 Thus, a vertically elongated aperture makes vertical motion dominant whereas a horizontally elongated aperture makes horizontal motion dominant. In the case of a circular or square aperture (Example Two), the perceived direction of movement is usually perpendicular to the orientation of the stripes (diagonal, in this case).
The perceived direction of movement relates to the termination of the line's end points within the inside border of the occluder. The vertical aperture, for instance, has longer edges at the vertical orientation, creating a larger number of terminators that move vertically. This stronger motion signal forces us to perceive vertical motion. Functionally, we perceive a moving pattern as a rigid surface moving in one direction.
Because we have only limited information, the actual motion of the line has many possibilities. Donald Hoffman has explained this "aperture problem" as the choice of our visual system to construct the smallest motion. This choice is motion orthogonal to the line that moves.
The barberpole illusion is found most often outside barber shops, although its use is declining.
- ↑ Gilford, J.P. "Illusory Movement from a Rotating Barber Pole." American Journal of Psychology 41, 686-687.
- ↑ Hoffman. Donald D. 2000. Visual Intelligence: How We Create What We See.
- Gilford, J. P. "Illusory Movement from a Rotating Barber Pole." In American Journal of Psychology. 41, 686-687.
- Hoffman, Donald D. 2000. Visual Intelligence: How We Create What We See. W. W. Norton. ISBN 0393319679
- Lalanne, Christophe and Jean Lorenceau. 2006. Directional shifts in the barber pole illusion: Effects of spatial frequency, spatial adaptation and lateral masking Visual Neuroscience. 23, 1–11. Retrieved October 31, 2007.
- Noe, Alva. 2002. "Is the Visual World a Grand Illusion? (Journal of Consciousness Studies Controversies in Science & the Humanities)." In Imprint Academic. ISBN 0907845231
- Wallach, H. and D. N. O'Connell. 1953. The kinetic depth effect. Journal of Experimental Psychology. 45, 205-217.
All links retrieved December 17, 2012.
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