From the HDTVtest.co.uk review of the W829B:
This is one area where the Sony Bravia W82 trumps over the step-down W7 model, offering motion-compensated frame interpolation (MCFI) and black frame insertion (BFI) in various permutation and intensity through the supplied [Motionflow] control. Let’s go through the options one by one:
“Off”: Doesn’t apply any motion-boosting technology. Motion resolution 300 as determined via the horizontally scrolling lines pattern in Chapter 31 of the FPD Benchmark Software disc.
“True Cinema”: Ensures native 24p playback for 1080p/24 material such as Blu-ray movies. Motion resolution stays the same at 300, since there’s no MCFI/ BFI involved.
“Standard”: Pure MCFI. Doubles motion resolution to 600. Not advised.
“Smooth”: Pure MCFI with stronger intensity, which introduces more interpolation artefacts even though motion resolution did not increase beyond 600. Avoid.
“Clear”: MCFI with a small component of BFI. Few interpolation artefacts with a mild decrease in on-screen luminance. Motion resolution 1080. Good for daytime general use.
“Clear Plus”: MCFI with a higher proportion of BFI. Even less interpolation artefacts, but picture is darker than “Clear“. Motion resolution 1080. Suitable for night-time general viewing.
“Impulse”: Pure BFI. Motion resolution 1080. May be too dim for most usage.