Results 251 to 260 of about 145,950 (305)
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Visual evoked potentials in sarcoidosis
Neurology, 1981The visual evoked potential to pattern reversal was recorded in 50 patients with sarcoidosis. Abnormalities of latency and amplitude were found in 15 patients (30%), including all 4 patients with clinically evident brain disease and 4 of 17 patients with overt ocular disease. Twenty-nine patients had no clinical evidence of ocular or neurologic disease,
L J, Streletz +3 more
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Visual evoked potentials of infants
Revue d&'apos;Electroencéphalographie et de Neurophysiologie Clinique, 1972Resume Les auteurs ont montre dans un travail anterieur que la configuration du P.E.V. chez le nouveaune et chez l'enfant de 3 mois montre une grande var iabilite diurne ; par ailleurs et contrairement au P.E.V. de l'adulte la configuration de ce P.E.V. n'est pas liee au cycle de veille-sommeil.
R J, Ellingson +3 more
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The Multifocal Visual Evoked Potential
Journal of Neuro-Ophthalmology, 2003With the multifocal technique, visual evoked potentials (VEPs) can be recorded simultaneously from many regions of the visual field. For the multifocal VEP (mfVEP), the patient views a display that typically contains 60 sectors, each with a checkerboard pattern.
Donald C, Hood +2 more
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Visual Evoked Potentials in Alcoholics
Clinical Electroencephalography, 1983Visual evoked potentials were obtained in nineteen patients during the early phase of alcohol intoxication. Out of the thirty-eight responses recorded in the nineteen patients, 13% were found to be abnormal (5 responses). Repeated testing was done in all patients with abnormal responses at three to four week intervals following treatment with vitamins ...
I, Ahmed, K S, Hines
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Visual evoked potentials in hemiparkinsonism
Electroencephalography and Clinical Neurophysiology, 1981Abstract Visual evoked potentials (VEPs) were recorded bilaterally from the parietal areas in patients with hemiparkinsonism. VEPs recorded over the hemisphere contralateral to the side of parkinsonian symptomatology showed diminished maximal amplitude of secondary components and increased peak latency of an early positive component (P 100 ). After a
M, Mintz +3 more
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The visually evoked potential in twins
Electroencephalography and Clinical Neurophysiology, 1965Abstract Visually evoked responses were studied in monozygotic and dizygotic twins, triplets and unrelated children age-matched with the monozygotic twins. Scalp leads from occipital and central areas carried EEG activity to an electronic computer (CAT) which was set to sum evoked responses, following 100 flashes of light.
R E, Dustman, E C, Beck
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Biofeedback of Visual Evoked Potentials
International Journal of Neuroscience, 1986The present study investigated the operant conditioning of visual evoked potentials within a latency range between 200 and 600 ms using a visual discrimination task, and scrutinized whether biofeedback-induced potential shifts covaried with behavioral responses (reaction time, RT).
W, Miltner, W, Larbig, C, Braun
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Bulletin de la Societe belge d'ophtalmologie, 1983
Of the cortical potential evoked by visual stimuli several components can be distinguished. A very good example of VEP description was given by Ciganek (1961)/ Fig 4.1).
S. L. Visser +2 more
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Of the cortical potential evoked by visual stimuli several components can be distinguished. A very good example of VEP description was given by Ciganek (1961)/ Fig 4.1).
S. L. Visser +2 more
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Visual evoked potentials in migraine
Neurological Sciences, 2004Migraine is a chronic disorder. Visual symptoms and hypersensitivity to light stimuli are common. The aim of this study is the analysis of visual system in migraineurs by visual evoked potentials (VEP). We studied 53 migraineurs (21 with prophylactic migraine treatment and 32 without preventive therapy) and 20 healthy control subjects.
Spreafico, C +4 more
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Transient visually evoked potential
Journal of the Optical Society of America, 1977A light delivered to the human eye will instigate changes in electrical potentials recorded over the visual cortex that last for some finite time, at least several hundred milliseconds. If the rate of stimulation is sufficiently low, the response is completed before the next visual stimulus arrives; the cortical potential is then called a transient ...
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