After concentrating on object and then looking at another object, sense qualities opposite to, or shifted away from, original appear {aftereffect}| (CAE) [Blake, 1998] [Blake and Fox, 1974] [Dragoi et al., 2000] [He et al., 1996] [He et al., 1998] [He and MacLeod, 2001] [Koch and Tootell, 1996] [Montaser-Kouhsari et al., 2004].
afterimage
After observing bright light or image with steady gaze, image can persist {afterimage} [Hofstötter et al., 2003]. For one second, afterimage is the same as positive image. Then afterimage has opposite color or brightness {negative afterimage}. Against white ceiling, afterimage appears black. Colored images have complementary-color afterimages. Intensity is the same as image {positive afterimage} if eyes close or if gaze shifts to black background. Afterimage size, shape, brightness, and location can change {figural aftereffect}.
brain
Perhaps, CAEs reflect brain self-calibration. Orientation-specific adaptation is in area V1 or V2.
curves
Aftereffects also appear after prolonged stimulation by curved lines. Distortions associated with converging lines do not change with different brightness or line thickness.
gratings
Horizontal and vertical gratings cause opposite aftereffect {orientation-dependent aftereffect}, even if not perceived.
movement
Background can seem to move after observer stops moving {motion aftereffect, vision}.
stripes
Alternating patterns and prolonged sense stimulation can cause distortions that depend on adapting-field and test-field stripe orientations {contingent perceptual aftereffect}.
theory
Aftereffects appear because sense channels for processing color and orientation overlap {built-in theory} or because separate mechanisms for processing color and orientation overlap during adaptation period {built-up theory}.
tilt
After observing a pattern at an orientation, mind sees vertical lines tilt in opposite direction {tilt aftereffect}.
time
CAEs do not necessarily decay during sleep and can last for days.
Consciousness>Consciousness>Sense>Vision>Illusions
1-Consciousness-Sense-Vision-Illusions
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Date Modified: 2022.0224