Results 211 to 220 of about 2,271,907 (274)
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Reversal in photic orientation in Volvox and the nature of photic stimulation
Zeitschrift f�r Vergleichende Physiologie, 19271. Volvox usually is photopositive in low and photonegative in high illumination, but the opposite obtains under certain conditions. 2. If it is dark adapted, it is always positive when exposed to light, no matter how intense, but it soon becomes negative if the light is sufficiently intense and the higher the intensity the shorter the ...
S. O. Mast
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EFFECT OF PHOTIC STIMULATION ON THE HUMAN MENSTRUAL CYCLE
Photochemistry and Photobiology, 1978Abstract— A theoretical rationale is presented to justify a study of the effect of light on the variability of the menstrual cycle. The experiment consisted of exposure to light all night for several consecutive nights of cycle days 14 through 17, day one being determined by the first day of menses.
John A. Rock +2 more
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The treatment of congenital idiopathic nystagmus by intermittent photic stimulation
Ophthalmic and Physiological Optics, 1983Abstract An analysis is presented of the results obtained by treating 54 patients with congenital nystagmus using intermittent photic stimulation. The major beneficial effect has been to improve the visual acuity, though the nystagmus itself is sometimes reduced in amplitude or even eliminated; an unexpected bonus, in certain cases, is the improvement ...
R. Mallett
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Intensity dependence of sub-harmonics in cortical response to photic stimulation
Journal of Neural Engineering, 2022Objective. Periodic photic stimulation of human volunteers at 10 Hz is known to entrain their electroencephalography (EEG) signals. This entrainment manifests as an increment in power at 10, 20, 30 Hz.
Richa Phogat +2 more
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Journal of Alzheimer's Disease, 2020
Background: Studies on mice models of Alzheimer’s disease (AD) have suggested potential therapeutic benefits of intermittent photic stimulation at 40 Hz.
I. Zibrandtsen, Mikkel Agger, T. Kjaer
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Background: Studies on mice models of Alzheimer’s disease (AD) have suggested potential therapeutic benefits of intermittent photic stimulation at 40 Hz.
I. Zibrandtsen, Mikkel Agger, T. Kjaer
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Spectral analysis of photic stimulation in migraine
Electroencephalography and Clinical Neurophysiology, 1982In seeking an electrophysiologic discriminator of migraine, we applied computer technology to power spectral analysis of the EEG with photic stimulation. In 11 normal volunteers and 11 migraineurs (both classic and common) we were able to classify all migraineurs and misclassified only one normal based on the spectral analysis.
Richard H. Simon +3 more
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Contribution of intermittent photic stimulation to routine EEG
Neurophysiologie Clinique, 2021Intermittent photic stimulation (IPS) is an activation procedure performed during electroencephalography (EEG) to detect photosensitive patients. This procedure is recommended in routine EEGs but the benefit of IPS in the general population is not clearly ascertained.We retrospectively analyzed 7683 EEGs of patients referred for a routine EEG to the ...
Clément Vialatte de Pémille +7 more
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Photic Stimulation and the EEG in Macular Disease
Archives of Ophthalmology, 1964Berger in 1929 discovered what is now known as the a rhythm of the brain. This consists of oscillations of electrical potential at a frequency of 8½ to 12 per second and is best developed in the parieto-occipital region. This rhythm is best demonstrated with the eyes closed, and may be blocked by the subject's attention to vision with the eyes opened ...
Joseph Grader, Grant L. Heller
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American Journal of EEG Technology, 1974
This contribution on photic stimulation is an attempt to stress its clinical value. The efficiency of photic stimulation is very poor if it is used to serve one purpose only, that is, testing a patient's photo convulsive threshold. Photic stimulation can be a much more powerful aid because driving responses make a positive contribution towards a better
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This contribution on photic stimulation is an attempt to stress its clinical value. The efficiency of photic stimulation is very poor if it is used to serve one purpose only, that is, testing a patient's photo convulsive threshold. Photic stimulation can be a much more powerful aid because driving responses make a positive contribution towards a better
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Ictus Emeticus Induced by Photic Stimulation
Clinical Electroencephalography, 1988It has been recently established that ictus emeticus originates from mesial temporal lobe structures. We herein report a patient with generalized epilepsy who exhibited ictus emeticus reflexly triggered by intermittent photic stimulation accompanied by generalized photoparoxysmal responses on the electroencephalogram. All seizures and EEG abnormalities
Daniel E. Jacome +2 more
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