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The influence of stimulus luminance and contrast on hyperacuity thresholds for oscillatory movement *
Author(s) -
Watkins Russell,
Buckingham Terry
Publication year - 1992
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1992.tb00251.x
Subject(s) - luminance , hyperacuity , contrast (vision) , stimulus (psychology) , vernier acuity , parvocellular cell , optics , psychophysics , mathematics , audiology , physics , psychology , visual acuity , neuroscience , medicine , cognitive psychology , perception , central nervous system
Hyperacuity thresholds for oscillatory movement were determined under conditions of decreased contrast and decreased luminance. Responses were found to be resistant to contrast reduction down to 15%; below this level thresholds increased, The contrast response function is thus similar to that of the magnocellular channel of the visual system. Systematic reduction in luminance caused a corresponding rise in thresholds. It is suggested that this effect is due to undersampling of the retinal image as a result of a towered quantal absorption and an increase in critical duration of temporal integration al lower levels of luminance.