Brightness fading during Ganzfeld adaptation.
The time course and extent of brightness fading in a Ganzfeld were determined for adapting luminances ranging from 0.01 to 100 cd/m2. Magnitude estimation and interocular brightness matching were used. During Ganzfeld adaptation, perceived brightness decreased slowly and leveled off, on average, after 5-7 min (adapting time increasing with luminance). On average, the total brightness loss was equivalent to a 1.2 log unit reduction in luminance, independent of adapting luminance. The residual brightness perceived at the final plateau was generally higher than the brightness of the Eigengrau, suggesting a partially sustained luminance channel.
Knau
H
H
Institute of Biophysics and Radiation Biology, University of Freiburg, Germany.
Spillmann
L
L
D000222:Adaptation, Physiological; D006801:Humans; D008027:Light; D013997:Time Factors; D015348:Vision, Binocular; D015349:Vision, Monocular; D014785:Vision, Ocular / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*