Figure 5.

Illustration of the effect upon decision boundaries and joint synergies activation distributions of the removal of noise correlations in task discrimination. Decoding the four out-center motor tasks (T5-T6-T7-T8) using synergies' S1–S3 activation coefficients taking into account correlations (A) or after removing them (B). For a given trial to be decoded, the activation coefficients of the synergies are represented as a point in the 2-dimensional space. The color of each point indicates the actual task which this trial corresponds to. The quadratic discriminant algorithm has divided the space into four regions, one for each motor task. The trial is assigned to the task indicated by the color of the region on which the point lies.