1997
DOI: 10.1364/josaa.14.001213
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Brightness fading during Ganzfeld adaptation

Abstract: 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 perceiv… Show more

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Cited by 17 publications
(10 citation statements)
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“…One obvious possibility is that it encodes the changing background light intensity for higher visual processes, including perception. Psychophysical studies confirm that irradiance can be accurately perceived under a wide range of circumstances (42)(43)(44)(45)(46). Indeed, although humans perceive stimuli with very slowly changing irradiance (as presented here) as invariant, they do eventually report that the scene has gotten brighter.…”
Section: Discussionsupporting
confidence: 59%
“…One obvious possibility is that it encodes the changing background light intensity for higher visual processes, including perception. Psychophysical studies confirm that irradiance can be accurately perceived under a wide range of circumstances (42)(43)(44)(45)(46). Indeed, although humans perceive stimuli with very slowly changing irradiance (as presented here) as invariant, they do eventually report that the scene has gotten brighter.…”
Section: Discussionsupporting
confidence: 59%
“…Note that no thresholding operation is applied. The resting potential of equation 2.7 is zero and is identified with the perceptual Eigengrau value (Gerrits et al, 1966;Gerrits & Vendrik, 1970;Gerrits, 1979;Knau & Spillman, 1997). In a biophysically realistic scenario, equation 2.7 has to be replaced by two equations: one for describing perceived brightness and one for perceived darkness.…”
Section: Subsystem Ii: Gradient Generationmentioning
confidence: 99%
“…with parameters given in Table 3 The Eigengrau level (Gerrits & Vendrik, 1970;Knau & Spillman, 1997) is set to V rest Z0. The last equation applies to both BEATS filling-in and confidence-based filling-in.…”
Section: Perceptual Activity Of Surface Representationsmentioning
confidence: 99%
“…The mid-gray level is called Eigengrau (Gerrits & Vendrik, 1970;Knau & Spillman, 1997), and refers to the percept which is reported by subjects after the disappearance of a stabilized retinal image. Here, we will use the term perceived luminance or perceptual activity to describe the final appearance of a surface.…”
Section: Introductionmentioning
confidence: 99%
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