Abstract:
:A narrow bar or line (width around 1 arcmin) between two fields of which the luminances are sinusoidally and in counterphase modulated in time appears to make an oscillatory movement. It is possible to annihilate this illusory movement with a real movement and thus to analyze this phenomenon quantitatively. Confirming previous studies, the amount of illusory movement (amplitude typically 10 arcsec) was proportional to the modulation depth of the fields and inversely proportional to the line width and the line contrast. The amount of illusory movement increased with defocus, a lower mean luminance, and eccentricity. The experimental results could be explained by a model that includes a linear low-pass spatial filter. For a Gaussian spatial filter, the standard deviation as derived from the experimental results was 1.1 arcmin (1.0-1.3 arcmin) (median with range of four observers) for well-focused, photopic, foveal viewing. We explored various criteria for line localization in the model (extremes and zero-crossings of Gaussian derivatives).
journal_name
Perceptionjournal_title
Perceptionauthors
Jansonius M,Stam L,de Jong T,Pijpker BAdoi
10.1068/p7716subject
Has Abstractpub_date
2014-01-01 00:00:00pages
1329-40issue
12eissn
0301-0066issn
1468-4233journal_volume
43pub_type
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