How can I keep patterns from flashing when scrolling?

I am sensitive to flashing and strobing lights. They hurt. I have a lot of trouble with disorienting 'safety' lights, certain fluorescent lights, certain websites, et cetera. I also have trouble with disorienting noises. Elsewhere on this site, I had trouble with my screen flashing as I was scrolling. Apple had used a pattern of dots to create a medium grey, instead of using an even grey. It works fine on paper, but it flashes on the screen. Many patterns flash on the screen if I am scrolling.
Is there anything I can do about this?

When you first insert a CD your Mac comes up with a box saying
"You have inserted a CD" (duuh, Apple...)
Then you choose from a pop-up menu that offers "Open in Finder", "Open in iTunes", etc
At some point you (or someone) has chosen "Open in iTunes" then checked the little box that says "Make this the default from now on".
If you go into System Prefs (as already mentioned) you have a choice to reset what you want to do with a blank CD.

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