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Reality check A lively dive into the brain's knack for showing us the world as we expect to see it
The Guardian Weekly
|June 20, 2025
The process of perception feels quite passive.
The process of perception feels quite passive. We open our eyes and light floods in; the world is just there, waiting to be seen. But in reality there is an active element that we don't notice.
Our brains are always "filling in" our perceptual experience, supplementing incoming information with existing knowledge. For example, each of us has a spot at the back of our eye where there are no light receptors. We don't see the resulting hole in our field of vision because our brains ignore it.
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