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https://www.readbyqxmd.com/read/28327351/parkinson-s-patients-can-rely-on-perspective-cues-to-perceive-3d-space
#1
Alexandra Séverac Cauquil, Fabienne Ory-Magne, Vincent Jardiné, Monique Galitzky, Maxime Rosito, Christine Brefel-Courbon, Simona Celebrini
3D perception, which is necessary for an optimal navigation in our environment, relies on 2 complementary kinds of cues; binocular cues allowing precise depth localization near the point of visual interest and monocular ones that are necessary for correct global perception of visual space. Recent studies described deficient binocular 3D vision in PD patients; here we tested 3D vision in PD patients when based on monocular cues (m3D). Sixteen PD patients and 16 controls had to categorize visual stimuli as perceived in 2D (flat) or 3D (with depth)...
March 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28324945/a-comparative-study-of-pseudorandom-sequences-used-in-a-c-vep-based-bci-for-online-wheelchair-control
#2
Jonas Isaksen, Ali Mohebbi, Sadasivan Puthusserypady
In this study, a c-VEP based BCI system was developed to run on three distinctive pseudorandom sequences, namely the m-code, the Gold-code, and the Barker-code. The Visual Evoked Potentials (VEPs) were provoked using these codes. In the online session, subjects controlled a LEGO(®) Mindstorms(®) robot around a fixed track. Choosing the optimal code proved a significant increase in accuracy (p<;0.00001) over the average performance. No single code proved significantly more accurate than the others (p=0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28291207/-functional-examinations-of-visual-channels-physiological-basis
#3
M V Zueva, I V Tsapenko, E P Lantukh, N M Maglakelidze
In this paper, technical details of visual evoked potentials (VEP) assessment and pattern electroretinography (PERG) are reviewed. Both methods are used to perform an objective functional examination of visual channels and to clarify the level, at which they have been damaged. Contributions of parvo- (P), magno- (M) and koniocellular (K) systems to the morphology of PERG and VEP responses are discussed with account to test conditions, selectively supportive of the activity of particular cell populations. The review analyzes the physiological role of such stimulation parameters as brightness and color contrast of the pattern elements as well as spatial and temporal frequency in detecting dysfunction of color channels and mistuning of the P- and M- pathways...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28283099/sensitivity-of-visual-evoked-potentials-and-spectral-domain-optical-coherence-tomography-in-early-relapsing-remitting-multiple-sclerosis
#4
COMPARATIVE STUDY
Raed Behbehani, Samar Ahmed, Jasem Al-Hashel, Rossen T Rousseff, Raed Alroughani
BACKGROUND: Visual evoked potentials and spectral-domain optical coherence tomography are common ancillary studies that assess the visual pathways from a functional and structural aspect, respectively. OBJECTIVE: To compare prevalence of abnormalities of Visual evoked potentials (VEP) and spectral-domain optical coherence tomography (SDOCT) in patients with relapsing remitting multiple sclerosis (RRMS). METHODS: A cross-sectional study of 100 eyes with disease duration of less than 5 years since the diagnosis...
February 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28281303/long-chain-polyunsaturated-fatty-acid-supplementation-in-infants-born-at-term
#5
REVIEW
Bonny Jasani, Karen Simmer, Sanjay K Patole, Shripada C Rao
BACKGROUND: The long chain polyunsaturated fatty acids (LCPUFA) docosahexaenoic acid (DHA) and arachidonic acid (AA) are considered essential for maturation of the developing brain, retina and other organs in newborn infants. Standard infant milk formulae are not supplemented with LCPUFA; they contain only alpha-linolenic acid and linoleic acid, from which formula-fed infants must synthesise their own DHA and AA, respectively. Over the past few years, some manufacturers have added LCPUFA to formula milk and have marketed these products as providing an advantage for the overall development of full-term infants...
March 10, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28268607/neural-decoding-of-code-modulated-visual-evoked-potentials-by-spatio-temporal-inverse-filtering-for-brain-computer-interfaces
#6
Jun-Ichi Sato, Yoshikazu Washizawa
This study addresses neural decoding of a code modulated visual evoked potentials (c-VEPs). c-VEP was recently developed, and applied to brain computer interfaces (BCIs). c-VEP BCI exhibits faster communication speed than existing VEP-based BCIs. In c-VEP BCI, the canonical correlation analysis (CCA) that maximizes the correlation between an averaged signal and single trial signals is often used for the spatial filter. However, CCA does not utilize information of given PN sequence, and hence, the filtered signal may not have properties of PN sequence...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28251085/short-duration-transient-visual-evoked-potentials-and-color-reflectivity-discretization-analysis-in-glaucoma-patients-and-suspects
#7
Michael Waisbourd, Rebekah H Gensure, Ardalan Aminlari, Sonya B Shah, Nitasha Khanna, Neil Sood, Jeanne Molineaux, Alberto Gonzalez, Jonathan S Myers, L Jay Katz
AIM: To evaluate the use of short-duration transient visual evoked potentials (VEP) and color reflectivity discretization analysis (CORDA) in glaucomatous eyes, eyes suspected of having glaucoma, and healthy eyes. METHODS: The study included 136 eyes from 136 subjects: 49 eyes with glaucoma, 45 glaucoma suspect eyes, and 42 healthy eyes. Subjects underwent Humphrey visual field (VF) testing, VEP testing, as well as peripapillary retinal nerve fiber layer optical coherence tomography imaging studies with post-acquisition CORDA applied...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28245274/visual-steady-state-in-relation-to-age-and-cognitive-function
#8
Anna Horwitz, Mia Dyhr Thomsen, Iris Wiegand, Henrik Horwitz, Marc Klemp, Miki Nikolic, Lene Rask, Martin Lauritzen, Krisztina Benedek
Neocortical gamma activity is crucial for sensory perception and cognition. This study examines the value of using non-task stimulation-induced EEG oscillations to predict cognitive status in a birth cohort of healthy Danish males (Metropolit) with varying cognitive ability. In particular, we examine the steady-state VEP power response (SSVEP-PR) in the alpha (8Hz) and gamma (36Hz) bands in 54 males (avg. age: 62.0 years) and compare these with 10 young healthy participants (avg. age 27.6 years). Furthermore, we correlate the individual alpha-to-gamma difference in relative visual-area power (ΔRV) with cognitive scores for the older adults...
2017: PloS One
https://www.readbyqxmd.com/read/28229892/safety-and-efficacy-of-opicinumab-in-acute-optic-neuritis-renew-a-randomised-placebo-controlled-phase-2-trial
#9
Diego Cadavid, Laura Balcer, Steven Galetta, Orhan Aktas, Tjalf Ziemssen, Ludo Vanopdenbosch, Jette Frederiksen, Mark Skeen, Glenn J Jaffe, Helmut Butzkueven, Focke Ziemssen, Luca Massacesi, Yi Chai, Lei Xu, Stefanie Freeman
BACKGROUND: The human monoclonal antibody opicinumab (BIIB033, anti-LINGO-1) has shown remyelinating activity in preclinical studies. We therefore assessed the safety and tolerability, and efficacy of opicinumab given soon after a first acute optic neuritis episode. METHODS: This randomised, double-blind, placebo-controlled, phase 2 study (RENEW) was done at 33 sites in Australia, Canada, and Europe in participants (aged 18-55 years) with a first unilateral acute optic neuritis episode within 28 days from study baseline...
March 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28226793/a-comparative-study-of-pseudorandom-sequences-used-in-a-c-vep-based-bci-for-online-wheelchair-control
#10
Jonas Isaksen, Ali Mohebbi, Sadasivan Puthusserypady, Jonas Isaksen, Ali Mohebbi, Sadasivan Puthusserypady, Jonas Isaksen, Sadasivan Puthusserypady, Ali Mohebbi
In this study, a c-VEP based BCI system was developed to run on three distinctive pseudorandom sequences, namely the m-code, the Gold-code, and the Barker-code. The Visual Evoked Potentials (VEPs) were provoked using these codes. In the online session, subjects controlled a LEGO(®) Mindstorms(®) robot around a fixed track. Choosing the optimal code proved a significant increase in accuracy (p<;0.00001) over the average performance. No single code proved significantly more accurate than the others (p=0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226786/neural-decoding-of-code-modulated-visual-evoked-potentials-by-spatio-temporal-inverse-filtering-for-brain-computer-interfaces
#11
Jun-Ichi Sato, Yoshikazu Washizawa, Jun-Ichi Sato, Yoshikazu Washizawa, Jun-Ichi Sato, Yoshikazu Washizawa
This study addresses neural decoding of a code modulated visual evoked potentials (c-VEPs). c-VEP was recently developed, and applied to brain computer interfaces (BCIs). c-VEP BCI exhibits faster communication speed than existing VEP-based BCIs. In c-VEP BCI, the canonical correlation analysis (CCA) that maximizes the correlation between an averaged signal and single trial signals is often used for the spatial filter. However, CCA does not utilize information of given PN sequence, and hence, the filtered signal may not have properties of PN sequence...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225794/a-high-speed-brain-computer-interface-bci-using-dry-eeg-electrodes
#12
Martin Spüler
Recently, brain-computer interfaces (BCIs) based on visual evoked potentials (VEPs) have been shown to achieve remarkable communication speeds. As they use electroencephalography (EEG) as non-invasive method for recording neural signals, the application of gel-based EEG is time-consuming and cumbersome. In order to achieve a more user-friendly system, this work explores the usability of dry EEG electrodes with a VEP-based BCI. While the results show a high variability between subjects, they also show that communication speeds of more than 100 bit/min are possible using dry EEG electrodes...
2017: PloS One
https://www.readbyqxmd.com/read/28208777/development-and-experimental-validation-of-a-dry-non-invasive-multi-channel-mouse-scalp-eeg-sensor-through-visual-evoked-potential-recordings
#13
Donghyeon Kim, Chanmi Yeon, Kiseon Kim
In this paper, we introduce a dry non-invasive multi-channel sensor for measuring brainwaves on the scalps of mice. The research on laboratory animals provide insights to various practical applications involving human beings and other animals such as working animals, pets, and livestock. An experimental framework targeting the laboratory animals has the potential to lead to successful translational research when it closely resembles the environment of real applications. To serve scalp electroencephalography (EEG) research environments for the laboratory mice, the dry non-invasive scalp EEG sensor with sixteen electrodes is proposed to measure brainwaves over the entire brain area without any surgical procedures...
February 9, 2017: Sensors
https://www.readbyqxmd.com/read/28206829/validity-of-low-contrast-letter-acuity-as-a-visual-performance-outcome-measure-for-multiple-sclerosis
#14
Laura J Balcer, Jenelle Raynowska, Rachel Nolan, Steven L Galetta, Raju Kapoor, Ralph Benedict, Glenn Phillips, Nicholas LaRocca, Lynn Hudson, Richard Rudick
Low-contrast letter acuity (LCLA) has emerged as the leading outcome measure to assess visual disability in multiple sclerosis (MS) research. As visual dysfunction is one of the most common manifestations of MS, sensitive visual outcome measures are important in examining the effect of treatment. Low-contrast acuity captures visual loss not seen in high-contrast visual acuity (HCVA) measurements. These issues are addressed by the MS Outcome Assessments Consortium (MSOAC), including representatives from advocacy organizations, Food and Drug Administration (FDA), European Medicines Agency (EMA), National Institute of Neurological Disorders and Stroke (NINDS), academic institutions, and industry partners along with persons living with MS...
February 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28203210/auditory-and-visual-electrophysiology-of-deaf-children-with-cochlear-implants-implications-for-cross-modal-plasticity
#15
David P Corina, Shane Blau, Todd LaMarr, Laurel A Lawyer, Sharon Coffey-Corina
Deaf children who receive a cochlear implant early in life and engage in intensive oral/aural therapy often make great strides in spoken language acquisition. However, despite clinicians' best efforts, there is a great deal of variability in language outcomes. One concern is that cortical regions which normally support auditory processing may become reorganized for visual function, leaving fewer available resources for auditory language acquisition. The conditions under which these changes occur are not well understood, but we may begin investigating this phenomenon by looking for interactions between auditory and visual evoked cortical potentials in deaf children...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28197086/distinct-neural-signatures-for-very-small-and-very-large-numerosities
#16
Michele Fornaciai, Joonkoo Park
Behavioral studies of numerical cognition have shown that perceptual threshold for numerosity discrimination depends on the range of numerical values to be estimated. Discrimination threshold is constant when comparing very small numerosities via the mechanism called subitizing, while it increases as a function of numerosity for numbers beyond that range governed by subitizing. However, when numerosity gets so large that the individual elements start to form a cluttered ensemble, discrimination threshold increases as a function of the square root of numerosity...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28181909/visual-evoked-potentials-in-diagnostics-of-optic-neuropathy-associated-with-renal-failure
#17
Małgorzata Jurys, Sebastian Sirek, Aureliusz Kolonko, Dorota Pojda-Wilczek
Chronic renal failure is associated with many neurological complications. Due to accumulation of uremic neurotoxins axonal degeneration with its secondary demyelination occurs, which results in development of polineuropathy in 60‑100% of patients with chronic renal failure. One of the most severe peripheral neuropathy is optic neuropathy. It is associated with visual deterioration and reduction in quality of life. Symptoms of the optic neuropathy may appear either before or after dialysis therapy. They often worsen after renal transplant, probably due to immunosuppressive regimen...
January 22, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28165438/morphologic-differences-of-occipital-region-in-patients-with-schizophrenia-and-migraine-headache-using-magnetic-resonance-imaging-mri-and-visual-evoked-potentials-veps
#18
Gorana Sulejmanpašić, Saida Fišeković, Senad Drnda
Aim To compare morphologic variations of occipital sulci patterns in patients with schizophrenia and migraine headache regarding gender and laterality using magnetic resonance imaging (MRI) and visual evoked potentials (VEPs) as well as damage of visual pathway in patients with schizophrenia. Methods This study included 80 patients. Brain scans and visual evoked potential responses recorded over the occipital cortex were performed to analyze the occipital region of both hemispheres. Average total volumes of both hemispheres and average values of latency of the healthy population were used for comparison...
February 1, 2017: Medicinski Glasnik
https://www.readbyqxmd.com/read/28163503/pattern-reversal-visual-evoked-potential-and-cognitive-functions-in-subclinical-hypothyroid-subjects
#19
Pooja Jaiswal, Yogesh Saxena, Rani Gupta, Rajeev Mohan Kaushik
BACKGROUND: Central nervous system (CNS) involvement is insidious and may occur early in subclinical hypothyroid (SCH) state which can be picked up by electrophysiological study. This study aims to record visual evoked potential (VEP), event-related latency and cognitive functions, and find their association with the levels of serum thyroid-stimulating hormone (TSH) in patients with SCH. MATERIALS AND METHODS: In this cross-sectional study, 36 adult SCH patients and an equal number of age- and sex-matched euthyroid controls were included...
December 2016: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28155841/reference-layer-adaptive-filtering-rlaf-for-eeg-artifact-reduction-in-simultaneous-eeg-fmri
#20
David Steyrl, Gunther Krausz, Karl Koschutnig, Günter Edlinger, Gernot R Müller-Putz
OBJECTIVE: Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) combines advantages of both methods, namely high temporal resolution of EEG and high spatial resolution of fMRI. However, EEG quality is limited due to severe artifacts caused by fMRI scanners. APPROACH: To improve EEG data quality substantially, we introduce methods that use a reusable reference layer EEG cap prototype in combination with adaptive filtering. The first method, reference layer adaptive filtering (RLAF), uses adaptive filtering with reference layer artifact data to optimize artifact subtraction from EEG...
April 2017: Journal of Neural Engineering
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