[quote name='Chuplayer']Then why do games like Guitar Hero have built-in response time adjusters?
The changing colors thing is correct. The end result, though, is a lagged picture that hampers your ability to respond in a manner similar to how you would on an NTSC CRT tube because the slowness of changing colors is what defines the lag.[/QUOTE]
Guitar Hero and Rock Band don't have response time adjusters, they have input lag adjusters.
Response rate is different from input lag, let me go over it again.
Input Lag: When you press a button and it takes longer on screen.
What causes this is because the TV has to do some processing on the image. Each TV has a natural resolution such as 720p/1080i or whatever, and monitors have several. When the TV has to take an image at 480i and upscale it to 720p, that causes lag. For a CRT SDTV there is no lag; the game runs at 480i and processes at 480i. For a CRT HDTV, there could be lag if the natural resolution is 720p and the game processes at 480p.
Additionally, TVs also like to process the image to make it look better, or there may be other processes such as HDCP that contribute to the lag. Some TVs include a game mode which tries to disable as much of these processes to eliminate lag. This is the lag that you, as a gamer, should care about. This is the lag where you press a button and it doesn't come out for 3 ms.
Note that no manufacturers test for input lag. The only reliable way of testing is to look for timecode tests of the TV on the internet or to perform your own.
Response time: How fast an LCD TV changes colors. This leads to blurring when there is high action on the screen. The easiest way to see this is to play an FPS on a high response time monitor; when you move in different directions it blurs.
This does not necessarily cause lag.
At the leading edge of the motion, there is no blur, as it only has to change pixel colors once. Blur happens at the trailing edge of the motion because the pixel is frantically changing from multiple colors, but technically the motion is not laggy because the front end of the motion processes quickly.
Response time does not contribute to input lag but can still affect your gameplay if you play something like an FPS or a very high speed song on a rhythm game. Notes may appear blurry or cloned on a high response time TV.