【单选题】You stare at waterfall for a minute or two, and then shift your gaze to its surroundings. What you now see appears to drift upward. These optical illusions occur because the brain is constantly matchi...
A.
matched to six to seven million structures called cones.
B.
confused in the body’s sensors of both rods and cones.
C.
interpreted in the brain as what must be the case.