Fig. 1.

Similarities of MSD and MV model trajectories (see Materials and Methods). Shown are velocity profiles of minimum acceleration, jerk and snap (MA, MJ, MS), minimum variance second and third order (MV2, MV3 with third time constant = 10 msec); the descriptive Yarbus model (Y) is also shown for its similarity to MA. The time-origin is centered at peak velocity, which has been normalized to unity. Trajectories have been scaled in time so that velocity is 0.25 at ±0.5 time units, except in MV3 where a slight asymmetry precluded the alignment at +0.5 time units. For clarity, the order with which the profiles reach zero velocity has been mirrored in the legend. The MV profiles are based on an amplitude of 5° and duration 38 msec.