Standing up at the wicket, a keepers hands move more naturally sideways left/right than up/down.
After many years, they become attuned to expect the ball to move left or right. A ball that jumps up or stays low is a surprise one, which could catch them off-guard.
There are other factors involved - losing sight of ball, amount of turn, mystery turn etc
After many years, they become attuned to expect the ball to move left or right. A ball that jumps up or stays low is a surprise one, which could catch them off-guard.
There are other factors involved - losing sight of ball, amount of turn, mystery turn etc