Doesn't work for me. The breaks break my focus entirely.
What did work was "if I can study for 20min, I will have studied enough for today." Which sometimes followed with hyperfocus resulting in studying for a time. 20min or 2hours were both victories in my book.
It does decrease sensitivity to consequences and decrease empathy. It also results in dominance seeking behaviour. It's why what happened to the victim, is done more often by men than women.
That's evil...