researchers dropped the image exposure time from 80 milliseconds to 53 milliseconds, then 40 milliseconds, then 27, and finally 13 — the fastest possible rate with the computer monitor being used.
They were using a regular 75hz monitor, they didn't test anything faster than that because they couldn't. (Side note: the article rounded 13.3ms to 13, which you took as gospel and converted to 77fps - see how misinformation develops into a total ass-pull?). So the experiment would give us a
minimum of 75fps for the eyes/brain - if the experiment was about fps at all - which it isn't. It's about recognizing single images, not motion perception.
The reason I'm being an ass is because the claim of "77hz eyeballs" is patently false and similar claims have been stinking up my internet longer than you have been alive. I am sitting in front of a 120hz monitor right now. I can see it. I can drag windows around on it. I can tell the difference. You might as well be telling me that the brain can only control 6 fingers.