Question

observe the given figure ,why do the dots ,grey painted are appearing as white at the intersections of the grid? when you focus on an intersection the spot vanishes .why ?​

Answer 1

Answer:

An illusion of black dots at the intersections of the grid.

• The illusion is named after Ludimar Hermann, who wrote about it in 1870. It is also sometimes called the Hermann-Hering illusion as Edwald Hering (1872) also famously wrote about it. However, Sir David Brewster, Scottish scientist and inventor of the kaleidoscope, was actually the first to write about the phenomenon in 1844, and in his paper he claimed that the Reverend W. Selwyn had first observed it.

INSTRUCTIONS

• Allow your gaze to roam around the figure. Focus at one of the intersection points from time to time.

EFFECT

• Illusory grey dots or 'smudges' will appear at the intersection points of the white gridlines. The grey dots will disappear if you try to focus on them

Answer 2

Explanation:

At the peripheral intersections (purple circle), most of the receptive field is flooded with white light, causing strong lateral inhibition which results in reduced gain and an area that appears gray. More brain teaser games: Top 25 Brain Teasers, Games and Illusions. Brain Teasers for each Cognitive Ability.