Opponent process theory explains which phenomenon that trichromatic theory doesn’t explain.

Alright, so opponent process theory explains which phenomenon that trichromatic theory doesn't explain. When we're thinking about opponent process theory, one thing that it can explain are after images, which are visual illusions where you'll basically if you're looking at one color for too long and then you look away, you'll see the opposite color. So if you were looking at red, you would see green. If you were looking at blue for a long time, you would see a yellow after image and that cannot be explained by trichromatic theory. What's basically happening here is that you have special opponent process cells in your nervous system and if you're looking at one color, the cells for the opposite color get suppressed that whole time. And so when you look away they kind of do a burst of firing which makes it seem like you're looking at a color that is not actually physically there in your environment. Now looking quickly at these other answer choices, a is color blindness, but trichromatic theory can explain color blindness. That can be caused by, basically some kind of malfunction of 1 or more types of cones in our retina. C is hallucinations, and hallucinations are a distinct phenomenon from visual illusions. So afterimages are visual illusions and these basically originate with some type of actual external stimuli. Right? So that afterimage, you know, the actual color that you're seeing is not present, but you're seeing it because of a color that is present. You're just seeing the opposite color. Right? Whereas with a hallucination, there is no external stimulus triggering it. It's happening entirely in the nervous system. So that is not explained by either of these theories. And then finally d reads night vision, and night vision is also not explained by either of these theories, that's just explained by the presence of rods existing in our retina, which of course respond to dim light and they give us night vision. So our answer here is b, opponent process theory can explain after images while trichromatic theory cannot. And there you go.