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Temporal brightness and darkness enhancement; further evidence for asymmetry
Author(s) -
SVEIN ALF GLAD,
ENGVIK MAGNUSSEN HARALD
Publication year - 1976
Publication title -
scandinavian journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 72
eISSN - 1467-9450
pISSN - 0036-5564
DOI - 10.1111/j.1467-9450.1976.tb00235.x
Subject(s) - luminance , brightness , darkness , flicker , psychology , asymmetry , stimulus (psychology) , perception , psychophysics , optics , physics , cognitive psychology , computer science , neuroscience , quantum mechanics , operating system
.— Previous studies by the authors on brightness and darkness enhancement during flicker indicate a sizeable and consistent difference in magnitude between the two effects, as defined in terms of log matching luminance. To explore whether this difference is an artifact of the logluminance representation of the perceptual effects, a psychophysical scaling experiment was performed and results from present and former flicker experiments were replotted in terms of subjective units. When the depth of luminance modulation of the flicker stimulus exceeded 50%, the difference in magnitude of temporal brightness and darkness enhancement was somewhat smaller expressed in subjective units compared to a log‐luminance representation. On the whole, however, the two plots gave essentially similar results. The results are discussed with reference to the neurophysiological theory of the B‐ and D‐systems.