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Why isn’t it possible to simultaneously see all twelve dots in the image below?



Here is a clarification of why this occurs:


1. **Contrast Responsiveness and Sidelong Inhibition**: The human visual framework improves contrast at edges through a system called horizontal restraint. This includes neurons in the retina hindering the movement of adjoining neurons. In the matrix, the high-contrast convergence points (where the white lines meet) cause areas of strength for an impact on the neurons addressing those focuses.

2. **Perception of Dim Dots**: When you attempt to zero in on a particular crossing point, the encompassing convergences fall into your fringe vision, where the horizontal restraint impact is more articulated. This causes the presence of dim specks at the crossing points you're not straightforwardly checking out. The inhibitory impact is less at the fovea (the focal point of your vision), which is the reason the spots vanish when you gaze straight toward a convergence.


3. **Limited Consideration and Visual Acuity**: The visual framework can't handle every one of the subtleties of the matrix at the same time because of impediments in consideration and the keenness of fringe vision. At the point when your look movements to an alternate convergence, the recently engaged convergence could foster a dark dab because of similar inhibitory cycles influencing your fringe vision.

Hence, the deception fools your mind into seeing dim specks at the crossing points you are not straightforwardly zeroing in on, making it difficult to see each of the twelve spots immediately. The transaction among focal and fringe vision and the mind's handling of high-contrast edges is at the center of this visual deception.

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