120 hertz is not the signal recieved by the tv, it is the signal made by the tv. All inputs will most likely be 24p (bluray) and 60 hertz (tv/dvd). The signal is passed to the tv, and the tv shows it at 120 hertz. It is always on. Automotion plus/motionflow is NOT 120 hertz, it is just a feature included in 120 hertz tvs (and the odd 60 hertz tv, like the sony v4100).
This is why all hdmi cables that are advertised as 120hz cables are BS, there is no tv able to accept a 120hz signal yet.
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