In Hermann's grid, gray areas appear at the intersections because
A) the amount of inhibition right at the intersections is twice as great as the inhibition between each square.
B) the amount of inhibition right at the intersections is much less than the inhibition between each square.
C) the superior colliculus responds maximally as you move your eye from intersection to intersection.
D) moving the eye creates a blur at all the intersections.

Question

Quizplus · Accepted Answer

The gray areas at the intersections in Hermann's grid occur because the amount of inhibition right at the intersections is twice as great as the inhibition between each square. This causes the brain to perceive gray patches at these intersections, which are not actually present in the stimulus.

In Hermann's Grid, Gray Areas Appear at the Intersections Because