Journal article

Frequency-doubling illusion under scotopic illumination and in peripheral vision

Kunjam Vallam, Ioannis Pataridis, Andrew B Metha

INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE | ASSOC RESEARCH VISION OPHTHALMOLOGY INC | Published : 2007

Abstract

PURPOSE: The authors sought to determine whether frequency-doubling illusion (FDI) could be perceived under scotopic illumination at central and peripheral retinal locations. For comparison, perception of the FDI at the central and peripheral retina under photopic illumination was also evaluated. METHODS: Five subjects matched the apparent spatial frequency of counterphase flickering sinusoidal gratings with stationary sinusoidal gratings presented foveally and out to 20 degrees eccentricity under photopic and scotopic illumination conditions. Two spatial frequencies (0.25 and 0.50 cpd) were used at four temporal frequencies (2, 8, 15, and 25 Hz). Subsequent experiments explored the range of..

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University of Melbourne Researchers