SPIRAL MOTION AFTEREFFECT

(spiral MAE)

   Also known as spiral aftereffect. Both terms are used to denote a * motion aftereffect that can be induced with the aid of an * Archimedes's spiral or * Plateau's spiral. After viewing such a rotating spiral for several minutes and then shifting one's gaze to a stationary object, the object in question will appear to expand or contract, depending on the direction of the spiral's previous rotational movement. The spiral MAE has been classified by some as a special variant of the * waterfall illusion. However, it is usually classified as a * physiological illusion.

   References

   Mather, G., Verstraten, F., Anstis, S. (1998). The motion aftereffect: A modern perspective. Cambridge, MA: MIT Press.