Figure 3
From: Evaluation of head orientation and neck muscle EMG signals as three-dimensional command sources
Example of a single user’s performance from an identical starting location across command sources. The left column (A, C, & E) shows the user signals and resulting end-point position. The highlighted band across the middle of the plots represents the target width (changing color and becoming wider for emphasis when the arm end-point is inside the target space). The right column (B, D, & F) illustrates the end-point traces through the 3D workspace. Note that most of the motions are sequential, with few diagonal motions.