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| Description: Sensation depends on change and contrast in the environment. Hold your hand over one eye and stare at the dot in the middle of the circle on the right. You should have no trouble maintaining an image of the circle. However, if you do the same with the circle on the left, the image will fade. The gradual change from light to dark does not provide enough contrast to keep your visual receptors firing at a steady rate. The circle reappears only if you close and reopen your eye or shift your gaze to the X. Picture Stats: Views: 232 Filesize: 138.02kB Height: 384 Width: 398 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39056 |