Now You see it Now You don't
November 15, 2006 4:51pm CST
With this experiment you will understand how quickly your visual system adapts to a constant stimulus.our nervous system "pays more attention" to changing stimuli than to constant stimuli. For example, your feet feel your socks as you're putting them on, but for most of the day, you're not even aware of them.when a stimulus is repeated, the response to the stimulus decreases. This is sensory adaptation. Sensory adaptation is a way of "filtering out" stimuli that are constant. Look first at the image of the airplane, and fix your gaze right on the dot. You'll notice immediately that the lighter portions on the left half of the plane have a definite bluish cast, while those on the right half of the plane have a definite yellowish cast. So far, so good. Now you are going to use the top half of the figure to adapt your visual system. Fix your gaze on the dot between the blue and yellow rectangles for 20 seconds. It's OK to blink normally, but keep your gaze fixed on the dot while your eyes are open. After 20 seconds, shift your gaze to the dot in the airplane image. If you keep your eyes trained on the dot while examining the picture, you will notice that now the lighter portions of the plane now look the same in both halves of the picture. As you continue to look at the plane, you may notice the color differences reappearing. Did you see it or didn't see it tell me your experience.
• United States
16 Nov 06
I saw it. But right after I shift from the rectangles to the dot on the plane picture I notice a green line right down the center. As for the color difference disappearing- that worked. And if I stared at it for more than 5 seconds it started to go back to one side being more blue and the other being more yellow. Pretty neat how our brains react to things!