As I was researching this topic I found some surprising things. First of the average reaction time for an athlete is 0.2 seconds, a normal person is 0.3. That difference is pretty big when it comes to reaction time. This surprised me a lot just because I never thought how fast we reacted to different things.
Also sound and thought process can effect reaction time, so if you play a constant sound while trying to play a reaction time game, it would be a little bit slower. Also second guessing a choice can slow you're reaction time. This also surprised me a lot because when I do keeper practice I listen to music, so it is actually hurting my progress.
If you train enough, you can increase your reaction time by about 20%, but that is the max, sadly you cannot improve reaction time by that much. I was not even surprised by this, it seems so basic and well known how fast we react to things, and we can get a 0.0 reaction time.
Overall I found out that noises and overthinking can make reaction time slower. This would affect a goalkeeper so much in the sense that if you over think a PK then most likely you will be too slow to get to the ball. You have to keep a clear mind when playing that position.
Cooper wants to be a better goal keeper. He has a reaction time of 0.3 he trains by using noise and different thoughts while playing a reaction time game. It improves to 0.2 seconds , now he is a champion.