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Decoupling focus from convergence tricks the brain into seeing 3D images in a 2D autostereogram. The eyes normally focus and converge at the same distance in a process known as accommodative convergence. That is, when looking at a faraway object, the brain automatically flattens the lenses and rotates the two eyeballs for wall-eyed viewing.
RapidEye/Getty Images. Everyone wants to keep their memory sharp and their brain functioning well as they age. But some of the tips on how to support cognition can be overwhelming, like the ...
Ambiguous illusions are pictures or objects that elicit a perceptual "switch" between the alternative interpretations. The Necker cube is a well-known example; other instances are the Rubin vase and the "squircle", based on Kokichi Sugihara 's ambiguous cylinder illusion.
Phosphenes have been created by electrical stimulation of the brain, reported by neurologist Otfrid Foerster as early as 1929. Brindley and Lewin (1968) inserted a matrix of stimulating electrodes directly into the visual cortex of a 52-year-old blind female, using small pulses of electricity to create phosphenes.
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Ambiguous images or reversible figures are visual forms that create ambiguity by exploiting graphical similarities and other properties of visual system interpretation between two or more distinct image forms.
The first image is bright and photographic, levels 2 through 4 show increasingly simpler and more faded images, and the last—representing complete aphantasia—shows no image at all. Aphantasia ( / ˌ eɪ f æ n ˈ t eɪ ʒ ə / AY -fan- TAY -zhə , / ˌ æ f æ n ˈ t eɪ ʒ ə / AF -an- TAY -zhə ) is the inability to visualize.
Similar theories have been expounded by the University of Liverpool's Paul Knox, who stated that what the brain interprets as colour may be affected by the device the photograph is viewed on, or the viewer's own expectations. [34] Anya Hurlbert and collaborators also considered the problem from the perspective of colour perception.