“Empfindungszeit” of an Electrical Phosphene and That of a Light Stimulus
Dark-adapted Eye
1950 Volume 53 Issue 1-2 Pages 1-9
Details
1950 Volume 53 Issue 1-2 Pages 1-9
The “E. Z.'s” of the electrical phosphene and of light for fovea and periphery were studied. in the dark adaptation of three subjects.
The maximum “E. Z.'s” were 180 msec, -189.2 msec. for foveal vision, 304 msec., 280 msec. and 357, 8 msec. for peripheral vision at 50°, 30° and 5° respectively, and 1.75.4 msec.-178.0 msec. for electrical stimula-tion.
The minimum “E. Z.'s” were 64.7 msec.-69.3 msec. for the foveal vision, and 60.0-72.7 msec. for electrical stimulation.
The “E. Z.'s” of the electrical phosphene coincides fairly well with that of light for the fovea with respect to their maximum and minimum values and to the course of “E. Z.'s”-intensity-curves, while it differs entirely from the “E. Z.'s” of light for the periphery.
The cones are the most sensitive element of the retina to electrical stimulation and also respond to it with the greatest rapidity. Therefore an electric stimulus can reveal mainly the effect on the cones even in the dark adaptation.
