Preview Delay in capturing video -- How to eliminate it?

Hi, I am trying to do the following:
-- record video from an external camera (we are in an infant psychology lab, so our videos are all of cute little babies watching toys, playing with them, or listening to sounds)
-- but at the same time, check on line what the infant is doing, so that the experimenter can respond appropriately and in real time to the infants' actions. In order to do this, I want to use the Preview window as a monitor window
Here is my problem. The preview alwyas presents the video with a 1 second delay with respect to the real action. That is, I don't seem to be able to use the preview on screen as a faithful presentation of the live action, just as you do with a normal monitor attached to a videocamera.
Does anybody know how to reduce this delay? It occurs both in FC pro, in Imovie, and in WhackedTv. It did not occur, or at least, it was much reduced, when I was using Imovie 4.
Best to you all.
l.

Patrick, Dave:
thanks for your answers. In fact, I measured the delay in Imovie 4 and Imovie 6. It was 160 milliseconds in imove 4 and it is well above 1 sec in Imovie 6, as well as FC Pro, QT pro and WhackedTv. Something must have changed in the programming, but I find it peculiar that in a Pro application the user does not have control over this delay -- I can imagine several cases in which a "real" video representation may turn out to be crucial.
This is a terrible drawback as (Dave), yes, the experimenter is in a separate space far from the infant, and we cannot tolerate such delays. I am afraid I will have to go back to the old tape recorders...
Cheers,
l.

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