to decompose movement into three parts— acceleration, deceleration, and
correction. The correction is needed to accommodate target tolerance,
which is analogous to target width in the familiar 2- D case. Deng et al. were
able to develop regression models that were similar to those introduced by
Fitts and later researchers that were based on three variables: distance to
target, target tolerance, and object size. Object size played a critical role
in the acceleration phase and correction phase, but not in the deceleration
phase. Smaller objects required longer movement times to position. The
use of ...
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