such a super smart and well written response, it's a delight to read. It's quite interesting to know that the same principle is behind the temporal antialiasing.WRT to temporal resolution (motion resolution), I find that it's easier to explain to someone by breaking it down to the amount of data that is being presented to the viewer's eyes and brain.
In motion 1x 4k frame at 60 FPS presents very roughly a similar amount of information to your visual system as 4x 1080p frames at 240 FPS.
However, with 4 frames of 1080p content per 1 frame of 4k content not only are you getting a similar amount of visual data, but it fills more temporal "space" leading to less judder/stutter/etc.
That said, when not in motion, 1080p versus 4k is going to look perceptibly worse even if you see 4 frames of 1080p for every frame of 4k. Also, while it may help to remove some aliasing artifacts, most will still remain even in motion.
That's where temporal reconstruction comes in. You get the benefits of temporal resolution (higher perceived resolution with lower resolution or lower data at same resolution per frame) while in motion while also retaining the benefits when not in motion. As well, depending on the reconstruction method, this will address many forms of aliasing artifacts as the developer can choose what data is presented in each frame (kind of like multi-sample AA but instead of it being in one frame, it's spread over multiple frames).
However, temporal reconstruction breaks down at 30 FPS where each frame is presented too slowly to mask differences between frames.
It's why I believe that at least MS if not Sony as well, want to move the baseline rendering speed from 30 Hz to 60Hz or even 120 Hz.
Regards,
SB
What you describe certainly work very well on many games. You can sacrifice AA for extra frames that way, specially when you set almost everything to low.
At least in some games, not all. Having most settings to low..., well, of course is not the same, but it has some advantage too, specially 'cos there are less things distracting you.
On another note, Halo Reach at 240 fps is a reality with a 1080, no problem at all. The only advantage I found playing it a 4k 60 is that 4k gives you extra AA, other than that there is no contest.