This short video shows how momentum works in FIFA 20. This is from 2 player kick off where I controlled both teams. However this same AI behaviour is in all form of the game.
I scored an own goal so the scores are uneven and then just watched what happens when I did nothing… In the course of a game this would not happen however to undertand how the AI works this is useful.
The team behinds defensive AI after a few minutes will change behaviour and you will see the mid field push up to mark tightly all the players. Also the defensive line will be slightly higher. For the team leading this behaviour is not present.
This means the AI is programmed to respond differently depending on the score. Or in other words you can observe momentum at work.