Input delay test, left to neutral. The screen is light when the stick is held to the left, dark when it's not. The two series are tests at turbo 0 on the Xbox 360 with a SE stick. Note the difference in the second-to-last image.

0			At the start, Ryu is moving to the left. About 1/3 through the frame (where the image gets dark) the stick goes to neutral. Note that the image on the right has the dark line just a bit lower, indicating the stick was shifted later. In theory, a lag-free system could show Ryu neutral here already, but HDR only samples input once per frame.
1			The stick is still neutral, and Ryu continues moving to the left. A lagless system that samples once per frame would show Ryu neutral here.
2			Two frames after going to neutral, the stick is once again held left and the screen goes bright to reset for another test sequence (not shown). Once again, the change is lower on the right image because it happens later in that sequence.
3			In both samples, Ryu is still heading to the left, since the game is still lagging.
4			In the left sample, Ryu is now at neutral, the right sample still has him moving left.
5			Both sides now have Ryu at neutral.