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J F Legargasson

Publications and source records attributed to J F Legargasson.

5 recordsLinked to original sources

Data processing software for electrophysiological visual exploration.

The software we have developed originated after careful study of a routine functional visual processing session. It has three objectives: (i) to have available a large library of data processing programs; (ii) to add to these electrophysiological results, automatically transferred into a file, a clinical record card, creating a personalized file for study of visual characteristics of each patient; (iii) to allow programs providing statistical studies, creation of groups based on the same clinical features and various comparisons between files or groups. The database now contains 5000 different files and the results of its use are very encouraging. Some results are presented, especially those of a study on multiple sclerosis. The goal of the operation is the creation, in the future, of an expert system.

Clinical Laboratory Information Systems

Correlation functions in the analysis of visual evoked potentials.

Our "vision" laboratory has been working for several years on stimulation methods and data processing. We present here the results of an analysis of correlation functions between VEPs obtained by flashes and patterned stimulations. This study provides additional information about possible interpretations.

Evoked Potentials, Visual

[Methods of stimulation in visual electrophysiology].

After introducing physical and physiological stimulation parameters, the authors present different techniques and discuss their clinical usefulness for the investigation of the visual system: flashes: chiefly 'ganzfeld' stimulators (whole field or local stimulation). A solution using optic fibres incorporated in a sclero-corneal electrode built in our laboratory is presented; patterns: bars or chekerboards, especially on TV screens. Advantages and inconveniences of video images are discussed; other techniques: essentially endocular laser interference fringes, electrical stimulations, high level flashes for ERP and binocular studies, particularly dynamic random dot pattern EVP. In conclusion, the necessity for the careful control of stimulation characteristics and for a strategy suitable for clinical examination is discussed.

Brain