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https://www.readbyqxmd.com/read/28821922/homeostatic-plasticity-in-human-extrastriate-cortex-following-a-simulated-peripheral-scotoma
#1
Matthew A Gannon, Stephanie M Long, Nathan A Parks
Neuroimaging and patient work over the past decade have indicated that, following retinal deafferentation, the human visual cortex undergoes a large-scale and enduring reorganization of its topography such that the classical retinotopic organization of deafferented visual cortex remaps to represent non-classical regions of visual space. Such long-term visual reorganization is proposed to occur through changes in the functional balance of deafferented visual circuits that engage more lasting changes through activity-dependent neuroplasticity...
August 18, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28808597/visual-evoked-potentials-in-primary-open-angle-glaucoma
#2
Mukesh Kumar Jha, Dilip Thakur, Nirmala Limbu, Badri Prasad Badhu, Bishnu Hari Paudel
BACKGROUND AND AIMS: Visual evoked potentials (VEPs) assess the integrity of the visual pathways from the optic nerve to the occipital cortex. Optic disc cupping and visual field loss have been associated with prolongation of latency of VEP in primary open angle glaucoma (POAG). METHODS: Pattern reversal and flash VEP tests were done in consenting 20 primary open angle glaucoma eyes and 40 normal control eyes. RESULTS: In POAG cases, the refractive error [3...
2017: Journal of Neurodegenerative Diseases
https://www.readbyqxmd.com/read/28803681/a-survey-on-stimuli-for-visual-cortical-function-assessment-in-infants
#3
REVIEW
Farveh Daneshvarfard, Nasrin Maarefi, Hamid Abrishami Moghaddam, Fabrice Wallois
Visual processing, as a significant and complex functionality of the human brain, changes during the life span with the most developmental changes in the infancy. Different types of visual stimuli are needed for evaluating different functionalities of the infants' visual system. Selecting appropriate visual stimuli is an important issue in evaluating visual cortical functions in infants. Properties of stimulation influence responses of visual system and must be adjusted according to the age and specific function which is going to be investigated...
August 10, 2017: Brain & Development
https://www.readbyqxmd.com/read/28792441/binasal-occlusion-bno-visual-motion-sensitivity-vms-and-the-visually-evoked-potential-vep-in-mild-traumatic-brain-injury-and-traumatic-brain-injury-mtbi-tbi
#4
REVIEW
Kenneth J Ciuffreda, Naveen K Yadav, Diana P Ludlam
The diagnosis and treatment of the possible visual sequelae in those with traumatic brain injury (TBI) represents an important area of health care in this special population. One of their most prevalent yet elusive visual symptoms is visual motion sensitivity (VMS). In this review, we present the basic VMS phenomenon and its related symptoms, clinical studies in the area, clinical research investigations using the visual-evoked potential (VEP) as a cortical probe, and possible mechanisms and related neurophysiology that may underlie VMS...
August 9, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28770364/inter-study-and-inter-individual-consistency-and-variability-of-eeg-erp-microstate-sequences-in-referential-word-production
#5
Marina Laganaro
Periods of stable global electric field at scalp unfolding during a cognitive task can be linked to brain processes and are therefore well suited to investigate simultaneously qualitative and quantitative differences across conditions or populations of interest. The electrophysiological event-related (ERP) spatio-temporal dynamic has been repetitively investigated in referential word production, but the different designs, settings and analyses do not allow to conclude on the reliability of the microstate sequences across studies and individuals...
August 2, 2017: Brain Topography
https://www.readbyqxmd.com/read/28744691/safety-of-intravitreal-clindamycin-in-albino-rabbit-eyes
#6
Zohar Habot-Wilner, Orit Mazza, Jonathan Shahar, Amir Massarweh, Irit Mann, Anat Loewenstein, Ido Perlman
PURPOSE: To study the potential toxic effects of intravitreal clindamycin on the retina of albino rabbits, by assessing functional and morphological retinal changes. METHODS: Eight albino rabbits were included in the study. In each rabbit, 1 mg/0.1 ml clindamycin was injected into the vitreous of the right (experimental) eye, and 0.1 ml saline was injected into the vitreous of the left (control) eye. The electroretinogram (ERG) was recorded before injection, 3 days, 1, 2, and 4 weeks post-injection...
July 25, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28736653/hemispheric-differences-in-electrical-and-hemodynamic-responses-during-hemifield-visual-stimulation-with-graded-contrasts
#7
Juanning Si, Xin Zhang, Yujin Zhang, Tianzi Jiang
A multimodal neuroimaging technique based on electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) was used with horizontal hemifield visual stimuli with graded contrasts to investigate the retinotopic mapping more fully as well as to explore hemispheric differences in neuronal activity, the hemodynamic response, and the neurovascular coupling relationship in the visual cortex. The fNIRS results showed the expected activation over the contralateral hemisphere for both the left and right hemifield visual stimulations...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28729937/manganese-enhanced-magnetic-resonance-imaging-combined-with-electrophysiology-in-the-evaluation-of-visual-pathway-in-experimental-rat-models-with-monocular-blindness
#8
Zuohua Tang, Jie Wang, Zebin Xiao, Xinghuai Sun, Xiaoyuan Feng, Weijun Tang, Qian Chen, Lingjie Wu, Rong Wang, Yufeng Zhong, Wentao Wang, Jianfeng Luo
PURPOSE: Our study aimed to explore the feasibility of manganese-enhanced magnetic resonance imaging (MEMRI) combined with visual evoked potentials (VEP) and auditory evoked visual cortex responses (AVR) in evaluating for the establishment of visual/auditory compensatory pathways after monocular blindness. MATERIALS AND METHODS: A total of 14 healthy neonatal male Sprague-Dawley rats were randomly divided into two groups (n = 7 for Groups A and B). Right optic nerve (ON) transection was performed on the 7 rats of Group A to obtain a monocularly blind model, and the 7 rats of Group B were chosen as the control group...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28694135/characteristics-of-pediatric-multiple-sclerosis-the-turkish-pediatric-multiple-sclerosis-database
#9
Ünsal Yılmaz, Banu Anlar, Kıvılcım Gücüyener
OBJECTIVE: To document the clinical and paraclinical features of pediatric multiple sclerosis (MS) in Turkey. METHODS: Data of MS patients with onset before age 18 years (n = 193) were collected from 27 pediatric neurology centers throughout Turkey. Earlier-onset (<12 years) and later-onset (≥12 years) groups were compared. RESULTS: There were 123 (63.7%) girls and 70 (36.3%) boys aged 4-17 years, median 14 years at disease onset. Family history of MS was 6...
June 29, 2017: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/28691723/effect-of-ethanol-on-the-visual-evoked-potential-in-rat-dynamics-of-on-and-off-responses
#10
Redas Dulinskas, Rokas Buisas, Valentina Vengeliene, Osvaldas Ruksenas
The effect of acute ethanol administration on the flash visual-evoked potential (VEP) was investigated in numerous studies. However, it is still unclear which brain structures are responsible for the differences observed in stimulus onset (ON) and offset (OFF) responses and how these responses are modulated by ethanol. The aim of our study was to investigate the pattern of ON and OFF responses in the visual system, measured as amplitude and latency of each VEP component following acute administration of ethanol...
2017: Acta Neurobiologiae Experimentalis
https://www.readbyqxmd.com/read/28691517/migraine-triggers-and-habituation-of-visual-evoked-potentials
#11
Marco Lisicki, Emiliano Ruiz-Romagnoli, Raúl Piedrabuena, Roberto Giobellina, Jean Schoenen, Delphine Magis
Background Identifying specific subsets of patients within the clinical spectrum of migraine could help in personalizing migraine treatment. Profiling patients by combining clinical characteristics and neurophysiological biomarkers is largely unexplored. We studied the association between migraine attack triggers and habituation of visual evoked potentials. Methods We personally interviewed 25 patients about their migraine triggers following a structured list, and measured the N1-P1 habituation slope over six blocks of 100 averaged pattern-reversal VEP afterwards...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28688625/bilateral-retrobulbar-optic-neuropathy-as-the-only-sign-of-zoledronic-acid-toxicity
#12
Félix Manco Lavado, Marta Para Prieto, María Rosalba Ramoa Osorio, María Isabel López Gálvez, Lucía Manzanas Leal
INTRODUCTION: Bisphosphonates may rarely cause ocular adverse effects and retrobulbar optic neuropathy (RON) secondary to zoledronic acid is very rare. CASE REPORT: A 67-year-old man was referred because of progressive and painless decrease vision in the left eye. He had been treated with 7 cycles of zoledronic acid infusions because of metastatic prostate cancer. On examination, VA was 20/20 in the right eye (OD) and 20/50 in the left eye (OS). The optic nerve was unremarkable OU...
July 5, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28688572/visual-cortex-activation-decrement-following-cochlear-implantation-in-prelingual-deafened-children
#13
Jiahao Liu, Maojin Liang, Yuebo Chen, Yajing Wang, Yuexin Cai, Suijun Chen, Ling Chen, Xianghui Li, Zeheng Qiu, Jiajia Jiang, Junbo Wang, Yiqing Zheng
OBJECTIVE: Visual take-over of the auditory cortex in prelingual deaf children has been widely reported. However, there have been few studies on visual cortex plasticity after cochlear implantation (CI). In this study, we investigated the hypothesis that extrinsic auditory stimulation following CI in prelingual deafened children can induce visual cortex plasticity. METHOD: Visual evoked potentials (VEPs) were recorded in 37 CI children (4 groups with different use times) and 8 control subjects, in response to sound and nonsound stimuli...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28648810/can-somatosensory-and-visual-evoked-potentials-predict-neurological-outcome-during-targeted-temperature-management-in-post-cardiac-arrest-patients
#14
Seung Pill Choi, Kyu Nam Park, Jung Hee Wee, Jeong Ho Park, Chun Song Youn, Han Joon Kim, Sang Hoon Oh, Yoon Sang Oh, Soo Hyun Kim, Joo Suk Oh
PURPOSES: In cardiac arrest patients treated with targeted temperature management (TTM), it is not certain if somatosensory evoked potentials (SEPs) and visual evoked potentials (VEPs) can predict neurological outcomes during TTM. The aim of this study was to investigate the prognostic value of SEPs and VEPs during TTM and after rewarming. METHODS: This retrospective cohort study included comatose patients resuscitated from cardiac arrest and treated with TTM between March 2007 and July 2015...
June 23, 2017: Resuscitation
https://www.readbyqxmd.com/read/28643715/microstructure-changes-of-occipital-white-matter-are-responsible-for-visual-problems-in-the-3-4-year-old-very-low-birth-weight-children
#15
Anna Lesniak, Izabela Herman-Sucharska, Małgorzata Klimek, Paulina Karcz, Anna Kubatko-Zielińska, Magdalena Nitecka, Grażyna Dutkowska, Bożena Romanowska-Dixon, Przemko Kwinta
PURPOSE: The main aim of the study was to evaluate which factors affect the long-time visual function in preterm children, whether it is prematurity or retinopathy of prematurity or perhaps disturbances in the visual pathway. MATERIALS AND METHODS: Fifty-eight children with mean birth weight 1016 g (range 520-1500 g) were evaluated at mean age 48 months (range 42-54 months). All children underwent magnetic resonance imaging (MRI) studies, visual evoked potentials (VEPs), and the Developmental Test of Visual Perception (DTVP)...
June 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28636141/binocular-facilitation-of-cone-specific-visual-evoked-potentials-in-colour-deficiency
#16
Jeff Rabin, Andrew Kryder, Dan Lam
BACKGROUND: Neural compensatory mechanisms have been proposed, which preserve the binocular visual field in glaucoma, as well as cognition in Alzheimer's disease and motor function in Parkinson's disease. It is conceivable that comparable mechanisms operate to preserve function in congenital and/or dystrophic disease. In hereditary colour vision deficiency (CVD), we observed significant facilitation in the amplitude of the binocular cone-specific visual evoked potential (VEP) compared to the monocular amplitude for the cone type corresponding to the CVD...
June 21, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28626779/optical-coherence-tomography-and-visual-evoked-potentials-in-pediatric-ms
#17
Amy T Waldman, Grant T Liu, Amy M Lavery, Geraldine Liu, William Gaetz, Tomas S Aleman, Brenda L Banwell
OBJECTIVE: To determine the relative ability of optical coherence tomography (OCT) and pattern-reversal visual evoked potentials (pVEPs) to detect visual pathway involvement in pediatric-onset MS. METHODS: Pediatric-onset MS participants (onset <18 years) and healthy controls (HCs) underwent OCT (Cirrus HD-OCT) and pVEPs. Retinal nerve fiber layer (RNFL), ganglion cell layer to inner plexiform layer (GCL-IPL), and P100 pVEP latency were measured. Generalized estimating equation models were used to compare the groups, adjusting for age and intereye correlations...
July 2017: Neurology® Neuroimmunology & Neuroinflammation
https://www.readbyqxmd.com/read/28612321/the-changing-shape-of-the-iscev-standard-pattern-onset-vep
#18
Dorothy A Thompson, Dennis M Fritsch, Sharon E Hardy
PURPOSE: Pattern onset VEPs do not always show distinct C1-C2-C3 peaks and troughs. Our purpose was to study changes in pattern onset VEP with age to determine when the illustrated ISCEV standard onset VEP waveform can be reliably recorded. METHODS: We recorded pattern onset VEPs from an Oz electrode referred to mid-frontal electrode according to ISCEV standards by presenting checks of 60' and 15' side length in a 15° field. Twenty-four adults aged 20-63 years participated...
August 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28587604/kcnj11-abcc8-and-tcf7l2-polymorphisms-and-the-response-to-sulfonylurea-treatment-in-patients-with-type-2-diabetes-a-bioinformatics-assessment
#19
Jingwen Song, Yunzhong Yang, Franck Mauvais-Jarvis, Yu-Ping Wang, Tianhua Niu
BACKGROUND: Type 2 diabetes (T2D) is a worldwide epidemic with considerable health and economic consequences. Sulfonylureas are widely used drugs for the treatment of patients with T2D. KCNJ11 and ABCC8 encode the Kir6.2 (pore-forming subunit) and SUR1 (regulatory subunit that binds to sulfonylurea) of pancreatic β cell KATP channel respectively with a critical role in insulin secretion and glucose homeostasis. TCF7L2 encodes a transcription factor expressed in pancreatic β cells that regulates insulin production and processing...
June 6, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/28570867/evoked-potentials-recorded-during-routine-eeg-predict-outcome-after-perinatal-asphyxia
#20
Päivi Nevalainen, Viviana Marchi, Marjo Metsäranta, Tuula Lönnqvist, Sanna Toiviainen-Salo, Sampsa Vanhatalo, Leena Lauronen
OBJECTIVE: To evaluate the added value of somatosensory (SEPs) and visual evoked potentials (VEPs) recorded simultaneously with routine EEG in early outcome prediction of newborns with hypoxic-ischemic encephalopathy under modern intensive care. METHODS: We simultaneously recorded multichannel EEG, median nerve SEPs, and flash VEPs during the first few postnatal days in 50 term newborns with hypoxic-ischemic encephalopathy. EEG background was scored into five grades and the worst two grades were considered to indicate poor cerebral recovery...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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