A fortification illusion often begins with
A) a headache.
B) a seizure.
C) a gray area of blindness near the center of the visual field.
D) a zigzag pattern of flickering lines.
E) thick lines in the periphery that then constrict.

Question

Quizplus · Accepted Answer

A fortification illusion often begins with a gray area of blindness near the center of the visual field, known as a scotoma, which then spreads outward in a jagged, "fortification wall" pattern.

A Fortification Illusion Often Begins with