To evaluate the stutter of TVs with 24fps and 60fps content, we use the response time to determine how long a static image is shown between frame transitions.

Motion interpolation is a feature that increases a video’s frame rate, usually up to the maximum frame rate of the TV. We test all our TVs to see whether they are able to interpolate 30 fps and 60 fps video.

Soap Opera Effect comparison on a 120Hz TV. It creates interpolated frames to make the scene more fluid.
Full article at: http://www.rtings.com/info/what-is-the-soap-opera-effect-on-tvs

Note: It is normal that you cannot see the difference in the real time footage besides artifacts. Youtube frame rate is 30fps so it cannot represent accurately 120fps footage, which is why we provided slow motion videos.

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Settings on the Sony EX500 (KDL-46EX500)

OFF:
MotionFlow: Off
CineMotion: Off

On:
MotionFlow: High
CineMotion: Auto1
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Shot on a Lumix LZ200. Real time @ 30fps, Slow Motion @ 240fps.