1,721,014 research outputs found
Perception, Special Issue: Contextual Effects on Colour Appearance, II. Neon Colour Spreading, Surface Properties, and Motion
No full texta cura d
Line induced color spreading: A new principle of grouping and figure-ground organization
No full textPerception, Special Issue: Contextual Effects on Colour Appearance, I. Lightness and Colour Induction, Transparency, and Illumination
No full texta cura d
Reply to Barris
No full textWe are grateful to Dr. Michael C. Barris for pointing out a resemblance between the subtle color gradients visible in Wassily Kandinsky’s 1916 painting (Fig. 1, below) and the assimilative watercolor spreading described by Pinna, B. (1987). Un effetto di colorazione. In V. Majer, M. Maeran, M. Santinello (Eds.), Il laboratorio e la cit
New illusions of sliding motion in depth
No full textApparent sliding motion in the so-called Ouchi illusion has been attributed to the global integration of local motion vectors arising from the aperture effect (Fermüller et al, 2000 Vision Research 40 77 – 96; Mather, 2000 Perception 29 721 – 727). In a number of variants of the Ouchi illusion, we here demonstrate that sliding motion will also arise without a directional motion bias from local elements. Specifically, we show that in a disk – annulus pattern made from wiggly lines, sliding motion occurs although the local orientations within the disk and annulus are the same. We then argue that in an array of square-shaped checks, sliding motion originates from the interaction between the explicit orientation of the checks and the implicit orientation of the invisible diagonals. Finally, we demonstrate that a central array of filled black circles surrounded by a grey edge appears to slide relative to a surround of empty circles. We tentatively account for sliding motion in this figure by differences in speed signals, figure – ground segregation and apparent depth due to contrast polarity, edge blur, demarcation by a frame, and difference in shape
Anomalous induction of brightness and surface qualities: A new illusion due to radial lines and chromatic rings
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