I just learned that in video cameras, every frame of the video has its own shutter speed.
And I know how frame-rate in human eye works out, well, not completely, hence the question.
http://en.wikipedia.org/wiki/Frame_rate
The human eye and its brain interface, the human visual system, can process 10 to 12 separate images per second, perceiving them individually.
How much (or what is the equivalent of) shutter-speed in those individual images?