Which side is which?: How the brain perceives borders

LA JOLLA—In the classic “Rubin’s vase” optical illusion, you can see either an elaborate, curvy vase or two faces, noses nearly touching. At any given moment, which scene you perceive depends on whether your brain is viewing the central vase shape to be the foreground or background of the picture.

Now, Professor John Reynolds and Senior Postdoctoral Fellow Tom Franken have made headway into understanding how the brain decides which side of a visual border is a foreground object and which is background. The research, published on November 30, 2021 in the journal eLife, sheds light on how areas of the brain communicate to interpret sensory information and build a picture of the world around us.

“The way that the brain organizes and generates a representation of the outside world is still one of the biggest unknowns in neuroscience today,” says Reynolds, holder of the Fiona…
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