In order to determine which aspect of the post-impact motions are most important, we generated three pairs of animations systematically varying the distance traveled, velocity, and movement time. For the first pair, distance traveled was held constant while velocity and time differed. For the second pair, velocity was held constant while distance and time differed. For the third pair, time of motion was held constant while distance and velocity varied. Below, you can see an example of this last pairing. The animations differ with respect to distance covered and velocity of the movement, but are equated with respect to the time of their post-impact duration.
By
comparing the effects in each of these pairs, we were then able to
determine which aspect of the post-impact motion (velocity, distance,
duration) was most significant. From this data, it is clear that time of motion (rather than velocity or distance covered) is the factor driving this illusion.
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Demos > Deconstructing gestures >
3 - Distance vs. Time |
