Summary
The spectral sensitivity of the visual system of man during selective chromatic adaptation was determined. The criterion was an off-response of constant amplitude in the evoked cortical potential. Criterion of height of response differed among the subjects investigated. Generally, a pupillary radiant intensity between 0.4 and 1.0 lg unit above the sensory threshold was used.
With stimulation of both the green- and the red-sensitive mechanism, the sensitivity of the off-response was low. It was high if either the green or the red mechanism were suppressed by selective chromatic adaptation. Demonstration of an opponent color mechanism in the visual system was easier with recording of the off-response in the VECP than with determination of the sensory threshold.
The presence of the blue-sensitive mechanism as revealed by the VECP off-response was shown for light stimuli near the sensory threshold during adaptation which orange and red light for a late response of low amplitude.
Zusammenfassung
Die spektrale Empfindlichkeit des visuellen Systems wurde beim Menschen unter verschiedenfarbiger Adaptation untersucht. Kriterium war eine konstante Amplitude der off-Antwort im VECP. Die Höhe der Kriteriumamplitude war für die untersuchten Personen verschieden. Sie lag allgemein bei einer Pupillenstrahlstärke zwischen 0,4 und 1,0 lg Einheiten oberhalb der sensorischen Schwelle.
Eine gegenseitige Hemmung zwischen dem grünempfindlichen und dem rotempfindlichen Mechanismus wurde immer dann beobachtet, wenn beide Mechanismen ungefähr gleich aktiviert wurden. Dagegen war die off-Antwort groß, wenn durch farbige Adaptation entweder vorwiegend der grünempfindliche oder der rotempfindliche Mechanismus unterdrückt wurde. Der Nachweis von Gegenfarbmechanismen gelang leichter bei Registrierung der off-Antworten im VECP als bei Bestimmung der sensorischen Schwelle.
Eine Darstellung des Blaumechanismus im off-VECP gelang während Adaptation mit roten und orangefarbigen Lichtern bei Verwendung schwellennaher Reize für eine späte Antwort geringer Amplitude.
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Jankov, E. Spektralsensitivität der off-Antwort im menschlichen VECP bei verschiedenfarbiger Adaptation. Albrecht von Graefes Arch. Klin. Ophthalmol. 206, 121–133 (1978). https://doi.org/10.1007/BF00414620
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DOI: https://doi.org/10.1007/BF00414620