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Ryo Shohara, Makoto Katsumura, Seiichiro Naito; Continuous Transilience Induced Blindness ― H-V Anisotropy and Luminance Asymmetry of disappearance ―. Journal of Vision 2012;12(9):890. doi: 10.1167/12.9.890.
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© ARVO (1962-2015); The Authors (2016-present)
Introduction: The transilient inducer changes lead to the transient disappearance of large figures (VSS2011-26:413). We devised the improved inducer which repeated the continuous transilience (CTIB) so that the disappearance was perfectly synchronous to the inducer and could last 1 second. We investigated the horizontal-vertical anisotropy and the luminance asymmetry.
Methods: On the black (0.341cd) background, two white (110cd) filled circle with 10 degree diameter stationary targets were presented at lateral 10 degree eccentricity. The inducer was the six concentric circles which appeared one by one at the edge of the target and expanded over 5.25 degree. They were separated at 0.525 degree each other. The first circle was gray (5.15cd), and the consecutive circle colors were changed to black in linear manner. All of them expanded over the annulus then disappeared. The inducing sequence completed in 1800ms. After the inducer was OFF the target remained ON up to 4500ms. The whole sequence repeated indefinitely. The orientation of the targets was set either at horizontal, +45 degree, vertical, and -45 degree angle. For luminance asymmetry condition, on the white background the black targets were presented. The inducer was light grey (42.4cd). The vertical orientation arrangement was examined.
Results: We found the marked anisotropy that the horizontal condition was difficult to disappear which yielded less than 5% of time cumulative disappearance. The vertical condition gave more than 50% time cumulative disappearance. We had the graded disappearance ratio for oblique orientations. The clear luminance asymmetry was also discovered. The black on white condition yielded 10% of cumulative disappearance ratio contrasting to the 50% of white on black condition.
Conclusions: The results gave more confident evidence for H-V anisotropy, though it would be controversial to the conventional MIB results. The On-Off cell asymmetry would not likely be the origin of the luminance asymmetry.
Meeting abstract presented at VSS 2012
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