Pétrault Olivier

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The purpose of this study was to examine the dose related effects of 6-hydroxydopamine (6-OHDA) on the electroretinographic (ERG) B-wave amplitude and on retinal concentrations of dopamine (DA) and its main metabolites homovanillic acid (HVA) and dihydroxyphenylacetic acid (DOPAC). Doses of 6-OHDA (60, 300 or 1200 micrograms) were dissolved in a 0.9 percent(More)
The absence of sensory adaptations in patients who have an esotropia of 12 to 18 degrees constitutes what has been described as the blind spot syndrome. Here, the physiological blind spot is said to provide the means of avoiding diplopia and confusion. The small size of the optic disc and variations of the angle of deviation at different positions of gaze(More)
Two series of experiments are reported on incremental increases of ischemia and monitoring of recovery from total ischemia of varying duration. In the first, rods show hyper-responses and cones do not; changes in amplitude and delays appear at higher levels of ischemia in cones than they do in rods. In the second series, cones do not recover up to control(More)
The Maddox double rod test showed subjective excyclotropia of the nonparetic eye in 15 of 60 patients with unilateral superior oblique muscle palsy. This response was reported consistently by patients who habitually fixated with the paretic eye. This phenomenon is the results of a monocular sensorial adaptation to the cyclodeviation by means of a reordering(More)
Since an ethical issue has been raised regarding the use of the well-known anesthetic agent chloral hydrate, owing to its mutagenic and carcinogenic effects in animals, attention of neuroscientists has turned to finding out an alternative agent able to meet not only potency, safety, and analgesic efficacy, but also reduced neuroprotective effect for stroke(More)
The authors report a patient with unilateral painful hand and moving finger in whom tactile stimulation interrupted both the movement and the pain. This effect suggests a gating mechanism at a segmental level. The difference between afferent and efferent pathway levels and the delay of several months between trauma and occurrence of symptoms support a(More)
The purpose of the present study was to evaluate the electroretinophysiological effects of streptozotocin-induced diabetes in the rat. More specifically, both B wave amplitudes and implicit times generated with various intensities of light stimulation were examined in diabetic animals adapted to either scotopic or photopic conditions. Results indicate that(More)
We have observed an increase in time to peak and a decrease in amplitude for both the pattern electroretinogram (PERG) and the electroretinogram (ERG) in pigeons following an elevation in intraocular pressure (IOP). The changes in PERG were highly correlated to the changes in ERG. However, they differed in that significant changes from baseline values(More)
The response time is an extremely important element of the clinical electroretinogram (ERG) with respect to the recording's clinical interpretation. It is related to the intensity of stimulation. A series of simple experiments was devised in which light penetration to the retina was impaired. We expected simple and straightforward results, with all(More)
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