Motion Blur caused by Shutter Speed 50?!

Hi All,
I'm a GH2 user. Shoot in 50i-50ss-5.6f. I realized that is an effect such like "Motion Blur" which caused by the low shutter speed as I mentioned (50ss). Search around some forum, it is quite common. In fact, it looks not really comfortable to me! How do you solve this issue or perhaps reducing/smoothen the motion blur issue?
Picture like focus clear & sharp while talent do not move to left or right. Once his/her head move to left or right, there is motion blur after it. In fact, facused while talent did not move his/her head then.
Thanks!

David,
Thanks for the prompt reply and confirmation.
Perhaps, 1/50 producing slow shutter speed result--motion blur? It just like a man walk from left to right in front of my cam, and the man will be blur in motion during the recording. It'll only stay focused while the man stop and stand still. Double up the shutter speed will helps this? like 1/100? Might need your opinion.
Some friends ask me "are you shooting a speedy subject?". Not really that speed or fast. Just like what i've mention above, perhaps just walking...turn around...hand up...those might blur in 1/50 shutter speed with fully Continuos Focus Function.
I'm just curious, how could those GH2 friends shooting a Dance Genre Music of MV? They are dancing, moving fast enough...but, surprise, MV is just sharp and stay focused on every person! What do you say?
Is those below's MV consider pretty smooth? Can you tell what's the shutter speed on those? Continuos Focus + Manual Focus in use?
Thanks for now and hear from you soon! Apprciate to your precious time to answer
http://www.youtube.com/watch?v=i9KJEbCRPI0&feature=related
http://www.youtube.com/watch?v=5VNlsRk5FoM
http://www.youtube.com/watch?v=vZ9YW4RfdiU
http://www.youtube.com/watch?v=3FmSHWnlgSw&feature=related

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