Well, I guess this would be construed as the disturbance:
"During the tests, the bodies were placed in seats that moved with speeds up to 9 mph before being stopped in an effort to simulate a rear-end collision. Scientists observed how the bodies' vertebrae, upper bodies and backs moved."
Problematically, reading that paragraph is one of the funny parts of this. I don't know why exactly but it seems to be the way it's described. That seems to be the criteria for what I find curiously entertaining here...
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