An area on our retina that lacks photoreceptors is called ______

The first person to study single optic nerve fibers was________

Fill in the blank(s) with the appropriate word(s).

When you stand to the side of a window frame, it casts a trapezoidal (nonrectangular) image on your retina. It still seems rectangular to you, though, because of ______

a. size constancy c. figure-ground constancy b. shape constancy d. the phi phenomenon