Christof W. Burckhardt

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It has been reported that psychophysical flicker sensitivity, electroretinogram (ERG), pattern electroretinogram (P-ERG), and visual evoked cortical potential (VECP) responses are affected by ocular hypertension and glaucoma. Moreover, it has also been revealed that artificially augmented intraocular pressure (IOP) impairs electrophysiologic responses. In(More)
The flicker sensitivity of the human eye may be characterized by the De Lange curve (temporal modulation transfer function plot). In the curves of two out of eight observers, D. H. Kelly [J. Opt. Soc. Am. 52,940-947 (1962)] found three peaks instead of one, as had been reported in previous publications, and suggested that they are related to the three(More)
The distribution of extracellular and intracellular potential in the sucrose gap apparatus, previously established for a single fiber using the cable equations for a core conductor model (Jirounek and Straub, Biophys. J., 11:1, 1971), is obtained for a multifiber preparation. The exact equation is derived relating the true membrane potential change to the(More)
Es besteht ein Bedarf für einfache billige Mittel zum Austausch graphischer Information zwischen Mensch und Rechner. “Incremental Rate Encoding” besteht in der Quantisierung von Beschleunigung (in x- und y-Richtung) und Zeit während des Entstehens des Zeichens und erlaubt eine besonders sparsame Codierung für die Übertragung und Speicherung von graphischer(More)
An ocular trauma may be followed only by a decrease in visual acuity without any tissular alteration. The measurement of the flicker sensitivity permits to hypothesize that the origin of the disturbance is in the retina itself. We postulate, therefore, the existence of a trauma of the lateral inhibition and we propose the term contusive intraretinal(More)
1 The sensitivity to flickering light at various light frequencies (DeLange curve) was determined in 20 controls and 45 patients receiving maintenance doses of digoxin. 2 Flicker thresholds (mean percentage of maximal light modulation +/- s.d.; F 30 Hz) were 7.6 +/- 1.7 in controls and 9.4 +/- 1.7 in patients with optimal plasma digoxin levels (0.5-1.9(More)
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