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. Author manuscript; available in PMC: 2014 Nov 7.
Published in final edited form as: Hum Mov Sci. 2013 Nov 7;32(5):10.1016/j.humov.2013.07.019. doi: 10.1016/j.humov.2013.07.019

Figure 2.

Figure 2

A ball throwing task example (John & Cusumano, 2007). (A) Schematic representation of the task, the goal of which is to hit the target; the body state is x = (θ,ω), so Db = 2, and the goal-level error is e, so Dg = 1. (B) A typical GEM for the task (gray line), and ±10% error contours (black lines) in the execution variable space. The GEM is the set 𝒢 containing all values of x that satisfy Eq. (2), giving trajectories that exactly hit the target. Angular variables are displayed in radians. The circle is for later comparison with Fig. 3.