Fig. 4.

Performance metrics. Evaluation of the different metrics for a typical trial. An example of shoulder protraction trial is indicated in this figure in order to explain each metric. Subjects, starting from the rest position, are instructed by a message on the screen to execute a shoulder protraction. Movement onset initiates when decoder starts predicting the motion-classes. Motion selection time is defined as the interval between movement onset and decoder output which corresponds to the desired motion-class. Motion completion time is the time duration between movement onset and the final configuration of the virtual arm corresponding to the requested movement. Classification accuracy is the decoding accuracy throughout the trial