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bsence of visual guidance.Inertial motions may be defined in terms of acceleration and jerk, the time-derivative of acceleration. We investigated the relative contributions of these characteristics to the perceived intensity of motions. Participants were seated on a high-fidelity motion platform, and presented with 25 above-threshold 1 s forward (surge) motions that had acceleration values ranging between 0.5 and 2.5 [Formula see text] and jerks between 20 and 60 [Formula see text], in five steps each. Participants performed two tasks a magnitude estimation