How does the subjective operational biases hit the steering law?

Steering law describes human motor behaviour based on trajectory tasks, such as drawing and writing. Current studies on steering tasks focus on effect of system factors (i.e., path width and amplitude) on the movement time and its related applications. We attempted to conduct a series of experiments to further explore the effect of different operational biases (bias speed or accuracy) on steering completion time and standard deviation for two steering shapes, i.e., a straight steering task and a circular steering task, and then verified that the steering law did not hold when the operational biases were introduced.