Effects of long-term meditation on cognition, electroencephalography and visual evoked potentials derived brain dynamics: A cross-sectional comparative study

2021 ◽  
Vol 429 ◽  
pp. 117682
Author(s):  
Kumarangie Vithanage ◽  
Thashi Chang ◽  
Dilshani Dissanayake
Keyword(s):  
Comparative Study ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Brain Dynamics ◽  
Cross Sectional ◽  
Visual Evoked

scholarly journals Visual Evoked Potentials in Operated Primary Congenital Glaucoma: A Cross-Sectional Comparative Study

2021 ◽  
Vol Volume 15 ◽  
pp. 2375-2382
Author(s):  
Mai A Mohammed ◽  
Mohamed Saad Morsy ◽  
Nashwa Shehata Zeater ◽  
Nader Bayoumi
Keyword(s):  
Comparative Study ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Congenital Glaucoma ◽  
Cross Sectional ◽  
Primary Congenital Glaucoma ◽  
Visual Evoked

Neurophysiological and morphological effects in the post-exposure vibration period during experimental modeling

2019 ◽  
pp. 284-290
Author(s):  
Natalya L. Yakimova ◽  
Vladimir A. Pankov ◽  
Aleksandr V. Lizarev ◽  
Viktor S. Rukavishnikov ◽  
Marina V. Kuleshova ◽  
...  
Keyword(s):  
Nervous System ◽  
Evoked Potentials ◽  
Experimental Model ◽  
Visual Evoked Potentials ◽  
The Body ◽  
Behavioral Activity ◽  
Contact Period ◽  
Vibration Exposure ◽  
Visual Evoked

Introduction. Vibration disease continues to occupy one of the leading places in the structure of professional pathology. In workers after the termination of contact with vibration generalization and progression of violations in an organism is noted. The pathogenetic mechanisms of the progredient course of disturbances in the nervous system in the post-contact period of vibration exposure remain insufficiently studied.The aim of the study was to test an experimental model of vibration exposure to assess the neurophysiological and morphological effects of vibration in rats in the dynamics of the post-contact period.Materials and methods. The work was performed on 168 white male outbred rats aged 3 months weighing 180–260 g. The vibration effect was carried out on a 40 Hz vibrating table for 60 days 5 times a week for 4 hours a day. Examination of animals was performed after the end of the physical factor, on the 30th, 60th and 120th day of the post-contact period. To assess the long-term neurophysiological and morphofunctional effects of vibration in rats, we used indicators of behavioral reactions, bioelectric activity of the somatosensory zone of the cerebral cortex, somatosensory and visual evoked potentials, parameters of muscle response, morphological parameters of nervous tissue.Results. In the dynamics of the post-contact period observed the preservation of violations of tentatively research, motor and emotional components of behavior. In the Central nervous system instability of activity of rhythms of an electroencephalogram, decrease in amplitude of visual evoked potentials, lengthening of latency of somatosensory evoked potentials, decrease in total number of normal neurons and astroglia is established. In the peripheral nervous system remained changes in indicators: increasing duration and latency, reducing the amplitude of the neuromuscular response.Conclusions: The experimental model allows us to study the long-term neurophysiological and morphological effects of vibration on the body. The formation and preservation of changes in behavioral activity, neurophysiological and morphological effects of vibration from the 30th to the 120th day of the post-contact period were confirmed.

Functional assessment of the visual pathway with multifocal visual evoked potentials, and their relationship with disability in patients with multiple sclerosis

2013 ◽  
Vol 20 (2) ◽  
pp. 183-191 ◽  
Author(s):  
Román Blanco ◽  
Consuelo Pérez-Rico ◽  
Inmaculada Puertas-Muñoz ◽  
Lucía Ayuso-Peralta ◽  
Luciano Boquete ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Probability Analysis ◽  
Optic Coherence Tomography ◽  
Cross Sectional ◽  
Multifocal Visual Evoked Potentials ◽  
Humphrey Perimetry ◽  
Edss Score ◽  
Visual Evoked

Objective: To objectively evaluate the visual function, and the relationship between disability and optic nerve dysfunction, in patients with multiple sclerosis (MS) and optic neuritis (ON), using multifocal visual evoked potentials (mfVEP). Methods: This observational, cross-sectional study assessed 28 consecutive patients with clinically definite MS, according to the McDonald criteria, and 19 age-matched healthy subjects. Disability was recorded using the Expanded Disability Status Scale (EDSS) score. The patients’ mfVEP were compared to their clinical, psychophysical (Humphrey perimetry) and structural (optic coherence tomography (OCT)) diagnostic test data. Results: We observed a significant agreement between mfVEP amplitude and Humphrey perimetry/OCT in MS-ON eyes, and between mfVEP amplitude and OCT in MS but non-ON eyes. We found significant differences in EDSS score between patients with abnormal and normal mfVEP amplitudes. Abnormal mfVEP amplitude defects (from interocular and monocular probability analysis) were found in 67.9% and 73.7% of the MS-ON and MS-non-ON group eyes, respectively. Delayed mfVEP latencies (interocular and monocular probability analysis) were seen in 70.3% and 73.7% of the MS-ON and MS-non-ON groups, respectively. Conclusions: We found a significant relationship between mfVEP amplitude and disease severity, as measured by EDSS score, that suggested there is a role for mfVEP amplitude as a functional biomarker of axonal loss in MS.

scholarly journals Long-Term Visuo-Gustatory Appetitive and Aversive Conditioning Potentiate Human Visual Evoked Potentials

2017 ◽  
Vol 11 ◽  
Author(s):  
Gert R. J. Christoffersen ◽  
Jakob L. Laugesen ◽  
Per Møller ◽  
Wender L. P. Bredie ◽  
Todd R. Schachtman ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Aversive Conditioning ◽  
Visual Evoked

scholarly journals Gender based normative values of pattern-reversal visual evoked potentials in school age children

2018 ◽  
Vol 9 (5) ◽  
pp. 175
Author(s):  
Sanjay Maharjan ◽  
Rita Khadka ◽  
Bishnu Hari Poudel ◽  
Nisha Ghimire ◽  
Kopila Agrawal ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Cross Sectional Study ◽  
School Age Children ◽  
Normative Values ◽  
Pattern Reversal ◽  
Cross Sectional ◽  
Biological Variables ◽  
Vep Latency ◽  
Visual Evoked

Background: Male and female brain develops differently. Gender is one of biological variables that influence visual evoked potentials (VEP). Some previous studies support the existence of sex related VEP difference while others not. This study is an attempt to explore if any difference exists in VEP responses between genders of children age seven to 10 years with an additional aim of documenting preliminary normative VEP data.Methods: This cross-sectional study was done on consenting children taken from parents (n=76; girls, n=41, age = 8.39±1.11years; boys, n=35, age =8.40±1.09 years). Pattern reversal VEP of these children was recorded as per standard method. Latencies of N75, P100, and N145 (ms); amplitude of P100 (μV) and ratio; interocular asymmetry (ms) of both eyes were calculated. Unpaired t-test was applied for statistical analysis. Ethical clearance was obtained prior to the study.  Result: Girls had decreased VEP latency of P100 than boys in left eye (108.15±8.42 vs. 112.71±11.17ms, p = 0.046), in right eye (107.71±8.52 vs. 114.46±10.98 ms, p = 0.004), and in combination of both eyes (107.92±8.07 vs. 113.58±10.36 ms, p = 0.009). Likewise, girls had decreased VEP latency of N75 than boys in right eye (67.44±6.77 vs. 71.29±8.07 ms, p = 0.027) and in combined eyes (67.23±5.19 vs. 70.14±7.31 ms, p = 0.047). A gender difference in P100 amplitude was not detected.Conclusion: Visual evoked potential differs with gender in prepubertal children aged seven to 10 years.

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