If a viewer stares at this image for 5–60 seconds and then looks at a white object, a negative<unk>  will appear (in this case cyan on magenta). This can also be achieved by the viewer closing their eyes and tilting their head up. An<unk>  is an image that continues to appear in the eyes after a period of exposure to the original image. An<unk>  may be a normal phenomenon (physiological<unk>  or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological<unk> s.<unk> s occur because photochemical activity in the retina continues even when the eyes are no longer experiencing the original stimulus. The remainder of this article refers to physiological<unk> s. A common physiological<unk>  is the dim area that seems to float before one's eyes after briefly looking into a light source, such as a camera flash. Palinopsia is a common symptom of visual snow.
Afterimage
AfterImage
Talairach coordinates
UW Med Flight
Anatomical terms of motion
ReSPECT process
QWERTY Tummy
Khodadoust line