Question

The Hermann Grid creates the illusion of grey areas at each ofthe intersections of the white bars. If you stare at any oneintersection, the illusion is not as strong (and may disappearaltogether). However, the illusion persists at the intersectionsthat you are not directly looking at. This illusion has beenexplained as being due at least in part to the receptive fieldproperties of your retinal ganglion cells (which are similar inmost vertebrates, including toads). Explain how such properties maygive rise to this illusion most strongly in our peripheral vision,and why the illusion is not as strong for the intersection that youstare at directly. You may draw a picture or pictures toillustrate, but you must also explain in words.

I can't paste the grid for some reason, but if you're familiarwith it, please help !