Some Effects of Changes in Spiral Size and Viewing Distance on the Duration of the Spiral Aftereffect

Abstract
Duration of the spiral aftereffect (SAE) was investigated with spirals of 2, 4, 8, 12, 14, and 16 inches in diameter. The distance of the spirals from the observers was varied to produce visual angles between 1°12′ and 18°56′ of arc. Data indicate that peak SAE durations occur approximately between 2° and 4° of visual angle.