http://www.youtube.com/watch?v=zAG-kX_IlUw
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I am certain that those are picked while muted with the fretting hand. Think of the early guitar work in SRV's little wing. The 12 second mark of this video.
http://www.youtube.com/watch?v=zAG-kX_IlUw
http://www.youtube.com/watch?v=zAG-kX_IlUw