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Effect of stimulus duration in flicker perimetry
Author(s) -
Anderson Andrew J,
Vingrys Algis J
Publication year - 2000
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1046/j.1442-9071.2000.00299.x
Subject(s) - flicker , luminance , flicker fusion threshold , stimulus (psychology) , audiology , optics , pedestal , psychophysics , medicine , physics , psychology , neuroscience , computer science , perception , history , archaeology , psychotherapist , operating system
We investigated the relationship between stimulus duration and flicker thresholds when flickering stimuli were presented on luminance pedestals. Mean‐modulated flicker thresholds remained constant with changes in stimulus duration. However, flicker presented on a luminance pedestal gave masking at short durations, decaying exponentially to stable thresholds with time. These stable thresholds were elevated when compared with the mean‐modulated condition. The lowest threshold in a stimulus onset asynchrony function predicted the threshold obtained from a luminance‐pedestal flicker stimulus of the same duration. This suggests that luminance‐pedestal flicker thresholds are determined by the most detectable cycle in a multiple cycle stimulus. We find that the 800 ms stimulus duration used in the Medmont™ M600 perimeter (Medmont, Camberwell, Australia) is suitable to determine stable flicker thresholds.