-invasive study which measures the VEPs of twelve individuals, at baseline, and under the effect of six monochromatic filters used in visual therapy, to understand their effect on neural activity to propose successful treatments. Methods: Monochromatic filters were [...] Read more.
Purpose: This is an observational, non-invasive study which measures the VEPs of twelve individuals, at baseline, and under the effect of six monochromatic filters used in visual therapy, to understand their effect on neural activity to propose successful treatments. Methods: Monochromatic filters were chosen to represent the visible light spectrum, going from red to violet color, 440.5–731 nm, and light transmittance from 19 to 89.17%. Two of the participants presented accommodative esotropia. The impact of each filter, differences, and similarities among them, were analyzed using non-parametric statistics. Results: There was an increase on the N75 and P100 latency of both eyes and a decrease was on the VEP amplitude. The neurasthenic (violet), omega (blue), and mu (green) filter had the biggest effects on the neural activity. Changes may primarily be attributable to transmittance (%) for blue-violet colors, wavelength (nm) for yellow-red colors, and a combination of both for the green color. No significant VEPs differences were seen in accommodative strabismic patients, which reflects the good integrity and functionality of their visual pathway. Conclusions: Monochromatic filters, influenced the axonal activation and the number of fibers that get connected after stimulating the visual pathway, as well as the time needed for the stimulus to reach the visual cortex and thalamus. Consequently, modulations to the neural activity could be due to the visual and non-visual pathway. Considering the different types of strabismus and amblyopia, and their cortical-visual adaptations, the effect of these wavelengths should be explored in other categories of visual dysfunctions, to understand the neurophysiology underlying the changes on neural activity. Full article
(This article belongs to the Special Issue Towards Upgrade of Visual Evoked Potentials in Basic and Clinical Studies)
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9 pages, 243 KiB  
Article
VEP Score of a Left Eye Had Predictive Values for Achieving NEDA-3 over Ten Years in Patients with Multiple Sclerosis
by Svetlana Miletic-Drakulic, Ivana Miloradovic, Vladimir Jankovic, Ana Azanjac-Arsic and Snezana Lazarevic
Sensors 2022, 22(22), 8849; https://doi.org/10.3390/s22228849 - 16 Nov 2022
Cited by 1 | Viewed by 1687
Abstract
Background: The aim of this study was to determine the predictive value of visual evoked potentials (VEPs) in patients with relapsing–remitting multiple sclerosis (RRMS) in achieving no evidence of disease activity-3 (NEDA-3) during up to 10 years of first-line immunomodulatory therapy and to [...] Read more.
Background: The aim of this study was to determine the predictive value of visual evoked potentials (VEPs) in patients with relapsing–remitting multiple sclerosis (RRMS) in achieving no evidence of disease activity-3 (NEDA-3) during up to 10 years of first-line immunomodulatory therapy and to determine whether the lateralization of optic nerve damage may have prognostic significance concerning clinical disability and response to therapy.Methods: In a retrospective study, a total of 83 patients (53 female and 30 male) with RRMS participated. The average age of patients was 38.31 ± 9.01. Patients were followed for 2, 5 or 10 years. VEPs were measured at the beginning of the follow-up and after many years of monitoring. Data on optical neuritis (ON) were obtained from medical history. The degree of disability was estimated by the neurologist (independent rater), and magnetic resonance (MR) imaging of the endocranium was performed with gadolinium contrasts. Achieving NEDA-3 is considered a favorable outcome of treatments.Results: Among those treated, 19 (22.9%) reached NEDA-3, while 64 (77.1%) did not reach NEDA-3. The values of the evoked potential (EP) score for the left eye (r = 0.008, odds ratio (OR) = 0.344 (0.156–0.757)) and latency for the left eye (r = 0.042, OR = 0.966 (0.934–0.999)) at the onset of disease were predictive factors for achieving NEDA-3. Conclusions: A normal VEP at the beginning of RRMS increases the chance of reaching NEDA-3 by about six times. Full article
(This article belongs to the Special Issue Towards Upgrade of Visual Evoked Potentials in Basic and Clinical Studies)
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