Quantification and calibration of flash stimuli in clinical research.
Despite the relatively wide use of flash-type stimuli in VEP studies, no universally accepted standards or methods of measurement for these stimuli are in existence. Several methods have been described for the determination of flash-intensities, however, the majority of these methods are not sufficiently rigorous, or are based on overly optimistic assumptions on the ideal nature of flash-stimulators. We describe here a simple method for the determination of flash-stimulus energies and absolute peak intensities. Our method does not require specialized optometric instrumentation, and should be readily adaptable to any modern laboratory.
Eskola
H
H
Department of Clinical Neurophysiology, University Hospital of Tampere, Finland.
Häkkinen
V K
VK
Mäkelä
K
K
Rantanen
K
K
D002138:Calibration; D004596:Electroretinography; D005074:Evoked Potentials, Visual; D006801:Humans; D008027:Light; D010775:Photic Stimulation