Answer:
opponent- process
Explanation:
Here is the complete question:.
Bradley is watching his twin daughters play on a playground seesaw, and is fascinated by the way only one side can be up or down at a time. He thinks about color vision, and recognizes that this is similar to how the __________ theory describes his ability to see just one color of a color-pair at a time.
a. signal detection
b. opponent-process
c. sensory adaptation
d. trichromatic
And the answer is
B. opponent- process