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@mdc In the linked article, I thought the following was interesting:

For the research, Pearson and colleagues recruited 14 people with aphantasia and 18 people without aphantasia. The team used a trick called "binocular rivalry," which involved flashing two striped patterns of different colors in front of the participants' eyes.

The brain constantly merges visual information from the left and right eyes to construct one cohesive image, and thus it cannot fully process this binocular rivalry. Its attempt to process the flashing stripes typically results in a visual illusion in which the two patterns fluctuate, with one image dominating for a few seconds. (1/2)