Several reports have cited this as the “expanded hole” illusion. This dynamic illusion consists of black dots, which are like small elliptical balls on a white background. In the very center of the image is a black patch with no defined outline. This hazy black spot looks like a hole, and it keeps spreading when you take your eyes off it.
Reports say that although it is clearly seen that the black hole in the middle of the image continues to expand until we look at it, 20% of people do not understand this expansion. This clear distinction between observers draws attention to a proper understanding of the mechanism of how this illusion works.
what people see in confusion
As mentioned earlier, most people see that black patch or black hole keeps spreading when we look at the image. The black hole creates the illusion of a hollow dark matter that continuously expands on a white background and contains black elliptical balls.
However, others who do not understand the above illusion see it as a black speck of ink. These illusions Resilient individuals do not understand detail.
What researchers say about the illusion
The researchers explain that the rate of change of pupil diameter is significantly related to illusory speed.
“At the root of these bright/dark illusions is the fact that, in general, the perception of light is not directly related to physical parameters; therefore, the visual system relies on ecological regularities or constraints to generate perceptual hypotheses, mostly In the examples, achieve the practical success of vision practically,” says a research report explaining this optical illusion. May 2022, the study is published in Frontiers in Human Neuroscience.
“Typically, when observing the pattern below, observers’ subjective reports are characterized by the perception of a gradually expanding central region, over a period of several seconds,” the researchers say and added. that about 20% of the participants who were involved in the study did not experience delusional elaboration.
This study was done on 50 people with normal vision. Participants were asked to rate the magnitude of the illusory motion or enlargement of the black hole, and these predicted the degree of pupil dilation, which was measured with an eye tracker.
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People who have a greater change in pupil diameter rated the intensity of the illusion as high. Those who did not see any change had no change in the diameter of the pupil.
The researchers concluded that pupil dilation or constriction is not only guided by our surroundings, it is also guided by our own imagination and perception.