Regarding random-dot stereograms,

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Quizplus · Accepted Answer

Stereopsis, or the perception of depth, relies on the brain's ability to integrate visual information from both eyes. When low spatial frequencies are removed from one half of a stereogram and high spatial frequencies from the other, the brain struggles to match the corresponding elements between the two images, leading to a disruption in depth perception. This does not necessarily apply when the same spatial frequencies are removed from both halves, as the brain can still process the matching elements between the two images to perceive depth. Additionally, it is not possible to predict the depth relationships in a random-dot stereogram by looking at only one half, as the depth information emerges from the correlation between the two halves.

Regarding Random-Dot Stereograms