Does lower display screen resolution reduce Anti aliasing

ok.now when i play a game at 1680*1050 resolution instead of 1920*1080 the aa is extremely reduced and the game looks much better with all the characters appearing bigger.why is this so?
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More about does lower display screen resolution reduce anti aliasing
  1. When reducing the resolution the game will sometimes increase the setting to be higher quality. This can leade to aa being turned on and other settings resulting in a better picture quality. Characters will appear bigger as the resolution is smaller, what use to be 1 in high is now about 1.15 in high. Thus if you lowered your resolution more you will get bigger characters. However, this limits the field of view as you are now more focused on the characters and not the surroundings.
  2. is this quality improvement in all games or in some only?for example i can play crysis max with gtx 260 superclocked so will lowering the resolution to 1680 improve crysis quality with performance?
  3. The quality improvement only occurs if you are maxing out your card at the higher resolution. If you have max setting on at the high resolution and getting 60 fps, you will likely notice a lower quality when decreasing the resolution due to less pixels per inch. If you did not have max settings on at high resolution and you decrease your resolution, you could see an increased quality at the same fps.
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