There are players who perform best under pressure - maybe adrenaline fuels their focus (or something).
pj
chgo
Performing well under pressure could very well be because the person does not have a normal adrenaline response. This is something one can figure out on their own. Ever been driving, looked away for a split second, and when you looked up, you noticed the car was drifting towards the other lane, with a car coming? Plenty of time to respond, and smoothly move the steering when back a touch.
When that happens to me, I can feel the adrenaline immediately surge. And this is the same thing that happens to me when I hit a shot on the table, and perhaps from the angle I am bent over the table, or a slight mishit, if the shot "looks bad" on the way to the pocket, I get that immediate surge of adrenaline, completely involuntary.
So people like me have to practice a lot more to tone down theadrenaline response, through sheer repetition under the heat, so the brain learns that pool shoots going bad are nothing to dump adrenaline over.
THEN, you got people that never seemed to succumb to the pressure, from the time they picked up a cue. Adrenaline is about FEAR. If you have no fear... There is no adrenaline dump.
Now.. Go and look at some of the pure talents in your area. Ever notice any reckles behavior? Like they are the type to just bulldoze forward in life, with lessened concern for consequences? That fear of consequences serves a very important purpose in the human brain. Without it, we might play good pool, and make one bad decision after another in our lives.
Back to the original comment: Adrenaline primes the muscles to move, and move FAST. Which is horrible for a pool stroke. Adrenaline itself, I don't think it helps anyone's pool game. Responding well to pressure is almost 100% about lack of "fear", whether that might be a natural part of one's psyche, or practiced. I think beta blockers work against the fear itself, which stops the adrenaline response from kicking off in the first place.
Edited to add that ShootingArts stated that beta blockers (or maybe the other medication?) act to physically lower the heart rate at rest, so I interpreted that to mean that the adrenaline response is still there, but the meds stop the heart rate from going too high. From what I heard, however, people who've played on them, say they felt like superman.
I do want to make a point, however... ShootingArts seems like he was already born with "it", so yeah, messing with that natural mix with a drug is gonna be counter-productive. But, we should consider the idea that there are some who have all the other tools, except the heart rate/adrenaline thing. And that may pretty much ensure they never get above a certain level. Interesting topic.