text: why does the computer screen bounce?? does anyone know why the computer screen or even tv screen appear to bounce when you are viewing them as you are chewing something? oooo, that's a good one, and thanks, because i was going to ask a similar question. did you ever look at a fan as you were walking towards it? if you take a heavy step, or stomp, the fan blades will appear to stutter, or freeze for just a second. sort of a strobe effect. i think that this is related to the "bounce" in the computer monitor, which is also presenting moving images (at 60 or 120 cycles). my theory = which has not been confirmed - is that we are seeing a mental/psychological response to momentary interruption of the visual "signal" transmitted to the brain. the brain sort of smooths over the gap in signal, which results in a freeze-frame, in the case of the fan, or a bounce, in the case of the monitor. i think the cause of this might be that vision is a chemical process in the rods and cones of the retina. a thump, produced by chewing or stepping, might cause a momentary change in the chemical reaction.  anyway, i like your question ... it shows genuine curiousity about why things are the way they are ... which is the basis of good science.